A Catalog of Quasar Properties from SDSS DR7

Abstract

We present a compilation of properties of the 105,783 quasars in the SDSS Data Release 7 (DR7) quasar catalog. In this value-added product, we compile continuum and emission line measurements around the Halpha, Hbeta, MgII and CIV regions, as well as other quantities such as radio properties, broad absorption line quasar (BALQSO) flags, and disk emitters. We also compile virial black hole mass estimates based on various calibrations. For the fiducial virial mass estimates we use the Vestergaard & Peterson (VP06) calibrations for Hbeta and CIV, and our own calibration for MgII which matches the VP06 Hbeta masses on average. We describe the construction of this catalog, and discuss its limitations. The catalog and its future updates will be made publicly available online.

arXiv commentUpdated the paper and the catalog; ApJS in press. The catalog can be accessed at https://www.cfa.harvard.edu/~yshen/BH_mass/dr7.htm

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• The Sloan Digital Sky Survey Reverberation Mapping Project: How Broad Emission Line Widths Change When Luminosity Changes
• The nature of massive black hole binary candidates: I. Spectral properties and evolution
• Studying the relationship between X-ray emission and accretion in AGNs using the XMM-Newton Bright Serendipitous Survey
• CIV Line-Width Anomalies: The Perils of Low S/N Spectra
• A hidden population of high-redshift double quasars unveiled by astrometry
• On the origin of excess cool gas in quasar host halos
• The Dependence of C IV Broad Absorption Line Properties on Accompanying Si IV and Al III Absorption: Relating Quasar-Wind Ionization Levels, Kinematics, and Column Densities
• Correlations of Quasar Optical Spectra with Radio Morphology
• Blue Fermi Flat Spectrum Radio Quasars
• Stratified disc wind models for the AGN broad-line region: ultraviolet, optical and X-ray properties
• On the Radio and Optical Luminosity Evolution of Quasars II - The SDSS Sample
• Distinguishing Tidal Disruption Events from Impostors
• Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey
• Massive Star-Forming Host Galaxies of Quasars on Sloan Digital Sky Survey Stripe 82
• The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening
• Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission
• Towards equation of state of dark energy from quasar monitoring: Reverberation strategy
• Searching for Binary Supermassive Black Holes via Variable Broad Emission Line Shifts: Low Binary Fraction
• The contribution of spin to jet-disk coupling in black holes
• Time delay measurement of Mg II line in CTS C30.10 with SALT
• High metal content of highly accreting quasars
• CIV Broad Absorption Line Acceleration in Sloan Digital Sky Survey Quasars
• A complete census of silicate features in the mid-infrared spectra of active galaxies
• Is there a maximum mass for black holes in galactic nuclei?
• The CIV Baldwin effect in QSOs from Seventh Data Release of the Sloan Digital Sky Survey
• SDSSJ143244.91+301435.3: a link between radio-loud narrow-line Seyfert 1 galaxies and compact steep-spectrum radio sources?
• The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: the 4th and 5th Data Release
• Super- and sub-Eddington accreting massive black holes: A comparison of slim and thin accretion discs through study of the spectral energy distribution
• Nature and evolution of powerful radio galaxies and their link with the quasar luminosity function
• Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-ray and Gravitational Wave Observations
• Testing the cosmic curvature at high redshifts: the combination of LSST strong lensing systems and quasars as new standard candles
• 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
• Testing AGN outflow and accretion models with CIV and HeII emission line demographics in z=2 quasars
• Rehabilitating CIV-based black hole mass estimates in quasars
• Discovery of A Mg II Changing-look AGN and its Implications for a Unification Sequence of Changing-look AGNs
• No signs of star formation being regulated in the most luminous quasars at z~2 with ALMA
• Composite Spectral Energy Distributions and Infrared-Optical Colors of Type 1 and Type 2 Quasars
• Orientation effects on spectral emission features of quasars
• The Broad Line Region and Black Hole Mass of NGC 4151
• Line-driven radiative outflows in luminous quasars
• Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey
• Extreme star formation events in quasar hosts over $0.5<\text{z}<4$
• Evidence that most type 1 AGN are reddened by dust in the host ISM
• Extending the Calibration of CIV-Based Single-Epoch Black Hole Mass Estimators for Active Galactic Nuclei
• The properties of broad absorption line outflows based on a large sample of quasars
• The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region
• Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars
• Dust Reverberation Mapping in Distant Quasars from Optical and Mid-Infrared Imaging Surveys
• The Black Hole Masses and Eddington Ratios of Type 2 Quasars
• On the Scatter in the Radius - Luminosity Relationship for Active Galactic Nuclei
• The dust origin of the Broad Line Region and the model consequences for AGN unification scheme
• SUPER III. Broad Line Region properties of AGN at z$\sim$2
• Cosmological test using the Hubble diagram of high-z quasars
• The Baldwin effect in the narrow emission lines of AGNs
• SDSS J102623.61+254259.5: the second most distant blazar at z=5.3
• Investigation on Young radio AGNs based on SDSS spectroscopy
• Herschel-ATLAS: Far-infrared properties of radio-loud and radio-quiet quasars
• Identification of Outflows and Candidate Dual Active Galactic Nuclei in SDSS Quasars at z=0.8-1.6
• Kinematics of CIV and [OIII] emission in luminous high-redshift quasars
• The z=0.54 LoBAL Quasar SDSS J085053.12+445122.5: I. Spectral Synthesis Analysis Reveals a Massive Outflow
• Multifrequency Studies of the Peculiar Quasar 4C +21.35 During the 2010 Flaring Activity
• Statistical Properties of Multi-epoch Spectral Variability of SDSS Stripe82 Quasars
• Exploring the dust content of SDSS DR7 damped Lyman alpha systems at 2.15$\le z_{ab}<$5.2
• Is there a relationship between AGN and star formation in IR-bright AGNs?
• Model-independent constraints on cosmic curvature: implication from updated Hubble diagram of high-redshift standard candles
• On the link between associated MgII absorbers and star formation in quasar hosts
• Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
• Calibration and Limitations of the Mg II line-based Black Hole Masses
• The Properties of Post-Starburst Quasars Based on Optical Spectroscopy
• Probing the Nature of High Redshift Weak Emission Line Quasars: A Young Quasar with a Starburst Host Galaxy
• The picture of BLR in 2.5-D FRADO: Dynamics & Geometry
• Synchronized Co-evolution between Supermassive Black Holes and Galaxies Over the Last Seven Billion Years as Revealed by the Hyper Suprime-Cam
• [OIII] Emission Line Properties in a New Sample of Heavily Reddened Quasars at $z>2$
• Simultaneous Ultraviolet and Optical Emission-line Profiles of Quasars: Implications for Black Hole Mass Determination
• Unveiling early black hole growth with multi-frequency gravitational wave observations
• A Transient "Changing-look'' Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data
• HYPerluminous quasars at the Epoch of ReionizatION (HYPERION). A new regime for the X-ray nuclear properties of the first quasars
• Low redshift quasars in the SDSS Stripe 82. The host galaxies
• The Sloan Digital Sky Survey Reverberation Mapping Project: Post-Starburst Signatures in Quasar Host Galaxies at z < 1
• Eddington ratio Distribution of X-ray selected broad-line AGNs at 1.0<z<2.2
• The first high-redshift changing-look quasars
• Black Hole Mass Estimates and Rapid Growth of Supermassive Black Holes in Luminous $z\sim$ 3.5 Quasars
• Strong Clustering of Lyman Break Galaxies around Luminous Quasars at z~4
• Simulating the timescale dependent color variation in quasars with a revised inhomogeneous disk model
• CLOUDY view of the warm corona
• Supermassive black holes in disk-dominated galaxies outgrow their bulges and co-evolve with their host galaxies
• Leptohadronic Multimessenger Modeling of 324 Gamma-Ray Blazars
• X-ray Observations of Luminous Dusty Quasars at z > 2
• 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 Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Two and Three
• The Nature of Transition Blazars
• A large sample of Kohonen-selected SDSS quasars with weak emission lines: selection effects and statistical properties
• Blazars at the Cosmic Dawn
• A New Infrared Criterion for Selecting Active Galactic Nuclei to Lower Luminosities
• The coevolution of supermassive black holes and galaxies in luminous AGN over a wide range of redshift
• The Sloan Digital Sky Survey Reverberation Mapping Project: Comparison of Lag Measurement Methods with Simulated Observations
• Current and future applications of Reverberation-mapped quasars in Cosmology
• Does the mid-infrared-hard X-ray luminosity relation for active galactic nuclei depend on Eddington ratio?
