Composite Quasar Spectra From the Sloan Digital Sky Survey

Abstract

We have created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS). The quasar sample spans a redshift range of 0.044 <= z <= 4.789, and an absolute r' magnitude range of -18.0 to -26.5. The median composite covers a rest wavelength range from 800 - 8555A, and reaches a peak signal-to-noise ratio of over 300 per 1A resolution element in the rest frame. We have identified over 80 emission line features in the spectrum. Emission line peak velocity shifts of the broad permitted and semi-forbidden lines are strongly correlated with ionization energy, as previously suggested, but we find that the narrow forbidden lines are also shifted by amounts which are strongly correlated with ionization energy. The magnitude of the forbidden line shifts is < 100 km/s, compared to shifts of up to 550 km/s for some of the permitted and semi-forbidden lines. At wavelengths longer than the Ly-a emission, the continuum of the geometric mean composite is well-fit by two power-laws, with a break at approximately 5000A. The frequency power law index, alpha_nu, is -0.44 from 1300 - 5000A, and -2.45 redward of about 5000A. The abrupt change in slope can be accounted for partly by host galaxy contamination at low redshift. Stellar absorption lines, including higher-order Balmer lines, seen in the composites suggest that young or intermediate age stars make a significant contribution to the light of the host galaxies. An electronic table of the median quasar template is available.

40 pages, including 11 postscript figures, accepted by AJ; for the full version of table 1, see: ftp://sdss.fnal.gov/pub/danvb/qsocomposite/sdss_qso_median.tab1

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• A survey of luminous high-redshift quasars with SDSS and WISE. I. target selection and optical spectroscopy
• The correlation of line strength with luminosity and redshift from composite QSO spectra
• Optically Visible Post-AGB Stars, Post-RGB Stars and Young Stellar Objects in the Large Magellanic Cloud
• The UVES Spectral Quasar Absorption Database (SQUAD) Data Release 1: The first 10 million seconds
• Polar Outflows in Six Broad Absorption Line Quasars
• Subaru Mid-infrared Imaging of the Quadruple Lenses PG1115+080 and B1422+231: Limits on Substructure Lensing
• The X-ray properties of $z>6$ quasars: no evident evolution of accretion physics in the first Gyr of the Universe
• WFI J2026-4536 and WFI J2033-4723: Two New Quadruple Gravitational Lenses
• The Faint End of the z=5 Quasar Luminosity Function from the CFHTLS
• Supermassive Black Hole Binary Candidates from the Pan-STARRS1 Medium Deep Survey
• On the jet properties of the gamma-ray loud active galactic nuclei
• Light Curves from an MHD Simulation of a Black Hole Accretion Disk
• The X-ray to [Ne V]3426 flux ratio: discovering heavily obscured AGN in the distant Universe
• A Population of X-ray Weak Quasars: PHL 1811 Analogs at High Redshift
• Extremely metal-poor gas at a redshift of 7
• The relation between black hole mass and velocity dispersion at z~0.37
• The X-ray luminosity function of Active Galactic Nuclei in the redshift interval z=3-5
• Gaia Data Release 3: The extragalactic content
• X-ray Lighthouses of the High-Redshift Universe. II. Further Snapshot Observations of the Most Luminous z>4 Quasars with Chandra
• X-ray Detected AGN in SDSS Dwarf Galaxies
• Dust-reddening and gravitational lensing of SDSS QSOs due to foreground damped Lyman-alpha systems
• A Multiwavelength Study of the Relativistic Tidal Disruption Candidate Sw J2058+05 at Late Times
• Lyman alpha emitting galaxies at 0.2 < z < 0.35 from GALEX spectroscopy
• Improving Damped Random Walk parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
• Search for Supermassive Black Hole Binaries in the Sloan Digital Sky Survey Spectroscopic Sample
• First discoveries of z~6 quasars with the Kilo Degree Survey and VISTA Kilo-Degree Infrared Galaxy survey
• Detection of the 2175ÅExtinction Feature at z=0.83
• The History and Morphology of Helium Reionization
• A dormant, overmassive black hole in the early Universe
• A microlensing study of the accretion disc in the quasar MG 0414+0534
• A comprehensive and uniform sample of broad-line active galactic nuclei from the SDSS DR7
• How Much Mass do Supermassive Black Holes Eat in their Old Age?
• Cosmological parameters sigma_8, the baryon density, and the UV background intensity from a calibrated measurement of H I Lyman-alpha absorption at z = 1.9
• Does the fine-structure constant vary with cosmological epoch?
• Constraints on the Star Formation Rate in Active Galaxies
• The X-ray Energy Dependence of the Relation between Optical and X-ray Emission in Quasars
• Extended Lyman alpha emission around bright quasars
• Gamma-Ray Bursts versus Quasars: Lyman-alpha Signatures of Reionization versus Cosmological Infall
• A feature at z ~ 3.2 in the evolution of the Ly-alpha forest optical depth
• Robust Machine Learning Applied to Astronomical Datasets III: Probabilistic Photometric Redshifts for Galaxies and Quasars in the SDSS and GALEX
• The first blazar observed at z>6
• The Color Variability of Quasars
• An Empirical Calibration of the Completeness of the SDSS Quasar Survey
• Spitzer IRS spectroscopy of 3CR radio galaxies and quasars: Testing the unified schemes
• ImpZ: a new photometric redshift code for galaxies and quasars
• The Formation of the First Massive Black Holes
• The Origin of the Intrinsic Scatter in the Relation Between Black Hole Mass and Bulge Luminosity for Nearby Active Galaxies
• The 31 Deg${}^2$ Release of the Stripe 82 X-ray Survey: The Point Source Catalog
• A connection between extremely strong Damped Lyman-alpha Systems and Lyman-alpha Emitting Galaxies at small impact parameters
• Very High Redshift X-ray Selected AGN in the Chandra Deep Field-North
• The Chandra Multiwavelength Project: Optical Followup of Serendipitous Chandra Sources
• Spitzer Observations of Young Red Quasars
• Quantifying the AGN-driven outflows in ULIRGs (QUADROS) I: VLT/Xshooter observations of 9 nearby objects
• Weak Hard X-ray Emission from Broad Absorption Line Quasars: Evidence for Intrinsic X-ray Weakness
• Two bright z > 6 quasars from VST ATLAS and a new method of optical plus mid-infra-red colour selection
• XMM-Newton observations of the Narrow-Line Seyfert 1 galaxy Mrk 335 in an historical low X-ray flux state
• Selection effects in the black hole-bulge relation and its evolution
• The HST/ACS+WFC3 Survey for Lyman Limit Systems II: Science
• Diffuse molecular gas at high redshift: Detection of CO molecules and the 2175 Å dust feature at z=1.64
• First Discoveries of z>6 Quasars with the DECam Legacy Survey and UKIRT Hemisphere Survey
• The faint end of the QSO luminosity function at z=3
• A Bar Fuels a Super-Massive Black Hole?: Host Galaxies of Narrow-Line Seyfert 1 Galaxies
• X-ray and Multiwavelength Insights into the Nature of Weak Emission-Line Quasars at Low Redshift
• Predicting QSO Continua in the Ly Alpha Forest
• IGM Constraints from the SDSS-III/BOSS DR9 Ly-alpha Forest Flux Probability Distribution Function
• Application of Stochastic Modeling to Analysis of Photometric Reverberation Mapping Data
• Spectral variability of quasars from multi-epoch photometric data in the Sloan Digital Sky Survey Stripe 82
• The LSST DESC DC2 Simulated Sky Survey
• Lyman-alpha Damping Wing Constraints on Inhomogeneous Reionization
• Spectral Energy Distributions of Type 1 AGN in the COSMOS Survey I - The XMM-COSMOS Sample
• Evolution in the Black Hole - Galaxy Scaling Relations and the Duty Cycle of Nuclear Activity in Star-Forming Galaxies
• Early star formation traced by the highest redshift quasars
• Implications for unified schemes from the quasar fraction and emission-line luminosities in radio-selected samples
• BLR Physical Conditions in Extreme Population A Quasars: a Method to Estimate Central Black Hole Mass at High Redshift
• An Ultraviolet Spectrum of the Tidal Disruption Flare ASASSN-14li
• A population of highly energetic transient events in the centres of active galaxies
• Powerful flares from recoiling black holes in quasars
• A survey of luminous high-redshift quasars with SDSS and WISE II. the bright end of the quasar luminosity function at z ~ 5
• The Effects of Disc Winds on the Spectrum and Black Hole Growth Rate of Active Galactic Nuclei
• Dust-Corrected Colors Reveal Bimodality in AGN Host Galaxy Colors at z~1
• Monitoring AGNs with Hβ Asymmetry. I. First Results: Velocity-resolved Reverberation Mapping
• RUBIES: JWST/NIRSpec Confirmation of an Infrared-luminous, Broad-line Little Red Dot with an Ionized Outflow
• Double Lobed Radio Quasars from the Sloan Digital Sky Survey
• Shock Breakout in Type II Plateau Supernovae: Prospects for High Redshift Supernova Surveys
• Deep HeII and CIV Spectroscopy of a Giant Lyman alpha Nebula: Dense Compact Gas Clumps in the Circumgalactic Medium of a z~2 Quasar
• Rest-frame Optical Properties of Luminous 1.5<z<3.5 Quasars: the Hbeta-[OIII] Region
• Discovery of a Perseus-like cloud in the early Universe: HI-to-H2 transition, carbon monoxide and small dust grains at zabs=2.53 towards the quasar J0000+0048
• The imprint of inhomogeneous HeII reionization on the HI and HeII Ly-alpha forest
• The Quasar-frame Velocity Distribution of Narrow CIV Absorbers
• Luminosity-Dependent Quasar Lifetimes: Reconciling the Optical and X-ray Quasar Luminosity Functions
• Molecular gas in QSO host galaxies at z>5
• Chandra and XMM-Newton observations of the first quasars: X-rays from the age of cosmic enlightenment
• Identifying galaxies, quasars, and stars with machine learning: A new catalogue of classifications for 111 million SDSS sources without spectra
• A Combined Optical and X-ray Study of Unobscured Type 1 AGN. II. Relation Between X-ray Emission and Optical Spectra
• A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of $z>6.5$ Quasars Using JWST
• A Large Number of z > 6 Galaxies around a QSO at z = 6.43: Evidence for a Protocluster?
• The Civ line width distribution for quasars and its implications for broad-line region dynamics and virial mass estimation
• The Sloan Digital Sky Survey Reverberation Mapping Project: Rapid CIV Broad Absorption Line Variability
• Constraining the UV emissivity of AGN throughout cosmic time via X-ray surveys
• Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies
• Massive Compact Galaxies with High-Velocity Outflows: Morphological Analysis and Constraints on AGN Activity
• A Relation Between Supermassive Black Hole Mass and Quasar Metallicity?
• Quasars probing intermediate redshift star-forming galaxies
• The Ultraviolet Spectroscopic Evolution of the Low-Luminosity Tidal Disruption Event iPTF16fnl
• Mean-flux Regulated PCA Continuum Fitting of SDSS Lyman-alpha Forest Spectra
• GALEX far-UV color selection of UV-bright high-redshift quasars
• Detections of the 2175 ÅDust Feature at 1.4z 1.5 from the Sloan Digital Sky Survey
• An enhanced rate of tidal disruptions in the centrally overdense E+A galaxy NGC 3156
• The Optical - Infrared Colors of CORALS QSOs: Searching for Dust Reddening Associated With High Redshift Damped Lyman Alpha Systems
• High-Redshift QSOs in the SWIRE Survey and the z~3 QSO Luminosity Function
• The host galaxies of X-ray selected Active Galactic Nuclei to z=2.5: Structure, star-formation and their relationships from CANDELS and Herschel/PACS
• The Chandra XBootes Survey - III: Optical and Near-IR Counterparts
• X-ray Properties of Intermediate-mass Black Holes in Active Galaxies. III. Spectral Energy Distribution and Possible Evidence for Intrinsically X-ray-weak AGNs
• Mining for Dust in Type 1 Quasars
• Rest-frame Optical Spectra and Black Hole Masses of 3<z<6 Quasars
• Radiation Pressure Confinement - I. Ionized Gas in the ISM of AGN Hosts
• Near-ultraviolet Spectroscopy of Star-forming Galaxies from eBOSS: Signatures of Ubiquitous Galactic-scale Outflows
• Detection of the 2175Å~ extinction feature and 21-cm absorption in two MgII systems at z~1.3
• Obscured AGN at z~1 from the zCOSMOS-Bright Survey I. Selection and Optical Properties of a [Ne v]-selected sample
• QSFit: Automatic analysis of optical AGN spectra
• Extinction Curves of Lensing Galaxies out to z=1
• The Faint End of the Quasar Luminosity Function at $z\sim 5$ from the Subaru Hyper Suprime-Cam Survey
• The Transverse Proximity Effect: A Probe to the Environment, Anisotropy, and Megayear Variability of QSOs
• Faint AGN and the Ionizing Background
• Weak Hard X-ray Emission from Two Broad Absorption Line Quasars Observed with NuSTAR: Compton-thick Absorption or Intrinsic X-ray Weakness?