• Silicate Dust in Active Galactic Nuclei
• Broadband Observations of High Redshift Blazars
• The Sloan Digital Sky Survey Reverberation Mapping Project: the CIV Blueshift, Its Variability, and Its Dependence Upon Quasar Properties
• Is there any evidence that ionised outflows quench star formation in type 1 quasars at z<1?
• Probing the Radio Loud/Quiet AGN dichotomy with quasar clustering
• Accretion Rates of Red Quasars from the Hydrogen P$\beta$ line
• BAT AGN Spectroscopic Survey: XVI. General Physical Characteristics of BAT Blazars
• A New Iron Emission Template for Active Galactic Nuclei. I. Optical Template for the H$\beta$ region
• Ultraviolet variability of quasars: dependence on the accretion rate
• On the cool gaseous haloes of quasars
• Multi-phase outflows in post starburst E+A galaxies -- I. General sample properties and the prevalence of obscured starbursts
• Metallicity in Quasar Broad Line Regions at Redshift $\sim$ 6
• A new bright z=6.82 quasar discovered with VISTA: VHS J0411-0907
• He II Proximity Effect and the Lifetime of Quasars
• CIV and CIII] reverberation mapping of the luminous quasar PG 1247+267
• HS 1700+6416: the first high redshift non lensed NAL-QSO showing variable high velocity outflows
• Super-Eddington Accretion in the WISE-Selected Extremely Luminous Infrared Galaxy W2246-0526
• The mass of the black hole in RE J1034+396
• The Chandra view of the relation between X-ray and UV emission in quasars
• The X-ray/UV ratio in Active Galactic Nuclei: dispersion and variability
• Supermassive black holes with high accretion rates in active galactic nuclei: X. Optical variability characteristics
• The peculiar optical spectrum of 4C+22.25: Imprint of a massive black hole binary?
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine
• Constraints on the Nature of CID-42: Recoil Kick or Supermassive Black Hole Pair?
• Polarization of the changing-look quasar J1011+5442
• Synchrotron and inverse-Compton emission from blazar jets - IV. BL Lac type blazars and the physical basis for the blazar sequence
• Outflow and hot dust emission in broad absorption line quasars
• Constraining the dynamical importance of hot gas and radiation pressure in quasar outflows using emission line ratios
• SDSS J114657.79+403708.6: the third most distant blazar at z=5.0
• How to constrain mass and spin of supermassive black holes through their disk emission
• Blazar candidates beyond redshift 4 observed with GROND
• The origin of radio emission in broad absorption line quasars: Results from the LOFAR Two-metre Sky Survey
• What makes red quasars red? Observational evidence for dust extinction from line ratio analysis
• SDSS J211852.96-073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy
• A New Approach to Constrain Black Hole Spins in Active Galaxies Using Optical Reverberation Mapping
• A deep / wide 1-2 GHz snapshot survey of SDSS Stripe 82 using the Karl G. Jansky Very Large Array in a compact hybrid configuration
• Stability of the Broad Line Region Geometry and Dynamics in Arp 151 Over Seven Years
• NuSTAR reveals the extreme properties of the super-Eddington accreting SMBH in PG 1247+267
• The ensemble photometric variability of over $10^5$ quasars in the Dark Energy Camera Legacy Survey and the Sloan Digital Sky Survey
• Precious Metals in SDSS Quasar Spectra II: Tracking the Evolution of Strong, 0.4 < z < 2.3 MgII Absorbers with Thousands of Systems
• Infrared Classification and Luminosities For Dusty AGN and the Most Luminous Quasars
• The Sloan Digital Sky Survey Reverberation Mapping Project: An Investigation of Biases in CIV Emission-Line Properties
• Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
• Detection of Quasar Feedback from the Thermal Sunyaev-Zel'dovich Effect in Planck
• AGN spectral states from simultaneous UV and X-ray observations by XMM-Newton
• A comparative analysis of virial black-hole mass estimates of moderate-luminosity active galactic nuclei using Subaru/FMOS
• The WISSH quasars project VI. Fraction and properties of BAL quasars in the hyper-luminosity regime
• The Large Sky Area Multi-Object Fiber Spectroscopic Telescope Quasar Survey: Quasar Properties from First Data Release
• The FeII/MgII flux ratio of low-luminosity quasars at z~3
• Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj
• Extreme Variability and Episodic Lifetime of Quasars
• Optical spectroscopy of BL Lac objects: TeV candidates
• Two New "Turn-off" Changing-look Active Galactic nuclei and Implication on "Partially Obscured" AGNs
• A significant excess in major merger rate for AGNs with the highest Eddington ratios at z<0.2
• The AKARI 2.5-5.0 Micron Spectral Atlas of Type-1 Active Galactic Nuclei: Black Hole Mass Estimator, Line Ratio, and Hot Dust Temperature
• The WISSH Quasars Project IV. BLR versus kpc-scale winds
• The rise and fall of the iron-strong nuclear transient PS16dtm
• Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs
• Co-evolution of Extreme Star Formation and Quasar: hints from {\it Herschel} and the Sloan Digital Sky Survey
• Radiative Efficiency of Disk Accretion in Individual SDSS QSOs
• A quasar-galaxy merger at $z\sim 6.2$: black hole mass and quasar properties from the NIRSpec spectrum
• Detection of a possible high-confidence radio quasi-periodic oscillation in the BL Lac PKS J2134-0153
• An Extreme X-ray Variability Event of a Weak-Line Quasar
• Insight into the Starburst Nature of Galaxy GN-z11 with JWST MIRI Spectroscopy
• Exploring the link between C IV outflow kinematics and sublimation-temperature dust in quasars
• The eROSITA Final Equatorial-Depth Survey (eFEDS): A multiwavelength view of WISE mid-infrared galaxies/active galactic nuclei
• A Spectroscopic Survey of WISE-selected Obscured Quasars with the Southern African Large Telescope
• Correlation between the variation of the ionizing continuum and broad absorption lines
• Quasar Photometric Redshifts and Candidate Selection: A New Algorithm Based on Optical and Mid-Infrared Photometric Data
• Chemical Abundance of z~6 Quasar Broad-Line Regions in the XQR-30 Sample
• Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
• Spectral Classification and Ionized Gas Outflows in $z\sim 2$ WISE-Selected Hot Dust-Obscured Galaxies
• Testing cosmic anisotropy with Pantheon sample and quasars at high redshifts
• High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multi-Epoch Spectroscopy
• Basic properties of Fermi blazars and the "blazar sequence"
• Close companions to two high-redshift quasars
• The optical variability of SDSS quasars from multi-epoch spectroscopy. II. color variation
• H$\alpha$ intensity map of the repeating fast radio burst FRB 121102 host galaxy from Subaru/Kyoto 3DII AO-assisted optical integral-field spectroscopy
• The Infrared Medium-deep Survey. VIII. Quasar Luminosity Function at $z\sim 5$
• Reddening of the BLR and NLR in AGN From a Systematic Analysis of Balmer Decrement
• Constraints on the temperature inhomogeneity in quasar accretion discs from the ultraviolet-optical spectral variability
• AGN evolution from galaxy evolution viewpoint - II
• Stellar and black hole assembly in z<0.3 infrared-luminous mergers: intermittent starbursts vs. super-Eddington accretion
• ESO VLT Optical Spectroscopy of BL Lac Objects IV. New spectra and properties of the full sample
• Discovery of an Overdensity of Lyman-alpha Emitters Around a $\mathrm{z}\sim 4$ QSO with the Large Binocular Telescope
• The Covering Factor of Warm Dust in Quasars: View from WISE All-Sky Data Release
• Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3
• SDSS J013127.34$-$032100.1: A newly discovered radio-loud quasar at $z=5.18$ with extremely high luminosity
• SDSS-IV/SPIDERS: A Catalogue of X-Ray Selected AGN Properties; Spectral Properties and Black Hole Mass Estimates for SPIDERS SDSS DR14 Type 1 AGN
• Measuring large-scale structure with quasars in narrow-band filter surveys
• The peculiar emission line spectra of core-Extremely Red BOSS Quasars at $z\sim$2-3: orientation and/or evolution?
• The fraction and kinematics of broad absorption line quasars across cosmic time
• Chemical evolution of the Universe at 0.7 < z < 1.6 derived from abundance diagnostics of the broad-line region of quasars
• The relativistic jet and its central engine of $Fermi$ blazars
• A multi-epoch spectroscopic study of the BAL quasar APM 08279+5255 II. Emission- and absorption-line variability time lags
• Extreme Gaseous Outflows in Radio-Loud Narrow-Line Seyfert 1 Galaxies
• Cosmology with AGN: can we use quasars as standard candles?
• NuSTAR perspective on high-redshift MeV blazars
• Superluminous transients at AGN centers from interaction between black-hole disk winds and broad-line region clouds
• The Changing Look Blazar B2 1420+32
• Multiwavelength Study of High-Redshift Blazars
• Interpretation of Departure from the Broad Line Region Scaling in Active Galactic Nuclei
• High redshift BL Lac objects: spectroscopy of candidates
• A Metal-Strong and Dust-Rich Damped \lya Absorption System toward the Quasar SDSS J115705.52+615521.7
• Flare-like Variability of the Mg~II $\lambda$2798 Å Emission Line and UV Fe~II band in the Blazar CTA~102
• The Time-Domain Spectroscopic Survey: Target Selection for Repeat Spectroscopy
• Properties of AGN Multiband Optical Variability in the HSC SSP Transient Survey
• Spectral Variability of a Sample of Extreme Variability Quasars and Implications for the MgII Broad-line Region
• Herschel observed Stripe 82 quasars and their host galaxies: connections between the AGN activity and the host galaxy star formation
• The LSST era of supermassive black holes accretion-disk reverberation mapping
• The optical-UV emissivity of quasars: dependence on black hole mass and radio loudness
• A Systematic Analysis of Stellar Populations in the Host Galaxies of Changing-look AGNs
• The Estimation of Fundamental Physics Parameters for Fermi-LAT Blazars
• The dust content of damped Lyman-alpha systems in the Sloan Digital Sky Survey
• Low redshift quasars in the SDSS Stripe 82. The local environments
• What controls the UV-to-X-ray continuum shape in quasars?
• Near-IR spectroscopy of luminous LoBAL quasars at 1<z<2.5
• The host galaxies of FeLoBAL quasars at z$\sim$0.9 are not dominated by recent major mergers
• A large sample of Kohonen selected E+A (post-starburst) galaxies from the Sloan Digital Sky Survey
• Radiation pressure on dust explains the Low Ionized Broad Emission Lines in Active Galactic Nuclei
• Exploring the Hubble Tension and Spatial Curvature from the Ages of Old Astrophysical Objects
• Evolution of quasar stochastic variability along its main sequence
• Scatter Analysis Along the Multidimensional Radius-Luminosity Relations for Reverberation-Mapped Mg II Sources
• Physical Properties of Luminous Dust Poor Quasars
• A forward modelling approach to AGN variability -- Method description and early applications
• An Unusual Mid-Infrared Flare in a Type 2 AGN: An Obscured Turning-on AGN or Tidal Disruption Event?
• The CaFe Project: Optical Fe II and Near-Infrared Ca II triplet emission in active galaxies: (I) Photoionization modelling
• Black-hole mass estimates for a homogeneous sample of bright flat-spectrum radio quasars
• The connection between star formation and supermassive Black Hole activity in the local Universe
• The case against large intensity fluctuations in the z ~ 2.5 HeII Lyman-alpha forest
• Empirical Links between XRB and AGN accretion using the complete z<0.4 spectroscopic CSC/SDSS Catalog
• Location and energetics of the ultra-fast outflow in PG 1448+273
• Statistics of Galactic-Scale Quasar Pairs at Cosmic Noon
• Jet Properties of Compact Steep-Spectrum Sources and an Eddington-Ratio-Driven Unification Scheme of Jet Radiation in Active Galactic Nuclei
• Survey of Extremely High-velocity Outflows in Sloan Digital Sky Survey Quasars
• First HETDEX Spectroscopic Determinations of Ly$\alpha$ and UV Luminosity Functions at $z=2-3$: Bridging a Gap Between Faint AGN and Bright Galaxies
• Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within $10^4$ years
• Steep Hard-X-ray Spectra Indicate Extremely High Accretion Rates in Weak Emission-Line Quasars
• Disk-Jet Connection in Active Supermassive Black Holes in the Standard Accretion Disk Regime
• Evidence for the alignment of quasar radio polarizations with large quasar group axes
• Broadband Observations of the Gamma-ray Emitting Narrow Line Seyfert 1 Galaxy SBS 0846+513
• Demographics of z ~ 6 Quasars in the Black Hole Mass-Luminosity Plane
• Quasars Probing Quasars IX. The Kinematics of the Circumgalactic Medium Surrounding z ~ 2 Quasars
• Quasars and their emission lines as cosmological probes
• The Dust-to-Gas Ratio and the Role of Radiation Pressure in Luminous, Obscured Quasars
• Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter
• Panchromatic Properties of the Extreme FeII Emitter PHL 1092
• AT 2021loi: A Bowen Fluorescence Flare with a Rebrightening Episode, Occurring in a Previously-Known AGN
• The evolution of the heaviest super-massive black-holes in jetted AGNs
• SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-ray Variability
• Discovery of the most ultra-luminous QSO using Gaia, SkyMapper and WISE
• Constraining FeLoBAL outflows from absorption line variability
• On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin-Mass Plane
• A novel black-hole mass scaling relation based on coronal gas, and its dependence with the accretion disc
• Calibrating Mg II-based black-hole mass estimators using Low-to-High-Luminosity Active Galactic Nuclei
• Narrow absorption lines with two observations of Sloan Digital Sky Survey
• Fe III emission in quasars: evidence for a dense turbulent medium
• Jet Power of Jetted Active Galactic Nuclei: Implication for Evolution and Unification
• An Off-Nucleus Nonstellar Black Hole in the Seyfert Galaxy NGC 5252
• Dark bubbles around high-redshift radio-loud AGN
• Observational evidence that positive and negative AGN feedback depends on galaxy mass and jet power
• Modeling Quasar UV/Optical Variability with the Corona-heated Accretion-disk Reprocessing (CHAR) Model
• Deconstructing the narrow-line region of the nearest obscured quasar
• Prior-Informed AGN-Host Spectral Decomposition Using PyQSOFit
• Quasar spectral variability from the XMM-Newton serendipitous source catalogue
• The optical spectrum of PKS 1222+216 and its black hole mass
• Reaching the Peak of the quasar spectral energy distribution - II. Exploring the accretion disc, dusty torus and host galaxy
• The High Redshift Blazar S5 0836+71: A Broadband Study
• On the efficiency of jet production in FR II radio galaxies and quasars
• The spectral and environment properties of $z\sim 2.0-2.5$ quasar pairs
• Evidence for AGN-driven Outflows in Young Radio Quasars
• A Method to Measure the Unbiased Decorrelation Timescale of the AGN Variable Signal from Structure Functions
• Nustar Measurement Of Coronal Temperature In Two Luminous, High Redshift Qsos
• Placing High-Redshift Quasars in Perspective: a Catalog of Spectroscopic Properties from the Gemini Near Infrared Spectrograph -- Distant Quasar Survey
• On the origins of C IV absorption profile diversity in broad absorption line quasars
• Testing the Evolution of the Correlations between Supermassive Black Holes and their Host Galaxies using Eight Strongly Lensed Quasars
• An FMOS Survey of moderate-luminosity broad-line AGN in COSMOS, SXDS and E-CDF-S
• The intrinsic Baldwin effect in broad Balmer lines of six long-term monitored AGNs
• Extended narrow-line emission in the bright Seyfert 1.5 galaxy HE 2211-3903
• An extended size-luminosity relation for the reverberation-mapped AGNs: the role of the accretion rate
• The WISSH quasars project XI. The mean Spectral Energy Distribution and Bolometric Corrections of the most luminous quasars
• 3C 57 as an Atypical Radio-Loud Quasar: Implications for the Radio-Loud/Radio-Quiet Dichotomy
• Quasar broad absorption line variability measurements using reconstructions of un-absorbed spectra
• Estimating AGN Black Hole Masses via Continuum Reverberation Mapping in the Era of LSST
• NuSTAR Observations of Intrinsically X-ray Weak Quasar Candidates: An Obscuration-Only Scenario
• Lorentz factor distribution of blazars from the optical Fundamental plane of black hole activity
• High-redshift blazars through nustar eyes
• Extreme Variability Quasars in Their Various States. I: The sample selection and composite SDSS spectra
• Radio-mode feedback in local AGNs: dependence on the central black hole parameters
• C IV BAL disappearance in a large SDSS QSO sample
• Do the spectral energy distributions of type 1 AGN show diversity?