• New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5$
• Constraints on Reionization and Source Properties from the Absorption Spectra of z>6.2 Quasars
• Weak-Line Quasars at High Redshift: Extremely High Accretion Rates or Anemic Broad-Line Regions?
• Spectral Properties From Lyman-alpha to H-alpha For An Essentially Complete Sample of Quasars I: Data
• Ultraviolet and X-ray variability of active galactic nuclei with Swift
• The Curious Case of ASASSN-20hx: A Slowly-Evolving, UV and X-ray Luminous, Ambiguous Nuclear Transient
• Modeling the Dust Properties of z ~ 6 Quasars with ART^2 -- All-wavelength Radiative Transfer with Adaptive Refinement Tree
• Correlation between Galaxy Mergers and Luminous AGN
• A panchromatic view of AGN
• Low-z MgII Broad Absorption-Line Quasars from the Sloan Digital Sky Survey
• Modelling type 1 quasar colours in the era of Rubin and Euclid
• CO-dark molecular gas at high redshift: very large H${}_2$ content and high pressure in a low metallicity damped Lyman-alpha system
• Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars
• A Spectroscopic Survey of Faint Quasars in the SDSS Deep Stripe: I. Preliminary Results from the Co-added Catalog
• Abundance Anomalies In Tidal Disruption Events
• Hot Dust Obscured Galaxies with Excess Blue Light: Dual AGN or Single AGN Under Extreme Conditions?
• Co-evolution of massive black holes and their host galaxies at high redshift: discrepancies from six cosmological simulations and the key role of JWST
• Are Most Low-Luminosity AGN Really Obscured?
• Time-evolution of ionization and heating around first stars and miniquasars
• The properties of the young stellar populations in powerful radio galaxies at low and intermediate redshifts
• The SDSS-DR5 Survey for Proximate Damped Lya Systems
• NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5
• A Systematic Search for Periodically Varying Quasars in Pan-STARRS1: An Extended Baseline Test in Medium Deep Survey Field MD09
• SDSS J0159+0105: A Radio-Quiet Quasar with a Centi-Parsec Supermassive Black Hole Binary Candidate
• Detection of Rest-frame Optical Lines from X-shooter Spectroscopy of Weak Emission Line Quasars
• Broad Absorption Line Quasars in the Early Data Release from the Sloan Digital Sky Survey
• D/H in a new Lyman limit quasar absorption system at z=3.256 towards PKS1937-1009
• Long-Term Optical Continuum Color Variability of Nearby Active Galactic Nuclei
• The unusual NIV]-emitter galaxy GDS J033218.92-275302.7: star formation or AGN-driven winds from a massive galaxy at z=5.56
• Galaxy Zoo: dust and molecular gas in early-type galaxies with prominent dust lanes
• Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event
• Exploratory Chandra Observations of the Three Highest Redshift Quasars Known
• The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program. III. Optical Spectroscopy
• Quasars as standard candles II: The non linear relation between UV and X-ray emission at high redshifts
• To TDE or not to TDE: The luminous transient ASASSN-18jd with TDE-like and AGN-like qualities
• The nature of proximate damped Lyman alpha systems
• The VIMOS Ultra-Deep Survey: evidence for AGN feedback in galaxies with CIII]-$\lambda$1908Å~emission 10.8 to 12.5 Gyr ago
• Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Hubble Space Telescope Discovers Double Quasars
• Spectroscopic Identification of Type 2 Quasars at Z < 1 in SDSS-III/BOSS
• Host Galaxies of Luminous Type 2 Quasars at z ~ 0.5
• The most luminous blue quasars at $3.0<z<3.3$. I. A tale of two X-ray populations
• No evidence for Population III stars or a Direct Collapse Black Hole in the z = 6.6 Lyman-$\alpha$ emitter 'CR7'
• On the Observational Difference Between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei
• X-Ray Properties of Narrow-Line Seyfert 1 Galaxies with Very Small Broad-Line Widths
• Measuring the properties of extragalactic dust and implications for the Hubble diagram
• The transverse proximity effect in the z ~ 2 Lyman-alpha forest suggests QSO episodic lifetimes of ~1 Myr
• First Spectroscopic Study of a Young Quasar
• Weak Emission Line Quasars in the Context of a Modified Baldwin Effect
• Imaging the redshifted 21-cm pattern around the first sources during the cosmic dawn using the SKA
• Supermassive Black Hole Mass Estimates Using Sloan Digital Sky Survey Quasar Spectra at 0.7 < z < 2
• Hot Dust Clouds with Pure Graphite Composition around Type-I Active Galactic Nuclei
• X-ray Properties of Intermediate-Mass Black Holes in Active Galaxies. II. X-ray-Bright Accretion and Possible Evidence for Slim Disks
• Dramatic X-ray Spectral Variability of the Broad Absorption Line Quasar PG2112+059
• Accretion Disk Temperatures and Continuum Colors in QSOs
• Understanding Broad Mg II Variability in Quasars with Photoionization: Implications for Reverberation Mapping and Changing-Look Quasars
• A New Method for Measuring Extragalactic Distances
• The Discovery of Three New z>5 Quasars in the AGN and Galaxy Evolution Survey
• Bolometric luminosity black-hole growth time and slim accretion discs in active galactic nuclei
• Constraints on the merging channel of massive galaxies since z~1
• Galaxies probing galaxies: cool halo gas from a z = 0.47 post-starburst galaxy
• Multi-band light curves from eccentric accreting supermassive black hole binaries
• The Stacked Lyman-Alpha Emission Profile from the Circum-Galactic Medium of z~2 Quasars
• The X-Ray Variability of a Large, Serendipitous Sample of Spectroscopic Quasars
• Broad Absorption Line Quasars in the Sloan Digital Sky Survey with VLA-FIRST Radio Detections
• The Nature of Optically Dull Active Galactic Nuclei in COSMOS
• QSO Absorption Lines from QSOs
• Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
• No evidence for enhanced [OIII] 88um emission in a z~6 quasar compared to its companion starbursting galaxy
• On the structure and energetics of quasar broad absorption-line outflows
• Little Red Dots: Rapidly Growing Black Holes Reddened by Extended Dusty Flows
• The Chandra Deep Field South/GOODS survey. Optically faint X-ray sources
• Spectral Signature of Cosmological Infall of Gas Around the First Quasars
• Star formation history, dust attenuation and extragalactic background light
• The Evolution of Chemical Abundance in Quasar Broad Line Region
• LLAMA: The $M_{BH}$ - ${\sigma }_{\star }$ Relation of the most luminous local AGNs
• The Most Massive Active Black-Holes at z~1.5-3.5 Have High Spins and Radiative Efficiencies
• Obscured AGN at 1.5 < z < 3.0 from the zCOSMOS-deep Survey I. Properties of the emitting gas in the Narrow Line Region
• The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars
• X-ray Insights into the Nature of Weak Emission-Line Quasars at High Redshift
• Partial coverage of the Broad Line Region of Q1232+082 by an intervening H2-bearing cloud
• 21-cm signal from cosmic dawn - II: Imprints of the light-cone effects
• The Magellanic Quasars Survey. III. Spectroscopic Confirmation of 758 AGNs Behind the Magellanic Clouds
• The First High Redshift Quasar from Pan-STARRS
• SDSSJ2222+2745 A Gravitationally Lensed Sextuple Quasar with Maximum Image Separation of 15.1" Discovered in the Sloan Giant Arcs Survey
• Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
• Simulations of the OzDES AGN Reverberation Mapping Project
• Stellar Photometric Structures of the Host Galaxies of Nearby Type 1 Active Galactic Nuclei
• Limiting the dimming of distant type Ia supernovae
• The large area KX quasar catalogue: I. Analysis of the photometric redshift selection and the complete quasar catalogue
• Bayesian Single-Epoch Photometric Classification of Supernovae
• Connecting the X-ray properties of weak-line and typical quasars: testing for a geometrically thick accretion disk
• Performance of the Quasar Spectral Templates for the Dark Energy Spectroscopic Instrument
• The near-to-mid infrared spectrum of quasars
• Coexistence of Gravitationally Bound and Radiation Driven CIV Emission Line Regions in Active Galactic Nuclei
• A Study of Gravitational Lens Chromaticity using Ground-based Narrow Band Photometry
• The mass-metallicity relation of SDSS quasars
• The color excess of quasars with intervening DLA systems- Analysis of the SDSS data release five
• Optical/near-infrared selection of red QSOs: Evidence for steep extinction curves towards galactic centers?
• A fast ionised wind in a Star Forming-Quasar system at z~1.5 resolved through Adaptive Optics assisted near-infrared data
• Witnessing galaxy assembly in an extended z~3 structure
• Multi-messenger Time-domain Signatures Of Supermassive Black Hole Binaries
• The red blazar PMN J2345-1555 becomes blue
• High-redshift galaxies and black holes in the eyes of JWST: a population synthesis model from infrared to X-rays
• Correlations of Quasar Optical Spectra with Radio Morphology
• Comment on the Black Hole Recoil Candidate Quasar SDSS J092712.65+294344.0
• Emission line widths and QSO black hole mass estimates from the 2dF QSO Redshift Survey
• Multiwavelength Observations of Radio-quiet Quasars with Weak Emission Lines
• Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16
• Distinguishing Tidal Disruption Events from Impostors
• Evidence of a tidal disruption event in GSN 069 from the abnormal carbon and nitrogen abundance ratio
• Probing the faint end of the quasar luminosity function at z ~ 4 in the COSMOS field
• Stratified disc wind models for the AGN broad-line region: ultraviolet, optical and X-ray properties
• Molecular hydrogen in the z = 2.66 damped Lyman-alpha absorber toward Q J0643-5041
• A simple test for the existence of two accretion modes in Active Galactic Nuclei
• The Complete Ultraviolet Spectrum of the Archetypal "Wind-Dominated" Quasar Mrk~231: Absorption and Emission from a High-Speed Dusty Nuclear Outflow
• Searching for mid-IR obscured AGN in the CDF-N
• Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission
• Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey
• The evolution of HI and CIV quasar absorption line systems at 1.9 < z < 3.2
• CIV Black Hole Mass Measurements with the Australian Dark Energy Survey (OzDES)
• Molecular hydrogen absorption systems in Sloan Digital Sky Survey
• No Redshift Evolution in the Broad Line Region Metallicity up to z=7.54: Deep NIR Spectroscopy of ULAS J1342+0928
• XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars
• High metal content of highly accreting quasars
• A Constraint on the Gravitational Lensing Magnification and Age of the Redshift z=6.28 Quasar SDSS 1030+0524
• A comparison of quasar emission reconstruction techniques for $z\ge 5.0$ Lyman-$\alpha$ and Lyman-$\beta$ transmission
• The Pan-STARRS1 z>5.6 quasar survey II: Discovery of 55 Quasars at 5.6<z<6.5
• Metallicities, dust and molecular content of a QSO-Damped Lyman-α system reaching log N (H i) = 22: An analog to GRB-DLAs
• Zooming into the broad line region of the gravitationally lensed quasar Q2237+0305 = the Einstein Cross: III. Determination of the size and structure of the CIV and CIII] emitting regions using microlensing
• The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?
• Exploratory Chandra Observations of the Highest-Redshift Quasars: X-rays from the Dawn of the Modern Universe
• Detection of 21-cm, H2 and Deuterium absorption at z>3 along the line-of-sight to J1337+3152
• The Radio Properties of Type 2 Quasars
• The MUSE view of He 2-10: no AGN ionization but a sparkling starburst
• The CIV Baldwin effect in QSOs from Seventh Data Release of the Sloan Digital Sky Survey
• The UV Properties of SDSS Selected Quasars
• Super-Eddington QSO RX J0439.6-5311. II. Multi-wavelength Constraints on the Global Structure of the Accretion Flow
• No excess of bright galaxies around the redshift 7.1 quasar ULAS J1120+0641
• Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps
• Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization
• A Search for Lyman alpha Emitters at Redshift 3.7
• Long-term monitoring of the archetype Seyfert galaxy MCG-6-30-15: X-ray, optical and near-IR variability of the corona, disc and torus
• Boötes-HiZELS: an optical to near-infrared survey of emission-line galaxies at $\mathbf{z}=0.4-4.7$
• Acceleration and Substructure Constraints in a Quasar Outflow
• Redshifted 21cm Signatures Around the Highest Redshift Quasars
• Gravitational Lensing Statistics in Universes Dominated by Dark Energy
• The Host Galaxy and Rapidly Evolving Broad-line Region in the Changing-look Active Galactic Nucleus 1ES 1927+654
• The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: the 4th and 5th Data Release
• Probing the Reionization History Using the Spectra of High-Redshift Sources
• X-ray lighthouses of the high-redshift Universe. Probing the most luminous z>4 Palomar Digital Sky Survey Quasars with Chandra
• AGN host galaxies at redshift z~0.7: peculiar or not?