• Near Infrared Spectra and Intrinsic Luminosities of Candidate Type II Quasars at 2 < z < 3.4
• Recurring tidal disruption events a decade apart in IRAS F01004-2237
• Evidence for higher black hole spin in radio-loud quasars
• Unveiling the physics behind the spectral variations of "changing-look" quasars with optical polarimetry
• On the cosmological evolution of the black hole - host galaxy relation in quasars
• On the relation between hard X-ray photon index versus accretion rate for super-Eddington accreting quasars
• Testing the cosmic opacity at higher redshifts: implication from quasars with available UV and X-ray observations
• The host galaxy properties of variability selected AGN in the Pan-STARRS1 Medium-Deep Survey
• Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars-III
• Radio-loud Quasars above Redshift 4: VLBI Imaging of an Extended Sample
• Chandra and Magellan/FIRE follow-up observations of PSO167-13: an X-ray weak QSO at $z=6.515$
• X-ray properties of dust-obscured galaxies with broad optical/UV emission lines
• An extensive study of blazar broad emission line: Changing-look blazars and Baldwin effect
• Orientation and quasar black hole mass estimation
• Subaru Hyper Suprime-Cam View of Quasar Host Galaxies at z < 1
• The co-evolution of black hole growth and star formation from a cross-correlation analysis between quasars and the cosmic infrared background
• Variability of Low-ionization Broad Absorption Line Quasars Based on Multi-epoch Spectra from The Sloan Digital Sky Survey
• Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at $|b|<20°$
• A Uniform History for Galaxy Evolution
• Co-evolution of Galaxies and Central Black Holes: Observational Evidence on the Trigger of AGN Feedback
• Extreme quasars as distance indicators in cosmology
• Caltech-NRAO Stripe 82 Survey (CNSS). IV. The Birth of Radio-loud Quasar 013815+00
• Potential signature of Population III pair-instability supernova ejecta in the BLR gas of the most distant quasar at z = 7.54
• Detection of a gamma-ray flare from the high-redshift blazar DA 193
• Blazar nature of high-z radio-loud quasars
• A Black Hole Mass-Variability Time Scale Correlation at Submillimeter Wavelengths
• An Apparent Redshift Dependence of Quasar Continuum: Implication for Cosmic Dust Extinction?
• GA-NIFS and EIGER: A merging quasar host at z=7 with an overmassive black hole
• Chemical enrichment and accretion of nitrogen-loud quasars
• Gravitational-wave constraints on the cosmic opacity at $z\sim 5$: forecast from space gravitational-wave antenna DECIGO
• Spatially Resolving the Kinematics of the <100 μas Quasar Broad Line Region using Spectroastrometry
• A Direct Measurement of the Mean Occupation Function of Quasars: Breaking Degeneracies between Halo Occupation Distribution Models
• The Blueshift Of Civ Broad Emission Line In Qsos
• High Eddington quasars as discovery tools: current state and challenges
• Variability of QSOs with variable regions in broad absorption troughs from the Sloan Digital Sky Survey
• The accretion of a solar mass per day by a 17-billion solar mass black hole
• Gaia reference frame amid quasar variability and proper motion patterns in the data
• Directly tracing cool filamentary accretion over >100 kpc into the interstellar medium of a quasar host at z=1
• The optical variability of SDSS quasars from multi-epoch spectroscopy: I. Results from 60 quasars with $\ge$ six-epoch spectra
• Spectroscopic classification, variability and SED of the Fermi-detected CSS 3C 286: the radio-loudest NLS1 galaxy?
• The Contribution of Quasar Absorption Outflows to AGN Feedback
• The Timescale-Dependent Color Variability of Quasars Viewed with GALEX
• 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
• The environment of weak emission-line quasars
• Two Candidate High-Redshift X-ray Jets Without Coincident Radio Jets
• Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity
• Emergences of C IV narrow absorption troughs in the quasar SDSS J095254.10+021932.8
• Genuine Retrieval of the AGN Host Stellar Population (GRAHSP)
• Optical spectral characterization of the gamma-ray blazars S4 0954+65, TXS 1515-273 and RX J0812.0+0237
• Faint COSMOS AGN at z~3.3 - I. Black Hole Properties and Constraints on Early Black Hole Growth
• 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
• The Seoul National University AGN monitoring project. II. BLR size and black hole mass of two AGNs
• Spectral variability of FIRST bright QSOs with SDSS observations
• Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies: Past, Present, and Future
• Discovery and origins of giant optical nebulae surrounding quasar PKS 0454-22
• The Frequency of Intrinsic X-ray Weakness Among Broad Absorption Line Quasars
• The Hunt for Red Quasars: Luminous Obscured Black Hole Growth Unveiled in the Stripe 82 X-ray Survey
• The evolution of dusty torus covering factor in quasars
• Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS
• Dust-driven wind as a model of Broad Absorption Line quasars
• High-redshift quasars along the Main Sequence
• Quasar Factor Analysis -- An Unsupervised and Probabilistic Quasar Continuum Prediction Algorithm with Latent Factor Analysis
• Systematically smaller single-epoch quasar black hole masses using a radius-luminosity relationship corrected for spectral bias
• Dependence of NLRs sizes on [OIII] luminosity in low redshift AGN with double-peaked broad Balmer emission lines
• A Thirty-Four Billion Solar Mass Black Hole in SMSS J2157-3602, the Most Luminous Known Quasar
• Long-term optical spectroscopic variations in blazar 3C 454.3
• The Accretion History of AGN: A Newly Defined Population of Cold Quasars
• Spectral Energy Distributions of Candidate Periodically-Variable Quasars: Testing the Binary Black Hole Hypothesis
• Quenching of supermassive black hole growth around the apparent maximum mass
• A New Model for Dark Matter Halos Hosting Quasars
• Low redshift quasars in the SDSS Stripe 82. Host galaxy colors and close environment
• Transient C IV Broad Absorption Lines in radio detected QSOs
• The Extreme Super-Eddington NLS1 RX J0134.2-4258 -- II. A Weak-Line Seyfert Linking to the Weak-Line Quasar
• Placing LOFAR-detected quasars in CIV emission space: implications for winds, jets and star formation
• Spectropolarimetry of low redshift Quasars: origin of the polarization and implications for black hole mass estimates
• Resolving Disks & Mergers in $z\sim 2$ Heavily Reddened Quasars and their Companion Galaxies with ALMA
• A new discovery space opened by eROSITA: Ionised AGN outflows from X-ray selected samples
• Discovery of strong Balmer line absorption in two luminous LoBAL quasars at z~1.5
• Evidence of Pop~III stars' chemical signature in neutral gas at z~6. A study based on the E-XQR-30 spectroscopic sample
• The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) I. Sample selection
• Discovery of merging twin quasars at z = 6.05
• The Mass-Richness Relation of MaxBCG Clusters from Quasar Lensing Magnification using Variability
• Relativistic redshifts in quasar broad lines
• Truth or delusion? A possible gravitational lensing interpretation of the ultra-luminous quasar SDSS J010013.02+280225.8 at $z=6.30$
• Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models
• The Infrared Medium-deep Survey. IV. Low Eddington Ratio of A Faint Quasar at $z\sim 6$: Not Every Supermassive Black Hole is Growing Fast in the Early Universe
• Rest-frame optical properties of luminous, radio-selected, broad absorption line quasars
• The underlying driver for the \civ Baldwin effect in QSOs with $0<z<5$
• Relation between the variations in the MgII $\lambda 2798$ emission-line and the 3000 Å continuum
• A 6.4yr optical quasi-periodic oscillations in SDSS J075217.84+193542.2: a new candidate for central binary black hole system
• SALT long-slit spectroscopy of CTS C30.10: two-component Mg II line
• Simultaneous detection and analysis of optical and ultraviolet broad emission lines in quasars at z~2.2
• FERMI transient J1544-0649: a flaring radio-weak BL Lac
• Deceleration of CIV and SiIV broad absorption lines in X-ray bright quasar SDSS-J092345+512710
• Broad absorption line disappearance/emergence in multiple ions in a weak emission-line quasar
• Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-Loud Narrow-Line Seyfert 1 Galaxy?