• The VIMOS VLT Deep Survey: the faint type-1 AGN sample
• Search for cold gas in strong MgII absorbers at 0.5<z<1.5: nature and evolution of 21-cm absorbers
• Luminosity-dependent unification of Active Galactic Nuclei and the X-ray Baldwin effect
• Super- and sub-Eddington accreting massive black holes: A comparison of slim and thin accretion discs through study of the spectral energy distribution
• Optical Spectropolarimetry of Quasi-Stellar Objects Discovered by the Two-Micron All Sky Survey
• Evidence for Cold-stream to Hot-accretion Transition as Traced by Lyα Emission from Groups and Clusters at 2 < z < 3.3
• GALEX observations of quasar variability in the ultraviolet
• An X-ray and Multiwavelength Survey of Highly Radio-Loud Quasars at z > 4: Jet-Linked Emission in the Brightest Radio Beacons of the Early Universe
• The Connection between Ultraviolet and X-ray Outflows in AGN: the case of PDS 456
• Statistical Detection of the HeII Transverse Proximity Effect: Evidence for Sustained Quasar Activity for $>$25 Million Years
• A quasar reddened by a sub-parsec sized, metal-rich and dusty cloud in a damped Lyman-alpha absorber at z=2.13
• Line-driven radiative outflows in luminous quasars
• A Deep Narrowband Imaging Search for CIV and He II Emission from Ly$\alpha$ Blobs
• Three intervening galaxy absorbers towards GRB060418: faint and dusty?
• The narrow-line region of narrow-line and broad-line type 1 AGN I. A zone of avoidance in density
• The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey
• Photometric Reverberation Mapping of the Broad Emission Line Region in Quasars
• Re-examining the case for neutral gas near the redshift 7 quasar ULAS J1120+0641
• Detection of chromatic microlensing in Q 2237+0305 A
• The Composite Spectrum of BOSS Quasars Selected for Studies of the Lyman-alpha Forest
• Inhomogeneous Helium Reionization and the Equation of State of the Intergalactic Medium
• The Incidence of X-ray selected AGN in Nearby Galaxies
• Constraining properties of dusty environments by infrared variability
• The Faint End of the Quasar Luminosity Function at z~4
• Ultraviolet and optical properties of Narrow-Line Seyfert 1 galaxies
• The chemical properties of low-redshift QSOs
• Extinction curve template for intrinsically reddened quasars
• STIS ultraviolet/optical spectroscopy of `warm' ultraluminous infrared galaxies
• Discovery of 16 New z ~ 5.5 Quasars : Filling in the Redshift Gap of Quasar Color Selection
• The Largest Blueshifts of [O III] emission line in Two Narrow-Line Quasars
• SDSS J102623.61+254259.5: the second most distant blazar at z=5.3
• Identification of SDSSJ141324.27+530527.0 as A New "Changing-Look" Quasar with a "Turn-on" Transition
• Statistical Properties of Multi-epoch Spectral Variability of SDSS Stripe82 Quasars
• Evidence for the Thermal Sunyaev-Zel'dovich Effect Associated with Quasar Feedback
• Two more, bright, z > 6 quasars from VST ATLAS and WISE
• Time Delay of MgII Emission Response for the Luminous Quasar HE 0435-4312: Towards Application of High-Accretor Radius-Luminosity Relation in Cosmology
• The HELLAS2XMM survey: XI. Unveiling the nature of X-ray Bright Optically Normal Galaxies
• First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). I. Photometric properties
• The final SDSS-IV/SPIDERS X-ray point source spectroscopic catalogue
• The Baldwin effect in the narrow emission lines of AGNs
• The Surprising Absence of Absorption in the Far-Ultraviolet Spectrum of Mrk 231
• Identification of Outflows and Candidate Dual Active Galactic Nuclei in SDSS Quasars at z=0.8-1.6
• On the link between associated MgII absorbers and star formation in quasar hosts
• Modelling the cosmic spectral energy distribution and extragalactic background light over all time
• Calibration and Limitations of the Mg II line-based Black Hole Masses
• Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
• Using [Ne V]/[Ne III] to Understand the Nature of Extreme-Ionization Galaxies
• Are red 2MASS QSOs young?
• Herschel Survey of the Palomar-Green QSOs at Low Redshift
• Lyman continuum leaking AGN in the SSA22 field
• Chandra Observations of Radio-Loud Quasars at z > 4: X-rays from the Radio Beacons of the Early Universe
• The Properties of Post-Starburst Quasars Based on Optical Spectroscopy
• A New H I Survey of Active Galaxies
• A Comprehensive Study of Broad Absorption Line Quasars: I. Prevalence of HeI* Absorption Line Multiplets in Low-Ionization Objects
• HD molecules at high redshift: The absorption system at z=2.3377 towards Q 1232+082
• A Uniformly Selected Sample of Low-Mass Black Holes in Seyfert 1 Galaxies. II. The SDSS DR7 Sample
• Multi-Epoch Observations of Extremely High-Velocity Emergent Broad Absorption
• The Line-of-Sight Proximity Effect and the Mass of Quasar Host Halos
• Synchronized Co-evolution between Supermassive Black Holes and Galaxies Over the Last Seven Billion Years as Revealed by the Hyper Suprime-Cam
• NIR spectroscopy of SDSS J0303-0019: a low luminosity, high Eddington ratio quasar at z~6
• X-ray spectroscopic survey of highly-accreting AGN
• Discovery of a Radio-Selected z ~ 6 Quasar
• Discovery of A Faint Quasar at z~6 and Implications for Cosmic Reionization
• Simultaneous Ultraviolet and Optical Emission-line Profiles of Quasars: Implications for Black Hole Mass Determination
• The Shocking Power Sources of LINERs
• How Do Galaxies trace a large scale structure?: A case study around a massive protocluster at $z=3.13$
• Average Properties of a Large Sample of z_abs ~ z_em associated Mg II Absorption Line Systems
• Spectral classification and composites of galaxies in LAMOST DR4
• The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon
• Broadband Intensity Tomography: Spectral Tagging of the Cosmic UV Background
• The Sloan Digital Sky Survey Reverberation Mapping Project: Post-Starburst Signatures in Quasar Host Galaxies at z < 1
• The Ionized Absorber and Nuclear Environment of IRAS 13349+2438: Multi-wavelength insights from coordinated Chandra HETGS, HST STIS, HET, and Spitzer IRS
• Infrared emission of $z\sim 6$ galaxies: AGN imprints
• An Investigation into the Effects of Luminosity on the Mid-Infrared Spectral Energy Distributions of Radio-Quiet Quasars
• The Long-Term X-Ray Variability of Broad Absorption Line Quasars
• An ultra-luminous quasar at z=5.363 with a ten billion solar mass black hole and a Metal-Rich DLA at z~5
• The evolution of host mass and black hole mass in QSOs from the 2dF QSO Redshift Survey
• Optical Images and Source Catalog of AKARI North Ecliptic Pole Wide Survey Field
• Molecular gas and star formation in an absorption-selected galaxy: Hitting the bull's eye at z = 2.46
• Hidden Starbursts and Active Galactic Nuclei at 0<z<4 from the Herschel-VVDS-CFHTLS-D1 Field: Inferences on Coevolution and Feedback
• A glance at the host galaxy of high-redshift quasars using strong damped Lyman-alpha systems as coronagraphs
• Hubble Space Telescope Imaging of Post-Starburst Quasars
• Towards Detecting The 2175-Å Dust Feature Associated With Strong High Redshift Mg ßII Absorption Lines
• Probing the Origins of the CIV and Fe Kalpha Baldwin Effect
• Flat-Spectrum Radio Quasars from SDSS DR3 Quasar Catalogue
• A large sample of Kohonen-selected SDSS quasars with weak emission lines: selection effects and statistical properties
• The Magellanic Quasars Survey. II. Confirmation of 144 New Active Galactic Nuclei Behind the Southern Edge of the Large Magellanic Cloud
• Black hole mass estimates in quasars - A comparative analysis of high- and low-ionization lines
• The Nature of Transition Blazars
• The Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Two and Three
• A New Iron Emission Template for Active Galactic Nuclei. I. Optical Template for the H$\beta$ region
• Metallicity in Quasar Broad Line Regions at Redshift $\sim$ 6
• A Census of Broad-Line Active Galactic Nuclei in Nearby Galaxies: Coeval Star Formation and Rapid Black Hole Growth
• Radio Detection of VIK J2318$-$3113, the Most Distant Radio-Loud Quasar ($z$=6.44)
• The space density of z>4 blazars
• Ultraviolet variability of quasars: dependence on the accretion rate
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine
• Evidence for Short $\sim 1$ Myr Lifetimes from the He II Proximity Zones of $z\sim 4$ Quasars
• Cosmic Evolution of Star Formation In SDSS Quasar Hosts Since z=1
• The Correlation between X-ray and UV Properties of BAL QSOs
• Exploratory X-ray Monitoring of Luminous Radio-Quiet Quasars at High Redshift: Initial Results
• X-ray properties of z>4 blazars
• The Spectral Energy Distributions of Active Galactic Nuclei
• High Redshift Standard Candles: Predicted Cosmological Constraints
• The Age of Discovery with the James Webb: Excavating the Spectral Signatures of the First Massive Black Holes
• Anomalously Steep Reddening Law in Quasars: An Exceptional Example Observed in IRAS14026+4341
• The Spectral Energy Distributions of Active Galactic Nuclei
• Constraints on the faint end of the quasar luminosity function at z~5 in the COSMOS field
• Chandra Observations of 12 Luminous Red Quasars
• The Case for Optically-Thick High Velocity Broad Line Region Gas in Active Galactic Nuclei
• Blazar candidates beyond redshift 4 observed with GROND
• JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST
• Constraining the dynamical importance of hot gas and radiation pressure in quasar outflows using emission line ratios
• Understanding AGN-Host Connection in Partially Obscured Active Galactic Nuclei. Part I: The Nature of AGN+HII Composites
• Nitrogen Enriched Quasars in the Sloan Digital Sky Survey First Data Release
• Star formation in luminous quasar host galaxies at z=1-2
• The Probability Distribution of the Lya transmitted flux from a sample of SDSS quasars
• How to constrain mass and spin of supermassive black holes through their disk emission
• Optical and Near-Infrared Spectroscopy of a High-Redshift, Hard X-ray Emitting Spiral Galaxy
• Outflow and hot dust emission in broad absorption line quasars
• Discovery of the first heavily obscured QSO candidate at $z>6$ in a close galaxy pair
• Discovery of an Optically-Faint Quasar at z=5.70 and Implications for the Faint End of the Quasar Luminosity Function
• Cold gas and a Milky Way-type 2175 Å bump in a metal-rich and highly depleted absorption system
• Large 21 cm signals from AGN-dominated reionization
• The Black Hole Mass - Stellar Velocity Dispersion Relationship for Quasars in the Sloan Digital Sky Survey Data Release 7
• SDSS J114657.79+403708.6: the third most distant blazar at z=5.0
• Rapid Black Hole Growth at the Dawn of the Universe: A Super-Eddington Quasar at z=6.6
• Extreme quasars at high redshift
• SDSS J211852.96-073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy
• Galaxy And Mass Assembly (GAMA): The environments of high- and low- excitation radio galaxies
• The White Dwarf Population in NGC 1039 (M34) and the White Dwarf Initial-Final Mass Relation
• Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745
• Astrometric Redshifts for Quasars
• The ensemble photometric variability of over $10^5$ quasars in the Dark Energy Camera Legacy Survey and the Sloan Digital Sky Survey
• Quasar Microlensing Variability Studies Favor Shallow Accretion Disk Temperature Profiles
• The Magellanic Quasars Survey. I. Doubling the Number of Known AGNs Behind the Small Magellanic Cloud
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: A Catalogue of Strong Galaxy-Galaxy Lens Candidates
• The Large Sky Area Multi-Object Fiber Spectroscopic Telescope Quasar Survey: Quasar Properties from First Data Release
• The Sloan Digital Sky Survey Reverberation Mapping Project: Systematic Investigations of Short-Timescale CIV Broad Absorption Line Variability
• Carbon and Nitrogen Abundance Ratio In the Broad Line Region of Tidal Disruption Events
• Candidate Isolated Neutron Stars and Other Optically Blank X-ray Fields Identified from the ROSAT All-Sky and Sloan Digital Sky Surveys
• AGN-driven helium reionization and the incidence of extended HeIII regions at redshift z>3
• The High A(V) Quasar Survey: Reddened quasi-stellar objects selected from optical/near-infrared photometry - II
• Giant scattering cones in obscured quasars
• Spectral Variability of Quasars in the Sloan Digital Sky Survey. II: The C IV Line
• Extinction in Star-Forming Disk Galaxies from Inclination-Dependent Composite Spectra
• Two-Component Structure of the Hbeta Broad-Line Region in Quasars. I. Evidence from Spectral Principal Component Analysis
• XMM-Newton Observations of High Redshift Quasars
• A High Resolution Atlas of Composite SDSS Galaxy Spectra
• Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj
• The Calan-Yale Deep Extragalactic Research (CYDER) Survey: Optical Properties and Deep Spectroscopy of Serendipitous X-ray Sources
• The Near and Mid-infrared photometric properties of known redshift $z\ge 5$ Quasars
• Radio-Selected Quasars in the Sloan Digital Sky Survey
• The Diverse Morphology, Stellar Population, and Black Hole Scaling Relations of the Host Galaxies of Nearby Quasars
• Radiative Efficiency of Disk Accretion in Individual SDSS QSOs
• A new search for distant radio galaxies in the Southern hemisphere -- III. Optical spectroscopy and analysis of the MRCR--SUMSS sample
• Star formation and black hole growth at z=4.8
• SDSS J013127.34-032100.1: a candidate blazar with a 11 billion solar mass black hole at $z$=5.18
• CIV Emission and the Ultraviolet through X-ray Spectral Energy Distribution of Radio-Quiet Quasars
• J-PLUS: Unveiling the brightest-end of the Lyα luminosity function at 2.0<z<3.3 over 1000 deg^2
• Microlensing and Intrinsic Variability of the Broad Emission Lines of Lensed Quasars
• A quasar-galaxy merger at $z\sim 6.2$: black hole mass and quasar properties from the NIRSpec spectrum
• Finding Quasars behind the Galactic Plane. I. Candidate Selections with Transfer Learning
• An Extreme X-ray Variability Event of a Weak-Line Quasar
• Determining the Lensing Fraction of SDSS Quasars: Methods and Results from the EDR
• Hubble Space Telescope Wide Field Camera 3 Observations of Escaping Lyman Continuum Radiation from Galaxies and Weak AGN at Redshifts $z$$\simeq$2.3-4.1
• Is there a UV/X-ray connection in IRAS 13224-3809?