• Single-Epoch Black Hole Mass Estimators For Broad-Line Active Galactic Nuclei: Recalibrating Hbeta with A New Approach
• A hard look at NGC 5347: revealing a nearby Compton-thick AGN
• Imprints of the quasar structure in time-delay light curves: Microlensing-aided reverberation mapping
• Binary Disk interaction II: Gap-Opening criteria for unequal mass binaries
• A Rapid and Large-Amplitude X-ray Dimming Event in a z ~ 2.6 Radio-Quiet Quasar
• TXS 2116$-$077: A Gamma-ray Emitting Relativistic Jet Hosted in a Galaxy Merger
• Powerful Radio-Loud Quasars are Triggered by Galaxy Mergers in the Cosmic Bright Ages
• The Nature of Obscuration in AGN: I. Insights from Host Galaxies
• Detection of a high-confidence quasi-periodic oscillation in radio light curve of the high redshift FSRQ PKS J0805-0111
• Fantastic Fits with fantasy of Active Galactic Nuclei Spectra -- Exploring the Fe II emission near the H$\alpha$ line
• A High Fraction of Double-peaked Narrow Emission Lines in Powerful Active Galactic Nuclei
• The optical variability of steep-spectrum radio quasars in the SDSS Stripe 82 region
• JWST ERS Program Q3D: The pitfalls of virial BH mass constraints shown in a z = 3 quasar with an ultramassive host
• The supermassive black hole masses of reverberation-mapped active galactic nuclei
• An intrinsic link between long-term UV/optical variations and X-ray loudness in quasars
• Properties of long-term optical variability of active galactic nuclei with double-peaked broad low-ionization emission lines
• The Properties of Low-Redshift FeLoBAL Quasars: III. The Location and Geometry of the Outflows
• OzDES Reverberation Mapping Program: Lag recovery reliability for 6-year CIV analysis
• The rest-frame ultraviolet properties of radio-loud broad absorption line quasars
• An empirical relation to estimate host galaxy stellar light from AGN spectra
• The properties of active galaxies at the extreme of eigenvector 1
• Effects of extended components of \oiii on the correlation between the \oiii luminosity and the power-law continuum luminosity for active galactic nuclei
• The most luminous blue quasars at 3.0<z<3.3. II. CIV/X-ray emission and accretion disc physics
• The X-ray spectral and variability properties of typical radio-loud quasars
• Appearance vs Disappearance of broad absorption line troughs in quasars
• Estimating Spectroscopic Redshifts by Using k Nearest Neighbors Regression I. Description of Method and Analysis
• The Sloan Digital Sky Survey Reverberation Mapping Project: Composite Lags at $z\lesssim 1$
• Ensemble power spectral density of SDSS quasars in UV/optical bands
• Suppression of Low-mass Galaxy Formation around Quasars at z~2-3
• Spectroscopy along Multiple, Lensed Sightlines through Outflowing Winds in the Quasar SDSS J1029+2623
• Vanishing Absorption and Blueshifted Emission in FeLoBAL Quasars
• Rapidly varying Mg II broad absorption line in SDSS J133356.02+001229.1
• Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars
• The central engine of the highest redshift blazar
• Reliable Identification of Binary Supermassive Black Holes from Rubin Observatory Time-Domain Monitoring
• Characterization of Optical Light Curves of Extreme Variability Quasars Over a ~16-yr Baseline
• Mg II and Fe II fluxes of luminous quasars at z ~ 2.7 and evaluation of the Baldwin effect in the flux-to-abundance conversion method for quasars
• Multiwavelength analysis and the difference in the behavior of the spectral features during the 2010 and 2014 flaring periods of the blazar 3C 454.3
• Measurements of effective optical depth in the Ly$\alpha$ forest from the BOSS DR12 Quasar sample
• The rest-frame UV-to-optical spectroscopy of APM 08279+5255 - BAL classification and black hole mass estimates
• ZBLLAC -- A spectroscopic database of BL Lacertae objects
• A Cross-correlation Analysis of AGN and Galaxies using Virtual Observatory: Dependence on Virial Mass of Super-Massive Black Hole
• Constraining AGN Torus Sizes with Optical and Mid-Infrared Ensemble Structure Functions
• The luminosity dependence of quasar UV continuum slope: dust extinction scenario
• Clear evidence for the early triggering of a luminous quasar-like AGN in a major, gas rich merger
• A NuSTAR view of powerful gamma-ray loud blazars
• What produces the extended LINER-type emission in the NUGA galaxy NGC 5850?
• A Big Red Dot: Scattered light, host galaxy signatures and multi-phase gas flows in a luminous, heavily reddened quasar at cosmic noon
• The Most Massive Active Galactic Nuclei at $1\lesssim z\lesssim 2$
• Measuring the luminosity and virial black hole mass dependence of quasar-galaxy clustering at z ~ 0.8
• Authentic Science Experiences with STEM Datasets: Post-secondary Results and Potential Gender Influences
• Metal enrichment by radiation pressure in active galactic nucleus outflows -- theory and observations
• Disappearance of a narrow Mg II absorption system with a measured velocity up to $166,000km{\mathrm{s}}^{-1}$
• Mid-Infrared Selected Quasars I: Virial Black Hole Mass and Eddington Ratios
• Using the Properties of Broad Absorption Line Quasars to Illuminate Quasar Structure
• Estimators of Bolometric Luminosity and Black Hole Mass with Mid-infrared Continuum Luminosities for Dust-obscured Quasars: Prevalence of Dust-obscured SDSS Quasars
• Quasars as a tracer of large-scale structures in the distant universe
• Behaviour of the MgII 2798AA Line Over the Full Range of AGN Variability
• Intermediate Inclinations of Type 2 Coronal-Line Forest AGN
• GA-NIFS: A galaxy-wide outflow in a Compton-thick mini-BAL quasar at z = 3.5 probed in emission and absorption
• The black hole - host galaxy relation for very low-mass quasars
• Connecting Low- and High-Redshift Weak Emission-Line Quasars via HST Spectroscopy of Ly$\alpha$ Emission
• Medium-resolution Optical and Near-Infrared Spectral Atlas of 16 2MASS-selected NIR-red Active Galactic Nuclei at $z\sim 0.3$
• Baldwin Effect and Additional BLR Component in AGN with Superluminal Jets
• Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron IV. The quasar 3C 345 at 18 cm: Magnetic field structure and brightness temperature
• The Sloan Digital Sky Survey Reverberation Mapping Project: Biases in z>1.46 Redshifts due to Quasar Diversity
• Ca II Absorbers in the Sloan Digital Sky Survey: Statistics
• The spatial clustering of ROSAT all-sky survey Active Galactic Nuclei: V. The evolution of broad-line AGN clustering properties in the last 6 Gyr
• Reverberation Mapping with Intermediate-Band Photometry: Detection of Broad-Line H$\alpha$ Time Lags for Quasars at $0.2<z<0.4$
• Quasar outflow energetics from broad absorption line variability
• Collective properties of quasar narrow associated absorption lines
• A Candidate Tidal Disruption Event in a Quasar at z=2.359 from Abundance Ratio Variability
• The link between star-formation and supermassive black hole properties
• A catalog of quasar properties from the Baryon Oscillation Spectroscopic Survey
• Probing the disk-corona systems and broad line regions of changing-look quasars with X-ray and optical observations
• Prescriptions for Correcting Ultraviolet-Based Redshifts for Luminous Quasars at High Redshift
• The X-ray Luminosity Function Evolution of Quasars and the Correlation Between the X-ray and Ultraviolet Luminosities
• An Unobscured type II quasar candidate: SDSS J012032.19-005501.9
• Broad-band spectral energy distribution of 3000 Angstroem break quasars from the Sloan Digital Sky Survey
• Gemini Near Infrared Spectrograph -- Distant Quasar Survey: Augmented Spectroscopic Catalog and a Prescription for Correcting UV-Based Quasar Redshifts
• XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326
• Extreme nature of four blue-excess dust-obscured galaxies revealed by optical spectroscopy
• Quasar main sequence in the UV plane
• No redshift evolution in the rest-frame UV emission line properties of quasars from z=1.5 to z=4.0
• A 3.8yr optical quasi-periodic oscillations in blue quasar SDSS J132144+033055 through combined light curves from CSS and ZTF
• On the Performance of Quasar Reverberation Mapping in the Era of Time-Domain Photometric Surveys
• Shedding New Light on Weak Emission-Line Quasars in the C${}_{\mathrm{IV}}$-H$\beta$ Parameter Space
• The optically-selected 1.4-GHz quasar luminosity function below 1 mJy
• Kinematics of the H$\alpha$ and H$\beta$ broad line region in an SDSS sample of type 1 AGNs
• The GALEX Time Domain Survey. II. Wavelength-Dependent Variability of Active Galactic Nuclei in the Pan-STARRS1 Medium Deep Survey
• Extremely Massive Quasars are not Good Proxies for Dense Environments Compared to Massive Galaxies: Environments of Extremely Massive Quasars and Galaxies
• Kinematically Identified Recoiling Supermassive Black Hole Candidates in SDSS QSOs with z $<$ 0.25
• Dusty plasma in active galactic nuclei
• The cold molecular gas in z$\gtrsim$6 quasar host galaxies
• Black hole masses of weak emission line quasars based on continuum fit method
• Near-infrared spectroscopy of a nitrogen-loud quasar SDSS J1707+6443
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• Relativistic Self-similar Dynamic Collapses of Black Holes in General Polytropic Spherical Clouds
• Comparing different indicators of quasar orientation
• Broad-line region configuration of the supermassive binary black hole candidate PG1302-102 in the relativistic Doppler boosting scenario
• Strong and Rapid X-ray Variability of the Super-Eddington Accreting Quasar SDSS J081456.10+532533.5
• Astrometric Reverberation Mapping
• SHELLQs. Bridging the Gap: JWST Unveils Obscured Quasars in the Most Luminous Galaxies at z > 6
• Estimating Black Hole Masses in Hundreds of Quasars
• Chandra Detection of Three X-ray Bright Quasars at z>5
• Quasars as standard candles VI: spectroscopic validation of the cosmological sample
• A Little Red Dot at $\mathbf{z}=7.3$ within a Large Galaxy Overdensity
• Molecular gas and dust properties in $z>7$ quasar hosts
• Modelling the AGN broad line region using single-epoch spectra I. The test case of Arp 151
• The large gamma-ray flare of the FSRQ PKS 0346-27
• Discovery of the disturbed radio morphology in the interacting binary quasar FIRST J164311.3+315618
• Individual optical variability of Active Galactic Nuclei from the MEXSAS2 sample
• Comparison of The UV and Optical Fe II Emission in Type 1 AGNs
• New Clues to Jet Launching: The inner disks in radio loud quasars may be more stable
• Towards an informed quest for accretion disc winds in quasars: the intriguing case of Ton 28
• Observations of the gamma-ray emitting narrow-line Seyfert 1, SBS 0846+513, and its host galaxy
• X-ray and multi-epoch optical/UV investigations of BAL to non-BAL quasar transformations
• Locations of optical and $\gamma$-ray emitting regions in the jet of PMN J2345-1555
• Black hole mass and spin estimates of the most distant quasars
• MAGIC: Muse gAlaxy Groups In Cosmos -- A survey to probe the impact of environment on galaxy evolution over the last 8 Gyr
• Rest-frame UV single-epoch black hole mass estimates of low-luminosity AGN at intermediate redshifts
• Dynamical Modeling of the CIV Broad Line Region of the $z=2.805$ Multiply Imaged Quasar SDSS J2222+2745
• Polar Dust Emission in Quasar IR SEDs and Its Correlation with Narrow Line Regions
• Proof of CMB-driven X-ray brightening of high-z radio galaxies
• MALS SALT-NOT survey of MIR-selected powerful radio-bright AGN at 0<z<3.5
• Probing black hole accretion in quasar pairs at high redshift
• Reducing and Analyzing the PHAT Survey with the Cloud
• CIV emission line properties and uncertainties in black hole mass estimates of z ~ 3.5 quasars
• A Candidate Dual QSO at Cosmic Noon
• Wavelength-resolved Reverberation Mapping of quasar CTSC30.10: Dissecting MgII and FeII emission regions
• The SOUX AGN Sample: SDSS-XMM-Newton Optical, Ultraviolet and X-ray selected active galactic nuclei spanning a wide range of parameter space -- Sample definition
• The jets-accretion relation, mass-luminosity relation in Fermi blazars
• Properties of Interstellar Medium In Infrared Bright QSOs Probed by [O I]63 micron and [C II]158 micron Emission Lines
• VLT/SINFONI study of black hole growth in high redshift radio-loud quasars from the CARLA survey
• BLR size in Realistic FRADO Model: The role of shielding effect
• No evidence for an Eddington-ratio dependence of X-ray weakness in BALQSOs
• Properties of Galaxies around AGNs with Most Massive Supermassive Black Hole Revealed by the Clustering Analysis
• More variable quasars have stronger emission lines
• SDSS J1138+3517: A quasar showing remarkably variable broad absorption lines
• The Infrared Medium-Deep Survey II: How to Trigger Radio-AGN? Hints from Their Environments
• Constraints on the relative sizes of intervening Mg II-absorbing clouds and quasar emitting regions
• X-ray obscuration from a variable ionized absorber in PG 1114+445
• Hidden Broad-line Regions in Seyfert 2 Galaxies: from the spectropolarimetric perspective
• Spectroscopy of broad absorption line quasars at $3\lesssim z\lesssim 5$ -- I: evidence for quasar winds shaping broad/narrow emission line regions
• SDSS J1058+5443: A blue quasar does not have optical/NUV broad emission lines
• Spatially resolved Lyman-$\alpha$ emission around radio bright quasars
• Estimating black hole masses: Accretion disk fitting versus reverberation mapping and single epoch
• Linear Spectropolarimetric Analysis of Fairall 9 with VLT/FORS2
• Halo Masses of MgII absorbers at z\sim 0.5 from SDSS DR7
• 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
• Time variability of ultra-fast BAL outflows using SALT: C IV equivalent width analysis
• Constraints on the composition, magnetization, and radiative efficiency in jet of blazar
• Optical polarisation variability of radio loud narrow line Seyfert 1 galaxies. Search for long rotations of the polarisation plane
• Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars-IV
• Radio-Loud and Radio-Quiet BAL Quasars: A Detailed Ultraviolet Comparison
• Investigating the radio-loud phase of broad absorption line quasars
• Characterizing Quasars in the Mid-infrared: High Signal-to-Noise Spectral Templates
• Connection between Emission and Absorption Outflows through the Study of Quasars with Extremely-High Velocity Outflows
• ALMA 300 pc resolution imaging of a z=6.79 quasar: no evidence for supermassive black hole influence on the [C II] kinematics
• B2 0954+25A: a typical Fermi blazar or a gamma-loud Narrow Line Seyfert 1
• Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey
• An XMM-Newton Study of Six Narrow-Line Seyfert 1 Galaxies at z = 0.35--0.92
• The ALPINE-CRISTAL-JWST Survey: Revealing Less Massive Black Holes in High-Redshift Galaxies
• Variability of broad absorption lines in a QSO SDSS J022844.09+000217.0 on multi-year timescales
• Discovery of a Low-Redshift Hot Dust-Obscured Galaxy
• The Study of Circumgalactic Medium with Quasar Pairs
• Quasar Main Sequence: a line or a plane?
• Pulsar Timing Array Constraints on the Merger Timescale of Subparsec Supermassive Black Hole Binary Candidates
• Dark Energy Survey Identification of A Low-Mass Active Galactic Nucleus at Redshift 0.823 from Optical Variability
• A Spatially-Resolved Survey of Distant Quasar Host Galaxies: II. Photoionization and Kinematics of the ISM
• The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars
• The Optical Variability of SDSS Quasars from Multi-epoch Spectroscopy. III. A Sudden UV Cutoff in Quasar SDSS J2317+0005
• The U.S. Naval Observatory VLBI Spectroscopic Catalog
• The nature of massive black hole binary candidates: II. Spectral energy distribution atlas
• Covering factors of the dusty obscurers in radio-loud and radio-quiet quasars
• Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multi-band surveys
• Black hole virial masses from single-epoch photometry: the miniJPAS test case
• SDSS J222428.53+261423.2: unique emission lines properties unveil a sub-kiloparsec dual AGN candidate
• Testing the Completeness of the SDSS Colour Selection for Ultramassive, Slowly Spinning Black Holes
• Multiwavelength analysis and the C IV λ1549 Å emission line behavior from 2008 to 2020 of the FSRQ B2 1633+382
• The XMM-Newton Bright Survey sample of absorbed quasars: X-ray and accretion properties
• Near-Infrared Spectroscopy of Quasars at z~3 and Estimates of Their Supermassive Black Hole Masses
• Selection of Burst-like Transients and Stochastic Variables Using Multi-Band Image Differencing in the Pan-STARRS1 Medium-Deep Survey
• eROSITA Final Equatorial-Depth Survey (eFEDS): eFEDS X-ray view of WERGS Radio Galaxies selected by the Subaru/HSC and VLA/FIRST survey
• The dust, nebular emission and dependence on QSO radio properties of the associated Mg II absorption line systems
• Characterising SMSS J2157--3602, the most luminous known quasar, with accretion disc models
• Evidence of a fraction of LIGO/Virgo/KAGRA events coming from active galactic nuclei
• Evaluating and Improving the Redshifts of z>2.2 Quasars
• Properties of radio-loud quasars in Sloan Digital Sky Survey
• A candidate of binary black hole system in AGN with broad Balmer emission lines having quite different line widths
• An observational link between AGN Eddington ratio and [NII]λ6583/Ha at 0.6<z<1.7
• The disappearance of a narrow Mg II absorption system in quasar SDSS J165501.31+260517.4
• The Nature of Luminous Quasars with Very Large C IV Equivalent Widths
• On The Fine Tuning and Physical Origin of Line-Locked Absorption Systems in Active Galaxies
• High Star Formation Rates of Low Eddington Ratio Quasars at $z\gtrsim 6$
• Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly$\alpha$ halos
• Gemini Near Infrared Spectrograph - Distant Quasar Survey: Prescriptions for Calibrating UV-Based Estimates of Supermassive Black Hole Masses in High-Redshift Quasars
• Submm-bright X-ray absorbed QSOs at z~2: insights into the co-evolution of AGN and star-formation
• The non-linear X-ray/UV relation in active galactic nuclei: contribution of instrumental effects on the X-ray variability
• Multi-epoch spectroscopy of Mg II broad absorption line transitions
• Is GN-z11 powered by a super-Eddington massive black hole?