• Quasar Photometric Redshifts and Candidate Selection: A New Algorithm Based on Optical and Mid-Infrared Photometric Data
• 21-cm absorption from galaxies at z ~ 0.3
• HI content, metallicities and spin temperatures of damped and sub-damped Lyman alpha systems in the redshift desert (0.6 < z < 1.7)
• High redshift AGNs and HI reionisation: limits from the unresolved X-ray background
• Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
• High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multi-Epoch Spectroscopy
• An HST/WFPC2 Snapshot Survey of 2MASS-Selected Red QSOs
• Chemical Abundance of z~6 Quasar Broad-Line Regions in the XQR-30 Sample
• The Optical and Near-Infrared Properties of 2837 Quasars in the UKIRT Infrared Deep Sky Survey (UKIDSS)
• A Photometric and Spectroscopic Search for White Dwarfs in the Open Clusters NGC 6633 and NGC 7063
• Neutral atomic-carbon QSO absorption-line systems at z>1.5: Sample selection, HI content, reddening, and 2175 A extinction feature
• Spectral Evolution in High Redshift Quasars from the Final BOSS Sample
• The Spectra of IceCube Neutrino (SIN) candidate sources -- II. Source Characterisation
• Structure of the Accretion Disk in the Lensed Quasar Q2237+0305 from Multi-Epoch and Multi-Wavelength Narrow Band Photometry
• Close companions to two high-redshift quasars
• Constraints on the temperature inhomogeneity in quasar accretion discs from the ultraviolet-optical spectral variability
• Redshifts of Emission Line Objects in the Hubble Ultra Deep Field
• Challenging the AGN scenario for JWST/NIRSpec LRD and non-LRD broad H$\alpha$ emitters in light of non-detection of NIRCam photometric variability and X-ray
• Multiple Regression Analysis of the Variable Component in the Near-Infrared Region for Type 1 AGN MCG+08-11-011
• The Infrared Medium-deep Survey. VIII. Quasar Luminosity Function at $z\sim 5$
• Spectroscopy of extended Lyα envelopes around z=4.5 quasars
• The optical variability of SDSS quasars from multi-epoch spectroscopy. II. color variation
• Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN-14ko
• Bridging Star-Forming Galaxy and AGN Ultraviolet Luminosity Functions at $z=4$ with the SHELA Wide-Field Survey
• The peculiar emission line spectra of core-Extremely Red BOSS Quasars at $z\sim$2-3: orientation and/or evolution?
• Measuring large-scale structure with quasars in narrow-band filter surveys
• Characterisation of Sloan Digital Sky Survey Stellar Photometry
• Ultraviolet Continuum Color Variability of Luminous Sloan Digital Sky Survey QSOs
• 21-cm signature of the first sources in the Universe: Prospects of detection with SKA
• An Infrared Comparison of Type-1 and Type-2 Quasars
• A Lyα blob and zabs {\approx} zem damped Lyα absorber in the dark matter halo of the binary quasar Q 0151+048
• The Covering Factor of Warm Dust in Quasars: View from WISE All-Sky Data Release
• Fast Inflow Directly Feeding Black Hole Accretion Disk in Quasars
• SDSS 0956+5128: A Broad-line Quasar with Extreme Velocity Offsets
• SDSS J1130+0058 an X-shaped Radio Source With Double-Peaked Low-Ionization Emission Lines: A binary Black Hole System?
• HI 21-cm absorption survey of quasar-galaxy pairs: Distribution of cold gas around z<0.4 galaxies
• HST imaging of four gravitationally lensed quasars
• A Metal-Strong and Dust-Rich Damped \lya Absorption System toward the Quasar SDSS J115705.52+615521.7
• Quasars as high-redshift standard candles
• Evidence for a population of beamed radio intermediate quasars
• Unusual high-redshift radio BAL quasar 1624+3758
• On the Connection Between Metal Absorbers and Quasar Nebulae
• The Earliest Epoch of Reionisation in the Standard $\Lambda$CDM Model
• A Chandra Search for X-Ray Jets in Redshift 6 Quasars
• HST-COS Observations of AGNs. III. Spectral Constraints in the Lyman Continuum from Composite COS/G140L Data
• The Redshifted Hydrogen Balmer and Metastable He I Absorption Line System in Mini-FeLoBAL Quasar SDSS J112526.12+002901.3: A Parsec Scale Accretion Inflow?
• An excess of damped Lyman alpha galaxies near QSOs
• Simulating Wide-Field Quasar Surveys from the Optical to Near-Infrared
• Quasar UV/X-ray relation luminosity distances are shorter than reverberation-measured radius-luminosity relation luminosity distances
• Fe II Emission in AGN: The Role of Total and Gas-Phase Iron Abundance
• VHE gamma-ray detection of FSRQ QSO B1420+326 and modeling of its enhanced broadband state in 2020
• Extreme Gaseous Outflows in Radio-Loud Narrow-Line Seyfert 1 Galaxies
• Deep rest-frame far-UV spectroscopy of the giant Lyman-alpha emitter 'Himiko'
• An FeLoBAL Binary Quasar
• Herschel observed Stripe 82 quasars and their host galaxies: connections between the AGN activity and the host galaxy star formation
• Emergence and Variability of Broad Absorption Line Quasar Outflows
• The host galaxies of FeLoBAL quasars at z$\sim$0.9 are not dominated by recent major mergers
• On inferring extinction laws in z~6 quasars as signatures of supernova dust
• MHD Disc Winds and Linewidth Distributions
• A Quasar Catalog with Simultaneous UV, Optical and X-ray Observations by Swift
• Metal Absorption Systems in Spectra of Pairs of QSOs
• Seoul National University Bright Quasar Survey in Optical (SNUQSO). II. Discovery of 40 Bright Quasars Near the Galactic Plane
• The dust content of damped Lyman-alpha systems in the Sloan Digital Sky Survey
• Discovery of an Extreme MeV Blazar with the Swift Burst Alert Telescope
• The Extremely Luminous Quasar Survey in the Pan-STARRS 1 Footprint (PS-ELQS)
• COSMOS 5921+0638: Characterization and analysis of a new strong gravitationally lensed AGN
• Radiation pressure on dust explains the Low Ionized Broad Emission Lines in Active Galactic Nuclei
• Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z$\approx 5.5$
• Post-Starburst Quasars: Bridging the Gap Between Post-Starburst Galaxies and Quasars
• The He II Post-Reionization Epoch: HST/COS Observations of the Quasar HS1700+6416
• A Quasar-Galaxy Mixing Diagram: Quasar Spectral Energy Distribution Shapes in the Optical to Near-Infrared
• First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). II. Spectroscopic properties
• Spectroscopy of moderately high-redshift RCS-1 clusters
• Physical Properties of Luminous Dust Poor Quasars
• A forward modelling approach to AGN variability -- Method description and early applications
• The HELLAS2XMM Survey. XII. The infrared/sub-millimeter view of an X-ray selected Type 2 quasar at z=2
• Exploratory Study of the X-Ray Properties of Quasars With Intrinsic Narrow Absorption Lines
• Clustering of Lyman-alpha Emitters Around Quasars at $z\sim 4$
• The Sightline to Q2343-BX415: Clues to Galaxy Formation in a Quasar Environment
• The near-IR properties and continuum shapes of high redshift quasars from the Sloan Digital Sky Survey
• Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz
• A self-consistent 3D model of fluctuations in the helium-ionizing background
• Evaluating Lya Emission as a Tracer of the Largest Cosmic Structure at z~2.47
• Modeling accretion disk emission with generalized temperature profile and its effect on AGN spectral energy distribution
• Proximate Molecular Quasar Absorbers: Excess of damped H2 systems at zabs~zQSO in SDSS DR14
• A polar+equatorial wind model for broad absorption line quasars: I. Fitting the C IV BAL profiles
• On R-W1 as A Diagnostic to Discover Obscured Active Galactic Nuclei in Wide-Area X-ray Surveys
• A multi-epoch spectroscopic study of the BAL quasar APM 08279+5255: I. C IV absorption variability
• Steep Hard-X-ray Spectra Indicate Extremely High Accretion Rates in Weak Emission-Line Quasars
• The Ultraviolet-to-Mid-Infrared Spectral Energy Distribution of Weak Emission Line Quasars
• Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within $10^4$ years
• The QUEST-La Silla AGN Variability Survey
• Survey of Extremely High-velocity Outflows in Sloan Digital Sky Survey Quasars
• SDSS J131339.98+515128.3: A new gravitationally lensed quasar selected based on near-infrared excess
• The Redshift of a Lensing Galaxy in PMN J0134-0931
• Implications from the optical to UV flux ratio of FeII emission in quasars
• Narrow absorption line variability in repeat quasar observations from the Sloan Digital Sky Survey
• A Synoptic, Multiwavelength Analysis of a Large Quasar Sample
• The soft X-ray properties of quasars in the Sloan Digital Sky Survey
• A new method to measure the virial factors in the reverberation mapping of AGNs
• The QSO proximity effect at redshift <z>=2.6 with the FLO approach
• Powerful Activity in the Bright Ages. I. A Visible/IR Survey of High Redshift 3C Radio Galaxies and Quasars
• SED-dependent Galactic Extinction Prescription for Euclid and Future Cosmological Surveys
• The VMC Survey - VI. Quasars behind the Magellanic system
• The nature of X-ray absorbed QSOs
• Searching for $\gamma$-ray signature in WHSP blazars: Fermi-LAT detection of 150 excess signal in the 0.3-500 GeV band
• Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter
• Classification and redshift estimation by principal component analysis
• Obscured and powerful AGN and starburst activities at z~3.5
• The evolution of the heaviest super-massive black-holes in jetted AGNs
• Probing the M-sigma Relation in the Non-Local Universe Using Red QSOs
• X-ray spectroscopy of the z=6.4 quasar J1148+5251
• Discovery of intergalactic bridges connecting two faint $z\sim 3$ quasars
• Spectral properties of Type Ia supernovae up to z~0.3
• Metallicity and Quasar Outflows
• Where is the fuzz? Undetected Lyman alpha nebulae around QSOs at z~2.3
• A Candidate Kiloparsec-scale Quasar Pair at $z=5.66$
• SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-ray Variability
• AT 2021loi: A Bowen Fluorescence Flare with a Rebrightening Episode, Occurring in a Previously-Known AGN
• Broad Absorption Line Variability in Radio-Loud Quasars
• Outflow in Overlooked Luminous Quasar: Subaru Observations of AKARI J1757+5907
• A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - V. Neutral and Ionised Phase Metallicities
• The AGN nature of three INTEGRAL sources: IGR J18249-3243, IGR J19443+2117 and IGR J22292+6647
• A Chandra X-ray study of the interacting binaries in the old open cluster NGC6791
• Implications of an updated ultraviolet background for the ionization mechanisms of intervening Ne VIII absorbers
• A universal average spectral energy distribution for quasars from optical to extreme ultraviolet
• CatNorth: An Improved Gaia DR3 Quasar Candidate Catalog with Pan-STARRS1 and CatWISE
• The NuSTAR Extragalactic Survey: Average broad-band X-ray spectral properties of the NuSTAR detected AGN
• Quasar spectral variability from the XMM-Newton serendipitous source catalogue
• The Ultraviolet/optical variability of steep-spectrum radio quasars: the change in accretion rate ?
• J004457+4123 (Sharov 21): not a remarkable nova in M31 but a background quasar with a spectacular UV flare
• Fe III emission in quasars: evidence for a dense turbulent medium
• Discovery of the luminous X-ray ignition eRASSt J234402.9$-$352640; I. Tidal disruption event or a rapid increase in accretion in an active galactic nucleus?
• A Chandra Survey of the X-ray Properties of Broad Absorption Line Radio-Loud Quasars
• Detection of the Intermediate-width Emission Line Region in Quasar OI 287 with the Broad Emission Line Region Obscured by the Dusty Torus
• Imaging Polarization of the Blue-Excess Hot Dust-Obscured Galaxy WISE J011601.41-050504.0
• A Census of Quasar-Intrinsic Absorption in the Hubble Space Telescope Archive: Systems from High Resolution Echelle Spectra
• Modeling Quasar UV/Optical Variability with the Corona-heated Accretion-disk Reprocessing (CHAR) Model
• The radio loud narrow-line quasar SDSSJ172206.03+565451.6
• Strong lensing selection effects
• CMB-induced radio quenching of high-redshift jetted AGNs with highly magnetic hotspots
• Photoionization-driven Absorption Lines Variability in Balmer Absorption Line Quasar LBQS 1206+1052
• The Host Galaxy of the Quasar HE 0450-2958
• Placing High-Redshift Quasars in Perspective: a Catalog of Spectroscopic Properties from the Gemini Near Infrared Spectrograph -- Distant Quasar Survey
• Revealing HI gas in emission and absorption on pc to kpc scales in a galaxy at z ~ 0.017
• Gravitational lens system SDSS J1339+1310: microlensing factory and time delay
• Reaching the Peak of the quasar spectral energy distribution - II. Exploring the accretion disc, dusty torus and host galaxy
• The spectral and environment properties of $z\sim 2.0-2.5$ quasar pairs
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
• The properties of the brightest Lyman alpha emitters at z~5.7
• Systematic Redshift of the Fe III UV Lines in Quasars. Measuring Supermassive Black Hole Masses under the Gravitational Redshift Hypothesis
• A Dusty Mg~II absorber Associated with the Quasar SDSS J003545.13+011441.2
• Spectroscopy of QUBRICS quasar candidates: 1672 new redshifts and a Golden Sample for the Sandage Test of the Redshift Drift
• Color-redshift Relations and Photometric Redshift Estimations of Quasars in Large Sky Surveys
• An Extragalactic Spectroscopic Survey of the SSA22 Field
• Are High-Redshift Quasars Blurry?
• Probing the nature of the massive black hole binary candidate SDSS J1536+0441
• Extreme Variability Quasars in Their Various States. I: The sample selection and composite SDSS spectra
• Discovery of H alpha absorption in the unusual broad absorption line quasar SDSS J083942.11+380526.3
• Radio-mode feedback in local AGNs: dependence on the central black hole parameters
• C IV BAL disappearance in a large SDSS QSO sample
• The X-ray Properties of Active Galactic Nuclei with Double-Peaked Balmer Lines
• A Steady-State Spectral Model For Electron Acceleration And Cooling In Blazar Jets: Application To 3C 279
• Recurring tidal disruption events a decade apart in IRAS F01004-2237
• Broad Balmer Absorption Line Variability: Evidence of Gas Transverse Motion in the QSO SDSS J125942.80+121312.6
• The WISSH quasars project XI. The mean Spectral Energy Distribution and Bolometric Corrections of the most luminous quasars
• NeIII/OII as an oxygen abundance indicator in the HII regions and HII galaxies
• Tracking the year-to-year variation in the spectral energy distribution of the Narrow-line Seyfert 1 Galaxy Mrk335
• SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
• Dating individual quasars with the HeII proximity effect
• NuSTAR Observations of Intrinsically X-ray Weak Quasar Candidates: An Obscuration-Only Scenario
• On the spin-temperature evolution during the epoch of reionization
• Unshifted Metastable He I* Mini-Broad Absorption Line System in the Narrow Line Type 1 Quasar SDSS J080248.18$+$551328.9
• Chandra and Magellan/FIRE follow-up observations of PSO167-13: an X-ray weak QSO at $z=6.515$
• The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys
• SDSS J092712.64+294344.0: recoiling black hole or merging galaxies?
• Into the Lyα jungle: exploring the circumgalactic medium of galaxies at z ~ 4-5 with MUSE
• Host Galaxies of z=4 Quasars
• Partial covering of emission regions of Q 0528-250 by intervening H${}_2$ clouds
• Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at $|b|<20°$
• Mid-infrared microlensing of accretion disc and dusty torus in quasars: effects on flux ratio anomalies
• On the relation between hard X-ray photon index versus accretion rate for super-Eddington accreting quasars
• Microlensing of Quasar UV Iron Emission
• Extinction properties of lensing galaxies
• The line-of-sight proximity effect in individual quasar spectra
• Incidence of HI 21-cm absorption in strong FeII systems at $0.5<z<1.5$
• Modeling photometric reverberation mapping data for the next generation of big data surveys. Quasar accretion disks sizes with the LSST
• Testing the relativistic Doppler boost hypothesis for the binary candidate quasar PG1302-102 with multi-band Swift data
• Variability of Low-ionization Broad Absorption Line Quasars Based on Multi-epoch Spectra from The Sloan Digital Sky Survey
• The Relativistic Jet Orientation and Host Galaxy of the Peculiar Blazar PKS 1413+135
• The Extremely Luminous Quasar Survey (ELQS) in the Sloan Digital Sky Survey footprint. II. The North Galactic Cap Sample
• The black hole mass of the $z=2.805$ multiply imaged quasar SDSS J2222+2745 from velocity-resolved time lags of the CIV emission line
• Cosmic Near-infrared Background Tomography with SPHEREx Using Galaxy Cross-correlations
• A quasar hiding behind two dusty absorbers. Quantifying the selection bias of metal-rich, damped Lyman-alpha absorption systems
• Correlated X-ray/UV/optical emission and short term variability in a Seyfert 1 galaxy NGC 4593
• New Radio-Loud QSOs at the end of the Re-ionisation Epoch
• MUSE adaptive-optics spectroscopy confirms dual active galactic nuclei and strongly lensed systems at sub-arcsec separation
• Variability of QSOs with variable regions in broad absorption troughs from the Sloan Digital Sky Survey
• WISE detections of known QSOs at redshifts greater than six
• He II optical depth and UV escape fraction of galaxies
• The Nature of LoBAL QSOs: I. SEDs and mid-infrared spectral properties
• Galaxies with Background QSOs, I: A Search for Strong Galactic H-alpha Lines
• Testing the fragmentation limit in the Upper Sco association
• Feeding the Accretion Disk from the Dusty Torus in a Reddened Quasar
• A statistical study of the optical spectral variability in gamma-ray blazars
• Spectroscopic classification, variability and SED of the Fermi-detected CSS 3C 286: the radio-loudest NLS1 galaxy?
• The Physical Conditions of the Intrinsic N V Narrow Absorption Line Systems of Three Quasars
• The rapid transition from star-formation to AGN dominated rest-frame UV light at z ~ 4
• Upper boundaries of AGN regions in optical diagnostic diagrams
• The Blueshift Of Civ Broad Emission Line In Qsos
• Chemical enrichment and accretion of nitrogen-loud quasars
• Observational Constraints on Correlated Star Formation and Active Galactic Nuclei in Late-Stage Galaxy Mergers
• Black hole accretion discs and screened scalar hair
• A new method to obtain the Broad Line Region size of high redshift quasars
• 3D-HST Emission Line Galaxies at z ~ 2: Discrepancies in the Optical/UV Star Formation Rates
• The optical variability of SDSS quasars from multi-epoch spectroscopy: I. Results from 60 quasars with $\ge$ six-epoch spectra
• Spatially Resolving the Kinematics of the <100 μas Quasar Broad Line Region using Spectroastrometry
• The Formation and Evolution of the First Massive Black Holes
• An Apparent Redshift Dependence of Quasar Continuum: Implication for Cosmic Dust Extinction?
• Quasi-stellar objects in the ALHAMBRA survey. I. Photometric redshift accuracy based on a 23 optical-NIR filter photometry
• Chandra Observations of Red Sloan Digital Sky Survey Quasars
• The Host Galaxy and The Extended Emission-Line Region of The Radio Galaxy 3C 79
• The Reddest DR3 SDSS/XMM Quasars
• On the Emergence of Thousands of Absorption Lines in the Quasar PG1411+442: A Clumpy High-Column Density Outflow from the Broad Emission-Line Region?
• Far Infrared Luminosity Function of Local Star-forming Galaxies in the AKARI Deep Field South
• An extremely X--ray weak blazar at z=5
• The Infrared Medium-deep Survey. VI. Discovery of Faint Quasars at $z\sim 5$ with a Medium-band-based Approach
• Faint COSMOS AGN at z~3.3 - I. Black Hole Properties and Constraints on Early Black Hole Growth
• The Kinematics of Quasar Broad Emission Line Regions Using a Disk-wind Model
• The Binary Black Hole Model for Mrk 231 Bites the Dust
• Fossil Ionized Bubbles Around Dead Quasars During Reionization
• Optical spectral characterization of the gamma-ray blazars S4 0954+65, TXS 1515-273 and RX J0812.0+0237
• Higher prevalence of X-ray selected AGN in intermediate age galaxies up to z~1
• Spectral variability of FIRST bright QSOs with SDSS observations
• SED constraints on the highest-$z$ blazar jet: QSO J0906+6930
• The Frequency of Intrinsic X-ray Weakness Among Broad Absorption Line Quasars
• Multiwavelength Study of an X-ray Tidal Disruption Event Candidate in NGC 5092
• Measurement of The Broad Line Region Size in a Luminous MACHO Quasar
• A Chandra Snapshot Survey of Representative High-Redshift Radio-Loud Quasars from the Parkes-MIT-NRAO Sample
• New Constraints on the Quasar Broad Emission Line Region
• XMM-Newton Spectroscopy of the Highly Polarized and Luminous Broad Absorption Line Quasar CSO 755
• Irradiation of accretion discs in active galactic nuclei due to warm absorber
• High Dust Depletion in Two Intervening Quasar Absorption Line Systems with the 2175-Å Extinction Bump at $z\sim 1.4$
• The X-ray properties of typical high-redshift radio-loud quasars
• Dynamical evidence of the sub-parsec counter-rotating disc for a close binary of supermassive black holes in the nucleus of NGC 1068
• Electron Acceleration In Blazars: Application to the 3C 279 Flare on 2013 December 20
• Spectral Energy Distributions of Candidate Periodically-Variable Quasars: Testing the Binary Black Hole Hypothesis
• Outflow vs. Infall in Spiral Galaxies: Metal Absorption in the Halo of NGC 891
• Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS
• Probing Reionization with Quasar Spectra: the Impact of the Intrinsic Lyman-alpha Emission Line Shape Uncertainty
• The Spectral Energy Distributions of Red 2MASS AGN
• Active Galactic Nuclei with a Low-Metallicity Narrow-Line Region
• The Prevalence of Narrow Optical Fe II Emission Lines in Type 1 Active Galactic Nuclei
• Do broad absorption line quasars live in different environments from ordinary quasars?