• The low-mass end of the Mbh/Mhost relation in quasars
• Broadband Photometric Reverberation Mapping Analysis on SDSS-RM and Stripe 82 Quasars
• Eddington Ratios of Dust-obscured Quasars at $z\lesssim 1$: Evidence Supporting Dust-obscured Quasars as Young Quasars
• Early formation of supermassive black holes from the collapse of strongly self-interacting dark matter
• Spectropolarimetry and spectral decomposition of high-accreting Narrow Line Seyfert 1 galaxies
• How Similar are the Properties of Quasars with Nearly Identical Ultraviolet Spectra?
• A Systematic Analysis of Stellar Populations in the Host Galaxies of SDSS Type I QSOs
• Observational nonstationarity of AGN variability: The only way to go is down!
• A Closer Look at Two of the Most Luminous Quasars in the Universe
• A Sample Bias in Quasar Variability Studies
• VLA Snapshot Continuum Survey of FRI Quasar Candidates Selected from the LOFAR Two-Metre Sky Survey (LoTSS)
• Modelling the variable emission states of $\gamma$-ray emitting Narrow-Line Seyfert 1 galaxies
• The Mass Distribution of Quasars in Optical Time-domain Surveys
• A novel Bayesian approach for decomposing the radio emission of quasars: II. Link between quasar radio emission and black hole mass
• Examining AGN UV/Optical Variability Beyond the Simple Damped Random Walk. II. Insights from 22 Years Observations of SDSS, PS1 and ZTF
• Unveiling the quasar main sequence: illuminating the complexity of active galactic nuclei and their evolution
• Extreme Variability Quasars in Their Various States. II: Spectral Variation Revealed with Multi-epoch Spectra
• The intrinsic X-ray luminosity distribution of an optically-selected SDSS quasar population
• Rapid Variability of the accretion disk wind in the narrow line Seyfert 1, PG 1448+273
• A γ-ray emitting NLS1 galaxy SDSS J095909.51+460014.3 identified by multiwavelength contemporaneous brightening
• First black hole mass estimation for the quadruple lensed system WGD2038-4008
• Long-term variability of the composite galaxy SDSS J103911-000057: A candidate of true Type-2 AGN
• The composite X-ray spectrum of 3CRR Quasars
• Optical Variability Properties of Mini-BAL and NAL Quasars
• SALT long-slit spectroscopy of HE 0435-4312: fast displacement in the Mg II emission line
• The X-ray Zurich Environmental Study (X-ZENS). I. Chandra and XMM-Newton observations of AGNs in galaxies in nearby groups
• A search for nontoroidal topological lensing in the Sloan Digital Sky Survey quasar catalog
• Intranight optical variability of radio-loud broad absorption line quasars
• Kinetic power of quasars and statistical excess of MOJAVE superluminal motions
• Quasars with Anomalous Hβ Profiles I: Demographics
• AGNet: Weighing Black Holes with Deep Learning
• Exploring the Connection between UV/Optical Variations and Radio Emission in Radio-Quiet Quasars: Clues on Radio Emission Origin
• Astrometric Jitter as a Detection Diagnostic for Recoiling and Slingshot Supermassive Black Hole Candidates
• A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies
• HYPERION. Shedding light on the first luminous quasars: A correlation between UV disc winds and X-ray continuum
• Direct Measurement of Quasar Outflow Wind Acceleration
• An Optically Faint Quasar Survey at z~5 in the CFHTLS Wide Field: Estimates of the Black Hole Masses and Eddington Ratios
• The mid-infrared variability of the SDSS optical quasars
• The ${\sigma }_{\mathrm{H}\beta }$-based dimensionless accretion rate and its connection with the corona for AGN
• Nonparametric Methods in Astronomy: Think, Regress, Observe -- Pick Any Three
• Breaking the rules at $z\simeq$0.45: the rebel case of RBS 1055
• 2D stellar population and gas kinematics of the inner 1.5 kpc of the post-starburst quasar SDSS J0210-0903
• AGN mass estimates in large spectroscopic surveys: the effect of host galaxy light
• Spectral variability studies in Active Galactic Nuclei: Exploring continuum and emission line regions in the age of LSST and JWST
• High-$z$ Universe probed via Lensing by QSOs (HULQ) I. Number Estimates of QSO-QSO and QSO-Galaxy Lenses
• Seeking the Epoch of Maximum Luminosity for Dusty Quasars
• The physical constraints on a new LoBAL QSO at z=4.82
• Black-hole masses of type 1 AGN in the XMM-Newton bright serendipitous survey
• Location of gamma-ray flaring region in quasar 4C +21.35
• The WISSH quasars project VII. The impact of extreme radiative field in the accretion disk and X-ray corona interplay
• The near-infrared SED of blue quasars: what drives the evolution of the dusty torus?