• Accretion properties of X-ray AGN: Evidence for radiation-regulated obscuration with redshift-dependent host galaxy contribution
• The B3-VLA CSS sample. VIII: New optical identifications from the Sloan Digital Sky Survey. The ultraviolet-optical spectral energy distribution of the young radio sources
• Subaru high resolution spectroscopy of complex metal absorption lines of QSO HS1603+3820
• Gemini-South + FLAMINGOS Demonstration Science: Near-Infrared Spectroscopy of the z=5.77 Quasar SDSS J083643.85+005453.3
• Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models
• Discovery of merging twin quasars at z = 6.05
• Statistics of Quasars Multiply Imaged by Galaxy Clusters
• Black Hole - Bulge Relationship of Post-Starburst Quasars at z \sim 0.3
• Faint Blue Objects in the Hubble Deep Field South Revealed: White Dwarfs, Subdwarfs, and Quasars
• The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) I. Sample selection
• The Effect of Variability on the Estimation of Quasar Black Hole Masses
• A long look at the BALQSO LBQS 2212-1759 with XMM-Newton
• Rest-frame optical properties of luminous, radio-selected, broad absorption line quasars
• A Gravitationally Lensed Quasar Discovered in OGLE
• Discovery of strong Balmer line absorption in two luminous LoBAL quasars at z~1.5
• ELDAR, a new method to identify AGN in multi-filter surveys: the ALHAMBRA test-case
• Energy distribution of individual quasars from far-UV to X-rays: I. Intrinsic UV hardness and dust opacities
• Photometric Properties of the Most Massive High-Redshift Galaxies
• Discovery of Two Spectroscopically Peculiar, Low-Luminosity Quasars at z~4
• Relation between the variations in the MgII $\lambda 2798$ emission-line and the 3000 Å continuum
• Effect of extinction on quasar luminosity distances determined from UV and X-ray flux measurements
• SCUBA2 High Redshift Bright Quasar Survey: Far-infrared Properties and Weak-line Features
• Environmental effects on the growth of super massive black holes and AGN feedback
• A very bright i=16.44 quasar in the `redshift desert' discovered by LAMOST
• Near infrared and optical continuum emission region size measurements in the gravitationally lensed quasars Q0957+561 and SBS0909+532
• The Subarcsecond Mid-Infrared View of Local Active Galactic Nuclei. IV. The L- and M-band Imaging Atlas
• SDSSp J104433.04$-$012502.2 at $z=5.74$ is Gravitationally Magnified by an Intervening Galaxy
• High redshift Fermi blazars observed by GROND and Swift
• Powerful Radio-Loud Quasars are Triggered by Galaxy Mergers in the Cosmic Bright Ages
• Spectropolarimetric Evidence for Radiatively Inefficient Accretion in an Optically Dull Active Galaxy
• Discovery of a single faint AGN in a large sample of z>5 Lyman break galaxies
• Chemical abundances along the quasar main sequence
• Single-Epoch Black Hole Mass Estimators For Broad-Line Active Galactic Nuclei: Recalibrating Hbeta with A New Approach
• SALT long-slit spectroscopy of CTS C30.10: two-component Mg II line
• The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program: II. Optical Imaging
• A Rapid and Large-Amplitude X-ray Dimming Event in a z ~ 2.6 Radio-Quiet Quasar
• HST and LAMOST discover a dual active galactic nucleus in J0038+4128
• New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates
• Broad absorption line disappearance/emergence in multiple ions in a weak emission-line quasar
• The Cross-correlation of MgII Absorption and Galaxies in BOSS
• Fantastic Fits with fantasy of Active Galactic Nuclei Spectra -- Exploring the Fe II emission near the H$\alpha$ line
• Scary Barbie: An Extremely Energetic, Long-Duration Tidal Disruption Event Candidate Without a Detected Host Galaxy at z = 0.995
• Appearance vs Disappearance of broad absorption line troughs in quasars
• A Search for Nitrogen Enriched Quasars in the Sloan Digital Sky Survey Early Data Release
• Ensemble power spectral density of SDSS quasars in UV/optical bands
• MUSE-inspired view of the quasar Q2059-360, its Lyman alpha blob, and its neighborhood
• Vanishing Absorption and Blueshifted Emission in FeLoBAL Quasars
• The XMM-Newton Survey in the Marano Field I. The X-ray data and optical follow-up
• The Spectra of IceCube Neutrino (SIN) candidate sources -- V. Modeling and interpretation of multiwavelength and neutrino data
• The discovery of a type-II quasar at z = 1.65 with integral-field spectroscopy
• The most luminous blue quasars at 3.0<z<3.3. II. CIV/X-ray emission and accretion disc physics
• Investigation of the Gamma-ray Spectrum of CTA 102 During the Exceptional Flaring State in 2016-2017
• The spectra of IceCube Neutrino (SIN) candidate sources -- III. Optical spectroscopy and source characterization of the full sample
• Rapidly varying Mg II broad absorption line in SDSS J133356.02+001229.1
• Calibrating Milky Way dust extinction using cosmological sources
• No evidence of "gray" dust from composite quasar spectra
• SDSS J163459.82+204936.0: A Ringed Infrared-Luminous Quasar with Outflows in both Absorption and Emission Lines
• Discovery of Balmer Broad Absorption Lines in the Quasar LBQS 1206+1052
• A Lyman-alpha-only AGN from the Sloan Digital Sky Survey
• The Most Massive Active Galactic Nuclei at $1\lesssim z\lesssim 2$
• Dust Budget Crisis in Little Red Dots
• Variability and evolution of the optical polarization of a sample of gamma-ray blazars
• The Paschen Jump as a Diagnostic of the Diffuse Nebular Continuum Emission in Active Galactic Nuclei
• A Mote in Andromeda's Disk: a Misidentified Periodic AGN Behind M31
• Connecting Low- and High-Redshift Weak Emission-Line Quasars via HST Spectroscopy of Ly$\alpha$ Emission
• Introducing the Photometric Maximum Likelihood Method: Galaxy Luminosity Functions at z<1.2 in MUSYC-ECDFS
• ROXA J081009.9+384757.0: a $10^{47}$ erg/s blazar with hard X-ray synchrotron peak or a new type of radio loud AGN?
• Modelling the orientation of accretion disks in quasars using H-alpha emission
• The luminosity dependence of quasar UV continuum slope: dust extinction scenario
• Mid-Infrared Selected Quasars I: Virial Black Hole Mass and Eddington Ratios
• Galactic Winds across the Gas-Rich Merger Sequence: I. Highly Ionized N V and O VI Outflows in the QUEST Quasars
• Using the Properties of Broad Absorption Line Quasars to Illuminate Quasar Structure
• Interesting Features in the Combined GALEX and Sloan Color Diagrams of Solar-like Galactic Populations
• Estimators of Bolometric Luminosity and Black Hole Mass with Mid-infrared Continuum Luminosities for Dust-obscured Quasars: Prevalence of Dust-obscured SDSS Quasars
• The rest-frame UV-to-optical spectroscopy of APM 08279+5255 - BAL classification and black hole mass estimates
• The Infrared Medium-deep Survey. \Romannum{7}. Faint Quasars at $z\sim 5$ in the ELAIS-N1 Field
• Machine Learning applied to Multifrequency Data in Astrophysics: Blazar Classification
• Identification of AGN in the XMM-Newton X-ray survey of the SMC
• The X-ray warm absorber and nuclear obscuration in the Seyfert 1.8 galaxy ESO 113-G010
• Astronomical random numbers for quantum foundations experiments
• UNCOVERing the High-redshift AGN Population among Extreme UV Line Emitters
• A Multi-wavelength Analysis of Binary-AGN Candidate PSO J334.2028+01.4075
• Discovery and Follow-up of ASASSN-23bd (AT 2023clx): The Lowest Redshift and Least Luminous Tidal Disruption Event To Date
• Ionizing radiation from AGNs at z>3.3 with the Subaru Hyper Suprime-Cam Survey and the CFHT Large Area U-band Deep Survey (CLAUDS)
• Red AGN in XMM-Newton/SDSS fields
• Forward modeling the multiwavelength properties of Active Galactic Nuclei: application to X-ray and WISE mid-infrared samples
• The Metallicity of the Redshift 4.16 Quasar BR2248-1242
• Dust and gas obscuration in ELAIS Deep X-ray Survey reddened quasars
• Probing the disk-corona systems and broad line regions of changing-look quasars with X-ray and optical observations
• Looking at quasars through galaxies
• UV spectral diagnostics for low redshift quasars: estimating physical conditions and radius of the Broad Line Region
• A Chandra Look at Five of the Broadest Double-Peaked Balmer-Line Emitters
• Properties of X-ray selected Broad Absorption Line Quasars
• The relation between the optical spectral slope and the luminosity for 17 Palomar-Green QSOs
• The Sloan Digital Sky Survey Reverberation Mapping Project: Biases in z>1.46 Redshifts due to Quasar Diversity
• The X-ray Properties of Million Solar Mass Black Holes
• A Halo Occupation Interpretation Of Quasars At $z\sim 1.5$ Using Very Small Scale Clustering Information
• The warm outer layer of a Little Red Dot as the source of [Fe II] and collisional Balmer lines with scattering wings
• Prescriptions for Correcting Ultraviolet-Based Redshifts for Luminous Quasars at High Redshift
• The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn
• The Black Hole Mass - Galaxy Luminosity Relationship for Sloan Digital Sky Survey Quasars
• A young, dusty, compact radio source within a Ly|*alpha*| halo
• Medium-resolution Optical and Near-Infrared Spectral Atlas of 16 2MASS-selected NIR-red Active Galactic Nuclei at $z\sim 0.3$
• Host Dark Matter Halos of SDSS Red and Blue Quasars: No Significant Difference in Large-scale Environment
• UM 625 Revisited: Multiwavelength Study of A Seyfert 1 Galaxy with a Low-mass Black Hole
• The SDSS-V Black Hole Mapper Reverberation Mapping Project: Unusual Broad-Line Variability in a Luminous Quasar
• Near-infrared spectroscopy of a nitrogen-loud quasar SDSS J1707+6443
• The missing FeII bump in faint JWST AGN: possible evidence for metal-poor broad-line regions at early cosmic times
• Detecting the Highest Redshift (z > 8) QSOs in a Wide, Near Infrared Slitless Spectroscopic Survey
• Measuring Lensing Magnification of Quasars by Large Scale Structure using the Variability-Luminosity Relation
• On the emission lines in active galactic nuclei with relativistic jets
• Broad-band spectral energy distribution of 3000 Angstroem break quasars from the Sloan Digital Sky Survey
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• Active Galactic Nuclei Selected from GALEX Spectroscopy: The Ionizing Source Spectrum at z~1
• Mapping the low surface brightness Universe in the UV band with Lya emission from IGM filaments
• Photometric and spectroscopic evolution of the peculiar Type IIn SN 2012ab
• Gemini Near Infrared Spectrograph -- Distant Quasar Survey: Augmented Spectroscopic Catalog and a Prescription for Correcting UV-Based Quasar Redshifts
• Shedding New Light on Weak Emission-Line Quasars in the C${}_{\mathrm{IV}}$-H$\beta$ Parameter Space
• Wavelength-resolved reverberation mapping of intermediate redshift quasars HE 0413-4031 and HE 0435-4312: Dissecting Mg II, optical Fe II, and UV Fe II emission regions
• HI 21-cm absorption from $z\sim 0.35$ strong MgII absorbers
• GTC Observations of an Overdense Region of LAEs at z=6.5
• Discovery of a very Lyman-$\alpha$-luminous quasar at z=6.62
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• Extreme nature of four blue-excess dust-obscured galaxies revealed by optical spectroscopy
• The GALEX Time Domain Survey. II. Wavelength-Dependent Variability of Active Galactic Nuclei in the Pan-STARRS1 Medium Deep Survey
• The ESO UVES Advanced Data Products Quasar Sample-V. Identifying the Galaxy Counterpart to the sub-Damped Ly-alpha System towards Q2239-2949
• Polarization of Rayleigh scattered Lyα in active galactic nuclei
• On the Performance of Quasar Reverberation Mapping in the Era of Time-Domain Photometric Surveys
• A Tentative Size-Luminosity Relation for the Iron Emission-Line Region in Quasars
• The eROSITA Final Equatorial-Depth Survey (eFEDS): The first archetypal Quasar in the feedback phase discovered by eROSITA
• Spectroscopic QUasar Extractor and redshift (z) EstimatorSQUEzE I: Methodology
• High Redshift X-Ray Selected Quasars: CXOCY J125304.0-090737 joins the club
• Infrared Imaging of SDSS Quasars: Implications for the Quasar K correction
• SHELLQs. Bridging the Gap: JWST Unveils Obscured Quasars in the Most Luminous Galaxies at z > 6
• Quasar UV Luminosity Function at $3.5<z<5.0$ from SDSS Deep Imaging Data
• VLT near-infrared spectra of hard serendipitous Chandra sources
• The host galaxy of the z=2.4 radio-loud AGN MRC 0406-244 as seen by HST
• Photometric Redshift Biases from Galaxy Evolution
• A Little Red Dot at $\mathbf{z}=7.3$ within a Large Galaxy Overdensity
• Revisiting the Completeness and the Luminosity Function in High-Redshift Low-Luminosity Quasar Surveys
• X-rays from the radio-quiet quasar PG 1407+265: relativistic jet or accretion disc emission?
• Estimating Black Hole Masses in Hundreds of Quasars
• Diffuse emission in microlensed quasars and its implications for accretion-disk physics
• Black hole mass and spin estimates of the most distant quasars
• Host galaxies of luminous quasars: population synthesis of optical off-axis spectra
• Exploratory X-ray Monitoring of Luminous Radio-Quiet Quasars at High Redshift: No Evidence for Evolution in X-ray Variability
• GA-NIFS: The highly overdense system BR1202-0725 at z $\sim$ 4.7. A double AGN with fast outflows plus eight companion galaxies
• Ultraviolet and Optical Emission-line Outflows in the Heavily Obscured Quasar SDSS J000610.67+121501.2: At the Scale of the Dusty Torus and Beyond
• Reddening and He I* $\lambda 10830$ Absorption Lines in Three Narrow-line Seyfert 1 Galaxies
• Neural-network selection of high-redshift radio quasars, and the luminosity function at z~4
• Peculiar Broad Absorption Line Quasars found in DPOSS
• Quasars as standard candles VI: spectroscopic validation of the cosmological sample
• The Correlation Between Spectral Index And Accretion Rate For AGN
• CIV emission line properties and uncertainties in black hole mass estimates of z ~ 3.5 quasars
• Calibration of AGN Reverberation Distance Measurements
• Spiral Arms in Broad-line Regions of Active Galactic Nuclei. I. Reverberation and Differential Interferometric Signals of Tightly Wound Cases
• Multiwavelength Scrutiny of X-ray Sources in Dwarf Galaxies: ULXs versus AGN
• The incidence of AGN in galaxies with different stellar population ages
• Tracing the co-evolution path of super massive black holes and spheroids with AKARI-selected ultra-luminous IR galaxies at intermediate redshifts
• A Quasar Without Broad Lyman-alpha Emission
• An Effective Selection Method for Low-Mass Active Black Holes and First Spectroscopic Identification
• Investigating the nuclear properties of highly accreting active galactic nuclei with XMM-Newton
• A Test of Photometric Redshifts for X-ray Selected Sources
• uGMRT search for cold gas at z~1-1.4 towards red quasars
• VLT/SINFONI study of black hole growth in high redshift radio-loud quasars from the CARLA survey
• Probing spectral properties of radio-quiet quasars searched for optical microvariability
• The Asiago-ESO/RASS QSO Survey II. The Southern Sample
• The eROSITA Final Equatorial-Depth Survey (eFEDS): An X-ray bright, extremely luminous infrared galaxy at z = 1.87
• SDSS J1058+5443: A blue quasar does not have optical/NUV broad emission lines
• A slitless spectroscopic survey for quasars near quasars
• The 'Big Dipper': The nature of the extreme variability of the AGN SDSS J2232-0806
• Evolution of the Lyman-alpha Halos around High-Redshift Radio Galaxies
• Discovery of the Most-Distant Double-Peaked Emitter at z=1.369
• Outflow and metallicity in the broad-line region of low-redshift active galactic nuclei
• Spectroscopy of broad absorption line quasars at $3\lesssim z\lesssim 5$ -- I: evidence for quasar winds shaping broad/narrow emission line regions
• A powerful (and likely young) radio-loud quasar at z=5.3
• Statistical analysis of AlIII 1860 and CIII] 1909 emission lines as virial black hole mass estimators in quasars
• SDSS J154751.94+025550 with double-peaked broad Hβbut single-peaked broad Hα: a candidate for central binary black hole system?
• A Deeply Buried Narrow-Line Seyfert 1 Nucleus Uncovered in Scattered Light
• Concordance between observations and simulations in the evolution of the mass relation between supermassive black holes and their host galaxies
• AGN Broad Line Regions Scale with Bolometric Luminosity
• Wavelength Dependences of the Optical/UV and X-ray Luminosity Correlations of Quasars
• Magnetohydrodynamic DiscWinds and LineWidth Distributions.II
• A catalog of optical to X-ray spectral energy distributions of z~2 quasars observed with Swift. I: First results
• "Invisible AGN" I: Sample Selection and Optical/Near-IR Spectral Energy Distributions
• Constraints on the relative sizes of intervening Mg II-absorbing clouds and quasar emitting regions
• Circumgalactic Ly$\alpha$ emission around submillimeter-bright galaxies with different quasar contributions
• Spectroscopic Identification and Chemical Distribution of HII Regions in the Galactic Anti-center Area from LAMOST
• Proper Motion Objects in the Hubble Deep Field
• Optical spectroscopy of SDSS J004054.65-0915268: three possible scenarios for the classification. A z \sim 5 BL Lacertae, blue FSRQ or a weak emission line quasar
• Measuring time delays: I. Using a flux time series that is a linear combination of time-shifted light curves
• SCAT Uncovers ATLAS's First Tidal Disruption Event ATLAS18mlw: A Faint and Fast TDE in a Quiescent Balmer Strong Galaxy
• Determining the Locations of Dust Sources in FeLoBAL Quasars
• AstroSat/UVIT observations of IC4329A: Constraining the accretion disc inner radius
• High-ion absorption in the proximate damped Lyman-alpha system toward Q0841+129
• XMM-Newton spectra of hard spectrum Rosat AGN: X-ray absorption and optical reddening
• IRAS F13308+5946: A Possible Transition Phase From Type I ULIRG To Optical Quasar
• Radio galaxies in the 2SLAQ Luminous Red Galaxy survey: II. The stellar populations of radio-loud and radio-quiet LRGs
• A $1.4$ deg${}^2$ blind survey for CII], CIII] and CIV at $\mathbf{z}\sim 0.7-1.5$. II: luminosity functions and cosmic average line ratios
• Joint Survey Processing I: Compact oddballs in the COSMOS field -- low-luminosity Quasars at z > 6?
• Proximate molecular quasar absorbers: Chemical enrichment and kinematics of the neutral gas
• Role of Feedback in AGN-HOST Coevolution: A Study from Partially Obscured Active Galactic Nuclei
• Variability of broad absorption lines in a QSO SDSS J022844.09+000217.0 on multi-year timescales
• XMM-Newton reveals a Seyfert-like X-ray spectrum in the z=3.6 QSO B1422+231
• Characterizing Quasars in the Mid-infrared: High Signal-to-Noise Spectral Templates
• Insights Into AGN and Host Galaxy Co-evolution From Hard X-ray Emission
• UV Fe II emission model of HE 0413-4031 and its relation to broad-line time delays
• Supermassive Black Hole Masses in Type II Active Galactic Nuclei with Polarimetric Broad Emission Lines
• JADES -- The small blue bump in GN-z11: insights into the nuclear region of a galaxy at z=10.6
• Accretion disc-corona and jet emission from the radio-loud narrow-line Seyfert 1 galaxy RX J1633.3+4719
• Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multi-band surveys
• On the scattering enhancement of Nv1240 emission line of quasi-stellar objects
• The Circumgalactic Medium of Submillimeter Galaxies. II. Unobscured QSOs within Dusty Starbursts and QSO Sightlines with Impact Parameters below 100 Kiloparsec
• Milky Way dust extinction measured with QSOs
• AGN Triality of Triple Mergers: Multi-wavelength Classifications
• The eROSITA Final Equatorial Depth Survey (eFEDS): SDSS spectroscopic observations of X-ray sources
• Combined constraints on intergalactic dust from quasar colours and the soft X-ray background
• Testing the Completeness of the SDSS Colour Selection for Ultramassive, Slowly Spinning Black Holes
• Revealing Thermal Comptonization of accretion-disk photons in IC4329A with AstroSat
• The Infrared Counterparts of the Optically Unidentified CDF-S 1Ms Sources
• Black hole virial masses from single-epoch photometry: the miniJPAS test case
• The Optical Variability of SDSS Quasars from Multi-epoch Spectroscopy. III. A Sudden UV Cutoff in Quasar SDSS J2317+0005
• SDSS J222428.53+261423.2: unique emission lines properties unveil a sub-kiloparsec dual AGN candidate
• Discovery of Metastable He I* $\lambda$10830 Mini-broad Absorption Lines and Very Narrow Paschen $\alpha$ Emission Lines in the ULIRG Quasar IRAS F11119+3257
• On the optical counterparts of radio transients and variables
• An empirical approach to selecting the first growing black hole seeds with JWST/NIRCam
• The Host Galaxies of Hybrid Morphology Radio Sources
• Catalog of Candidates for Quasars at 3 < z < 5.5 Selected among X-Ray Sources from the 3XMM-DR4 Survey of the XMM-Newton Observatory
• Giga-z: A 100,000 Object Superconducting Spectrophotometer for LSST Follow-up
• Ultraviolet Spectral Evidence for Ansky as a Slowly Evolving Featureless Tidal Disruption Event with Quasiperiodic Eruptions
• A QSO plus host system lensed into a 6" Einstein ring by a low redshift galaxy
• A low-luminosity type-1 QSO sample; III. Optical spectroscopic properties and activity classification
• Composite spectra of quasars with different UV spectral index
• Evaluating and Improving the Redshifts of z>2.2 Quasars
• An unusual iron Lo-BAL quasar detected by ISOCAM
• A study of the 15 micron quasars in the ELAIS N1 and N2 fields
• Far-Ultraviolet Spectroscopy Of Active Galactic Nuclei With AstroSat/UVIT
• A candidate of binary black hole system in AGN with broad Balmer emission lines having quite different line widths
• Seyfert 1 Composite Spectrum using SDSS Legacy Survey Data
• Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
• Are quasars reliable standard candles?
• The star-formation rates of QSOs
• X-ray Luminosity Function of Quasars at 3<z<5 from XMM-Newton Serendipitous Survey Data
• Gemini Near Infrared Spectrograph - Distant Quasar Survey: Prescriptions for Calibrating UV-Based Estimates of Supermassive Black Hole Masses in High-Redshift Quasars
• A complete sample of LSP blazars fully described in $\gamma$-rays. New $\gamma$-ray detections and associations with Fermi-LAT
• The Nature of Luminous Quasars with Very Large C IV Equivalent Widths
• Unveiling the quasar main sequence: illuminating the complexity of active galactic nuclei and their evolution
• Modeling the Spectral Diversity of Quasars in the Sixteenth Data Release from the Sloan Digital Sky Survey
• The Flux Auto- and Cross-Correlation of the Lyman-alpha Forest. I. Spectroscopy of QSO Pairs with Arcminute Separations and Similar Redshifts
• A Systematic Analysis of Stellar Populations in the Host Galaxies of SDSS Type I QSOs
• Insights into Quasar UV Spectra Using Unsupervised Clustering Analysis
• A Panchromatic Catalog of Early-Type Galaxies at Intermediate Redshift in the Hubble Space Telescope Wide Field Camera 3 Early Release Science Field
• SkyMapper colours of Seyfert galaxies and Changing-Look AGN
• The Infrared Medium-deep Survey. IX. Discovery of Two New $z\sim 6$ Quasars and Space Density down to $M_{1450}\sim -23.5$ mag
• Bayesian Photometric Redshifts for Weak Lensing Applications
• Unresolved z~8 point sources and their impact on the bright end of the galaxy luminosity function
• The Southern 2MASS AGN Survey: spectroscopic follow-up with 6dF
• Modeling the unresolved NIR-MIR SEDs of local ($z<0.1$) QSOs
• A FIRST-APM-SDSS survey for high-redshift radio QSOs
• Photoreverberation mapping of quasars in the context of LSST observing strategies
• SALT long-slit spectroscopy of HE 0435-4312: fast displacement in the Mg II emission line
• The Mass Distribution of Quasars in Optical Time-domain Surveys
• First black hole mass estimation for the quadruple lensed system WGD2038-4008
• Rest-frame optical and far-infrared observations of extremely bright Lyman-break galaxy candidates at z ~ 2.5
• Near-Infrared Photometry of the High-Redshift Quasar RDJ030117+002025: Evidence for a Massive Starburst at z=5.5
• PSJ2107-1611: a new wide-separation, quadruply imaged lensed quasar with flux ratio anomalies
• Possible environmental quenching in an interacting little red dot pair at $z\sim 7$
• A Closer Look at Two of the Most Luminous Quasars in the Universe
• Determining Quasar Orientation
• Quasars with Anomalous Hβ Profiles I: Demographics
• Observational nonstationarity of AGN variability: The only way to go is down!
• Euclid preparation. Observational expectations for redshift z<7 active galactic nuclei in the Euclid Wide and Deep surveys
• Unveiling the Universe with Emerging Cosmological Probes
• Optical and near-infrared spectroscopy of quasars at $z>6.5$: public data release and composite spectrum
• Efficient Analysis Routines for Single and Double Peaked Type 2 AGN Spectra
• What is the nature of Little Red Dots and what is not, MIRI SMILES edition
• The story of Seyfert galaxy RE J2248-511: from intriguingly ultrasoft to unremarkably average
• PKS 0537-441: extended [O II] emission and a binary QSO?
• AstroSat view of spectral transition in the changing-look active galaxy NGC1566 during the declining phase of the 2018 outburst
• Spectropolarimetric measurements of hidden broad lines in nearby megamaser galaxies: a lack of clear evidence for a correlation between black hole masses and virial products
• Studying the Multi-frequency Angular Power Spectrum of the Cosmic Dawn 21-cm Signal
• Spectral variability studies in Active Galactic Nuclei: Exploring continuum and emission line regions in the age of LSST and JWST
• LBQS 0015+0239: A Binary Quasar with Small Angular Separation
• Very Large Array imaging rules out precessing radio jets in three DES$-$SDSS-selected candidate periodic quasars
• Detection of Iron Emission in the z = 5.74 QSO SDSSp J104433.04-012502.2
• BAL Outflows are common in Low Eddington Ratio AGN
• Optical Spectroscopy of Candidates for Quasars at 3<z<5.5 from the XMM-Newton X-ray survey. A distant X-ray Quasar at z=5.08
• Proving strong magnetic fields near to the central black hole in the quasar PG0043+039 via cyclotron lines
• X-ray selected BALQSOs
• A Peculiar Type~II QSO Identified via Broad-band Detection of Extreme Nebular Line Emission
• Constraints on black hole spins with a general relativistic accretion disk corona model
• Breaking the rules at $z\simeq$0.45: the rebel case of RBS 1055
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
• Tracing Quasar Narrow-Line Regions Across Redshift: A Library of High S/N Optical Spectra
• The near-infrared SED of blue quasars: what drives the evolution of the dusty torus?
• Revealing new high redshift quasar populations through Gaussian mixture model selection
• The possible detection of high redshift Type II QSOs in deep fields
• HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe
• Fading Light, Fierce Winds: JWST Snapshot of a Sub-Eddington Quasar at Cosmic Dawn
• An Intercomparison Study of Two Proximate Damped Ly$\alpha$ Systems with Residual Flux upon the Ly$\alpha$ Absorption Trough toward Quasars
• Euclid: The potential of slitless infrared spectroscopy: A z=5.4 quasar and new ultracool dwarfs
• Selection Effects in the SDSS Quasar Sample: The Filter Gap Footprint
• The miniJPAS & J-NEP surveys: Identification and characterization of the Ly$\alpha$ Emitter population and the Ly$\alpha$ Luminosity Function
• Spectroscopic study of the [OIII]$\lambda$5007 profile in Seyfert 1 galaxies
• An X-ray View of the Ambiguous Nuclear Transient AT2019pev
• The relationship between variable and polarized optical spectral components of luminous type 1 non-blazar quasars
• JWST Discovery of a High-Redshift Tidal Disruption Event Candidate in COSMOS-Web
• Probing the He II re-Ionization ERa via Absorbing C IV Historical Yield (HIERACHY) I: A Strong Outflow from a z~4.7 Quasar
• X-ray and Multiwavelength Insights into the Inner Structure of High-Luminosity Disc-Like Emitters
• Spectroscopic Identification of Faint White Dwarf Candidates in the Praesepe Open Star Cluster
• Emission line properties of the most luminous AGN in massive galaxies at intermediate redshifts
• 3D spectroscopy with GTC-MEGARA of the triple AGN candidate in SDSS J102700.40+174900.8
• Unveiling the monster heart: unbeamed properties of blazar 4C 71.07
• Sub-millimeter Detected z~2 Radio-quiet QSOs: Accurate Redshifts, Black Hole Masses, and Inflow/Outflow Velocities
• A weak Ly$\alpha$ halo for an extremely bright Little Red Dot: Indications of enshrouded SMBH growth
• The optical luminosity function of LOFAR radio-selected quasars at $1.4\le z\le 5.0$ in the NDWFS-Boötes field
• Investigating the Core Morphology-Seyfert Class relationship with Hubble Space Telescope Archival Images of local Seyfert galaxies
• Optical monitoring of the z=4.40 quasar Q 2203+292
• Periodic variability of the z=2.0 quasar QSO B1312+7837
• Quasars as high-redshift standard candles
• The probabilistic random forest applied to the QUBRICS survey: improving the selection of high-redshift quasars with synthetic data
• The Composite Spectral Energy Distribution of Quasars is Surprisingly Universal Since Cosmic Noon
• A survey for low luminosity quasars at redshift z~5
• A search for cosmological anisotropy using the Lyman alpha forest from SDSS quasar spectra
• SDSS-IV MaNGA: Identification and Multiwavelength Properties of Type-1 AGN in the DR15 sample
• The peculiar optical-UV X-ray spectra of the X-ray weak quasar PG 0043+039
• An X-ray Selected AGN at z=4.6 Discovered by the CYDER Survey
• Towards modelling Ghostly DLAs
• Understanding Lyman-alpha Nebulae at Low Redshift I: The Sizes, Powering, and Kinematics of "Green Bean" Galaxies
• Discovery of a z=0.65 Post-Starburst BAL Quasar in the DES Supernova Fields
• The PAU Survey: The quasar UV and Ly$\alpha$ luminosity functions at $2.7<z<5.3$
• AGN accretion disks as spatially resolved by polarimetry
• Detection of an H-alpha Emission Line on a Quasar, RX J1759.4+6638, at z=4.3 with AKARI
• Stochastic Absorption of the Light of Background Sources due to Intergalactic Neutral Hydrogen I. Testing different line-number evolution models via the cosmic flux decrement
• The quasar luminosity function at $z\sim 5$ via deep learning and Bayesian information criterion
• Black hole mass of a quiescent galaxy hosting a Type 1 AGN at z=2.09: Implications for black hole - galaxy co-evolution and AGN quenching at high redshift
• Quasars and their host galaxies
• A measure of cosmological distance using the \civ\ Baldwin effect in quasars
• A Catalog of Post-starburst Quasars from Sloan Digital Sky Survey Data Release 7
• Revealing the Warm and Hot Halo Baryons via Thomson Scattering of Quasar Light
• Inferences on relations between distant supermassive black holes and their hosts complemented by the galaxy fundamental plane
• Photometric Selection of type 1 Quasars in the XMM-LSS Field with Machine Learning and the Disk-Corona Connection
• Simple Stellar Population Modeling of Low S/N Galaxy Spectra and Quasar Host Galaxy Applications
• "Zombie" or active? An alternative explanation to the properties of star-forming galaxies at high redshift
• Environments around quasars at $z\sim$3 revealed by wide-field imaging with Subaru HSC and CFHT
• Characterization of the continuum and kinematical properties of nearby NLS1
• Rapidly accreting black hole of the Lyα-luminous quasar PSO J006.1240+39.2219
• Development of Hydrogen and Helium Proximity Zones around Quasars
• SDSS spectroscopy for blazars in the $Fermi$ LAT bright AGN sample
• XMM-Newton, Swift and ROSAT observations of LBQS 0102-2713
• Radio Scrutiny of the X-ray-Weak Tail of Low-Mass Active Galactic Nuclei: A Novel Signature of High-Eddington Accretion?
• Hillas meets Eddington: The case for blazars as ultra-high-energy neutrino sources
• Physical conditions in high$-$z optically thin C III absorbers: Origin of cloud sizes and associated correlations
• partly obscured accretion disk model to explain Shifted broad Balmer emission lines of Active Galactic Nuclei
• Discovery of two quasars at $z=5$ from the OGLE Survey
• Constraining the ratio of median pixel optical depth profile around z ~ 4 quasars using the longitudinal proximity effect
• Leaked Lya emission: an indicator of the size of quasar absorption outflows
• X-ray Unveiling Events in a z~1.6 Active Galactic Nucleus in the 7 Ms Chandra Deep Field-South
• Measuring the Time Variation of the Fine-structure Constant with Quasars Detected by LAMOST
• The Variability of the Broad Line Profiles of SDSS J1430+2303
• Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
• The reddest ISO-2MASS quasar
• A Broker Integrated Algorithm for Gravitational Wave - Electromagnetic Counterpart Searches in O4a and O4b Runs
• Photometric Identification of Objects from Galaxy Evolution Explorer Survey and Sloan Digital Sky Survey
• The broad band SEDs of four 'hypervariable' AGN
• Ultradense Gases beyond Dusty Torus in a Partially Obscured Quasar
• Modeling the Reverberation Response of the Broad Line Region in Active Galactic Nuclei II: Incorporating Photoionization Models
• XMM-Newton and Chandra observations of SHEEP sources
• A Massive Gas Outflow Outside the Line-of-Sight: Imaging Polarimetry of the Blue Excess Hot Dust Obscured Galaxy W0204-0506
• A spectroscopic study of 14 structures behind Holm15A: Detecting a galaxy group candidate at z=0.58
• Keck/ESI Long-slit Spectroscopy of SBS 1421+511: A Recoiling Quasar Nucleus in An Active Galaxy Pair?
• Exploratory X-Ray Monitoring of Luminous Radio-Quiet Quasars at High Redshift: Extended Time-Series Analyses and Stacked Imaging Spectroscopy
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XIV. A Candidate Type-II Quasar at z=6.1292
• The Morphology of Dwarf Galaxies Hosting Variable Active Galactic Nuclei
• Physical conditions and redshift evolution of optically thin C III absorbers: Low-z sample
• The CaFe Project: Optical FeII and Near-Infrared Ca II triplet emission in active galaxies. II. The driver(s) of the Ca II and Fe II and its potential use as a chemical clock
• First detection of VHE gamma-ray signal from the FSRQ TON 0599
• Spectroscopic Quasar Anomaly Detection (SQuAD) I: Rest-Frame UV Spectra from SDSS DR16
• Probing spectral properties of radio-quiet quasars searched for optical microvariability-II
• Strong Optical and UV Intermediate-Width Emission Lines in the Quasar SDSS J232444.80-094600.3: Dust-Free and Intermediate-Density Gas at the Skin of Dusty Torus ?
• The UV/optical Continuum Reverberation Mapping of Eight Active Galactic Nuclei with Swift: Further Evidence for the Outer Component
• A broad-line quasar with unexplained extreme velocity offsets: post-shock outflow?
• The Cosmic Evolution of CIV Absorbers at $1.4<z<4.5$: Insights from $100,000$ Systems in DESI Quasars
• Broad Emission and Absorption Line Outflows in the Quasar SDSS J163345.22+512748.4
• The disk-torus system in active galactic nuclei: possible evidence of highly spinning black holes
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
• OzDES Reverberation Mapping Program: Stacking analysis with H$\beta$, Mg II and C IV
• Exploratory Study of Transverse Proximity Effect around BAL Quasars
• Improved source classification and performance analysis using Gaia DR3
• The Sloan Digital Sky Survey Reverberation Mapping Project: UV-Optical Accretion Disk Measurements with Hubble Space Telescope
• DEIMOS Observations of WISE-Selected, Optically Obscured AGNs
• Wide Field Multiband Imaging of Low Redshift Quasar Environments
• A Strange EUV Emission: Scattered Continuum in the Lymann Limit Absorption Edge toward the Quasar SDSS J125903.26+621211.5?
• DESI Mg II Absorbers: Extinction Characteristics & Quasar Redshift Accuracy
• The rise and fall of Little Red Dots could be driven by the environment
• Gaia-supported re-discovery of a remarkable weak line quasar from a variability and proper motion survey
• Tracing Star Formation in Quasar Hosts via [O II] $\lambda$3727: A Kinematically Consistent Approach
• QUEST (Quasar Unsupervised Encoder and Synthesis Tool): A machine learning framework to generate quasar spectra
• Using the XMM Optical Monitor to Study Cluster Galaxy Evolution
• The unusual spectral energy distribution of LBQS 0102-2713
• A New Member of the Fast and Furious Family: A Relativistic and Time-Variable UV Outflow in a Luminous Quasar
• 3C 294 revisited: Deep Large Binocular Telescope AO NIR images and optical spectroscopy
• A catalog of X-ray point sources in the Abell 133 region
• Early Stages of Dusty Tori: The First Infrared Spectra from a Highly Multiscale Quasar Simulation
• Techniques for Profile Binning and Analysis of Eigenvector Composite Spectra: Comparing Hbeta and MgII 2800 as Virial Estimators
• Far-UV Fe Emission as Proxy of Eddington Ratios
• Supermassive Black Holes in Deep Multiwavelength Surveys
• An Optical-UV Survey of the North Celestial Cap
• Astronomy and the new SI
• Optical study of PKS B1322-110, the intra-hour variable radio source
• Discovery of a Jet-Like Structure at the High Redshift QSO CXOMP J084128.3+131107
• Stellar populations from H-band VLT spectroscopy in a sample of seven active galaxies
• Ultra-luminous high-redshift quasars from SkyMapper -- II. New quasars and the bright end of the luminosity function
• Mean Transmitted Flux in the Ly$\alpha$ Forest From a Sample of 2QZ Quasars
• A tidal disruption event in the nearby ultra-luminous infrared galaxy F01004-2237
• The miniJPAS survey quasar selection I: Mock catalogues for classification
• Near-infrared spectroscopy of extreme BAL QSOs from the QUBRICS bright quasar survey
• Can X-ray Observations Improve Optical-UV-based Accretion-Rate Estimates for Quasars?
• Measurements of quasar proximity zones with the Ly$\alpha$ forest of DESI Y1 quasars
• The Contribution of AGN Accretion Disks to Hydrogen Reionization
• OISTER Optical and Near-Infrared Monitoring Observations of a Peculiar Radio-Loud Active Galactic Nucleus SDSS J110006.07+442144.3
• Estimating the spins of supermassive black holes in distant ultraluminous quasars
• Oxyster: A Circumgalactic Low-ionization Oxygen Nebula next to a Starburst Galaxy at $z\sim 1$
• Revealing a strongly reddened, faint active galactic nucleus population by stacking deep co-added images
• XClass: An Automated Multiwavelength Machine-Learning Pipeline for Classification of Extragalactic X-ray Sources. I. Pipeline Description
• Metal-strong Inflows at the Outer-galactic-scale of a Quasar
• X-Ray Evidence Against the Hypothesis that the Hyper-Luminous z=6.3 Quasar J0100+2802 is Lensed
• The FLARE mission: Deep and Wide-field 1-5$\mu$m Imaging and Spectroscopy for the Early Universe: a proposal for M5 Cosmic Vision call
• Quasars behind the disk of M31 galaxy
• Euclid: A blue galaxy population and a brightest cluster galaxy in the making in a $z\sim 1.74$ MaDCoWS2 galaxy cluster candidate
• SDSS J153231.80+420342.7: a triple black hole candidate with a close binary black hole
• Quasars: from the Physics of Line Formation to Cosmology
• There Are (super)Giants in the Sky: Searching for Misidentified Massive Stars in Algorithmically-Selected Quasar Catalogs
• A quasar shedding its dust cocoon at redshift 2
• Black Hole merger rates in the first billion years in light of JWST data
• Giant radio quasars: composite optical spectra
• Understanding the Nature of an Unusual Post-Starburst Quasar with Exceptionally Strong Ne V Emission
• A Treasure Hunt in the Pool of Spectra Classified as High-redshift QSOs by the Spectroscopic Pipeline of the SDSS DR16
• Euclid preparation. Predicting star-forming galaxy scaling relations with the spectral stacking code SpectraPyle
• AGN jets and a fanciful trio of black holes in the Abell 85 Brightest Cluster Galaxy