• Variable Radio AGN at High Redshift Identified in the VLA Sky Survey
• Clustering of galaxies around AGN in the HSC Wide survey
• Constraints on black hole spins with a general relativistic accretion disk corona model
• HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe
• Spectroscopic Observations of the Outflowing Wind in the Lensed Quasar SDSS J1001+5027
• Temperature Profiles of Accretion Disks in Luminous Active Galactic Nuclei derived from Ultraviolet Spectroscopic Variability
• Monster radio jet (>66 kpc) observed in quasar at z$\sim$5
• Tracing Quasar Narrow-Line Regions Across Redshift: A Library of High S/N Optical Spectra
• Radio Dichotomy in Quasars with H$\beta$ FWHM greater than $15,000$ km\,s${}^{-1}$
• Environments of Strong / Ultrastrong, Ultraviolet Fe II Emitting Quasars
• Modeling Star Formation Histories of Changing-Look AGN Host Galaxies with Prospector
• Signature of outflows in strong MgII absorbers in quasar sightlines
• Orientation effects on the near-infrared broad band emission of quasars
• The Performance of Photometric Reverberation Mapping at High Redshift and the Reliability of Damped Random Walk Models
• Unveiling the monster heart: unbeamed properties of blazar 4C 71.07
• BH Mass, Jet and Accretion Disk Connection: An Analysis of Radio-loud and Radio-quiet Quasars
• Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program
• Probing the He II re-Ionization ERa via Absorbing C IV Historical Yield (HIERACHY) I: A Strong Outflow from a z~4.7 Quasar
• The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 Data
• The detections of inflowing gas from narrow absorption lines at the parsec scale
• Observational window effects on multi-object Reverberation Mapping
• X-ray and Multiwavelength Insights into the Inner Structure of High-Luminosity Disc-Like Emitters
• Awakening of The High Redshift Blazar CGRaBS J0809+5341
• AGN Reverberation Mapping
• The relationship of SMBHs and host galaxies at $z<4$ in the deep optical variability-selected AGN sample in the COSMOS field
• Extinction and AGN over host galaxy contrast effects on the optical spectroscopic classification of AGN
• Sub-millimeter Detected z~2 Radio-quiet QSOs: Accurate Redshifts, Black Hole Masses, and Inflow/Outflow Velocities
• The 2175 Å~ Bump Features in FeLoBAL Quasars: One Indicator of MW-like Dust in the Nuclear Region of Quasar
• Quasar emission lines, radio structures and radio unification
• JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
• The MEXSAS2 Sample and the Ensemble X-ray Variability of Quasars
• The Variability of the Narrow-line Seyfert 1 Galaxies from the PanSTARRS's View
• Probing the Wind Component of Radio Emission in Luminous High-Redshift Quasars
• Searching for Low-Redshift Hot Dust-Obscured Galaxies
• Analysing the Suzaku Spectra of the Broad-Line Seyfert 1 Galaxy CBS 126
• Incidence of Strong MgII Absorbers Towards Different Types of Quasars
• "Zombie" or active? An alternative explanation to the properties of star-forming galaxies at high redshift
• H$\beta$ line shape and radius-luminosity relation in 2.5D FRADO
• X-ray properties of high-redshift Radio Loud and Radio Quiet Quasars observed by Chandra
• A Catalog of Post-starburst Quasars from Sloan Digital Sky Survey Data Release 7
• The relation between quasars' optical spectra and variability
• Photometric Selection of type 1 Quasars in the XMM-LSS Field with Machine Learning and the Disk-Corona Connection
• A measure of cosmological distance using the \civ\ Baldwin effect in quasars
• Hyper-massive Black Holes have Faint Broad and Narrow Emission Lines
• Selection of highly-accreting quasars: Spectral properties of FeII emitters not belonging to extreme Population A
• A Broad Absorption Line Outflow Associated with the Broad Emission Line Region in the Quasar SDSS J075133.35+134548.3
• Rarefied Broad-Line Regions in Active Galactic Nuclei: Anomalous Responses in Reverberation Mapping and Implications for Weak Emission-Line Quasars
• Black Hole masses for 14 gravitational lensed quasars
• A comparison of cosmological models with high-redshift quasars
• The Quasar 3C 47: Extreme Population B Jetted Source With Double-peaked Profile
• Measuring the Time Variation of the Fine-structure Constant with Quasars Detected by LAMOST
• The spectral variability of quasar SDSS J030639.57+000343.1
• The Detection Rate of Associated \mgii\ Absorption Lines in Quasars Depends on Their Radio Emission
• QSO MUSEUM III: the circumgalactic medium in Ly$\alpha$ emission around 120 $z\sim 3$ quasars covering the SDSS parameter space. Witnessing the instantaneous AGN feedback on halo scales
• Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
• The Galaxy Activity, Torus, and Outflow Survey (GATOS). Black hole mass estimation using machine learning
• Central Engine and Spectral Energy Distribution Properties of High Redshift Gamma Ray Blazars
• Uncertainty Quantification of the Virial Black Hole Mass with Conformal Prediction
• The comparison of optical variability of broad-line Seyfert 1 and narrow-line Seyfert 1 galaxies from the view of Pan-STARRS
• Discovering bright quasars at intermediate redshifts based on the optical/near-IR colors
• Ensemble Mapping the Inner Structure of Luminous Quasars
• Discovery of six high-redshift quasars with the Lijiang 2.4m telescope and the Multiple Mirror Telescope
• H1821+643: The most X-ray and infrared luminous AGN in the Swift/BAT survey in the process of rapid stellar and supermassive black hole mass assembly
• Properties of Very Broad Line MgII Radio-Loud and Radio-Quiet Quasars
• The black hole masses of extremely luminous radio-WISE selected galaxies
• Ultraviolet Fe II Emission in Fainter Quasars: Luminosity Dependences, and the Influence of Environments
• Fe II velocity shifts in optical spectra of type 1 AGN
• The broad band SEDs of four 'hypervariable' AGN
• HARMONI view of the host galaxies of active galactic nuclei around cosmic noon: Resolved stellar morpho-kinematics and the M${}_{BH}$-${\sigma }_{\star }$ relation
• Do Red Galaxies Form More Stars Than Blue Galaxies?
• On the Power to Constrain the Accretion History of Massive Black Holes via Spin Measurements by Upcoming X-Ray Telescopes
• The disk-torus system in active galactic nuclei: possible evidence of highly spinning black holes
• A broad-line quasar with unexplained extreme velocity offsets: post-shock outflow?
• The Nature of LoBAL QSOs: II. HST/WFC3 Observations Reveal Host Galaxies Dominated by Mergers
• Mg II line properties in lobe-dominated quasars
• The role of gas stripping in the quenching of satellite galaxies using SHARK v2.0
• The environment of QSO triplets at 1 $\lesssim$ z $\lesssim$ 1.5
• Characterisation of AGN from the XMM-Newton Slew Survey
• The Quasar Candidates Catalogs of DESI Legacy Imaging Survey Data Release 9
• 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 ?
• Flat Spectrum Radio Quasars as high-energy neutrino sources
• Deep absorption in SDSS J110511.15+530806.5
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
• Exploring the quasar disc-wind-jet connection with LoTSS and SDSS
• Modeling the Reverberation Response of the Broad Line Region in Active Galactic Nuclei II: Incorporating Photoionization Models
• Multi-phase investigation of outflows in the circumgalactic and interstellar media of luminous quasars at z~5
• Strong FeII emission in NLS1s: An unsolved mystery
• Robust AGN and host-galaxy decomposition in optical spectral fitting
• OzDES Reverberation Mapping Program: Stacking analysis with H$\beta$, Mg II and C IV
• The Energetics of the Central Engine in the Powerful Quasar, 3C298
• AGN in the ULIRG HE 0435-5304
• Cosmic quenching and scaling laws for the evolution of supermassive black holes and host galaxies
• Large-scale environments of star-forming active galactic nuclei: How black hole mass, accretion rate, and luminosity connect to dark matter halos
• NVSS J151002+570243: accretion and spin of a z > 4 Fermi detected blazar
• A stellar dynamical mass measurement of an inactive black hole at redshift 2
• AGN obscuration in optical and X-rays: Host properties and the interplay of nuclear and galactic gas and dust in a combined SDSS-XMM sample
• The ensemble broad-frequency power spectrum of Stripe-82 quasars from multiple surveys
• Broadband nuclear emission in two radio-loud BAL quasars
• DEIMOS Observations of WISE-Selected, Optically Obscured AGNs
• The physical properties of candidate neutrino-emitter blazars
• DESI Mg II Absorbers: Extinction Characteristics & Quasar Redshift Accuracy
• Spectral Energy Distribution Modeling of Broad Emission Line Quasars: From X-ray to Radio Wavelengths
• A Strange EUV Emission: Scattered Continuum in the Lymann Limit Absorption Edge toward the Quasar SDSS J125903.26+621211.5?
• Reprocessing Models for the Optical Light Curves of Hypervariable Quasars from the Sloan Digital Sky Survey Reverberation Mapping Project
• Dusty Quasars at High Redshifts
• Compton thick absorber in type 1 quasar 3C 345 revealed by Suzaku and Swift/BAT
• Hosts and environments: a (large-scale) radio history of AGN and star-forming galaxies
• Gaia-supported re-discovery of a remarkable weak line quasar from a variability and proper motion survey
• Optical Spectroscopy of Four Young Radio Sources
• Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at $z\gtrsim 6$ Shows No Evidence of Lensing
• Far-UV Fe Emission as Proxy of Eddington Ratios
• Extracting the Possible Intrinsic Relation between Radiative Efficiency and Mass of QSOs: a Maximum Likelihood Method and its Application to the SDSS DR7 QSOs
• Orientation and accretion in a representative sample of active galactic nuclei
• AGNet: Weighing Black Holes with Machine Learning
• PHL 6625: A Minor Merger-Associated QSO Behind NGC 247
• Black-hole mass estimation through accretion disk spectral fitting for high-redshift blazars
• The possible long-term periodic variability of the extremely luminous quasar WISE J090924.01+000211.1
• The first supermassive black hole mass measurement in active galactic nuclei using the polarization of broad emission line Mg II
• The dependence of the fraction of radio luminous quasars on redshift and its theoretical implications
• Narrow-line Seyfert 1s: what is wrong in a name?
• On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs
• Understanding the Nature of an Unusual Post-Starburst Quasar with Exceptionally Strong Ne V Emission
• Can X-ray Observations Improve Optical-UV-based Accretion-Rate Estimates for Quasars?
• Multi-wavelength Optical and NIR Variability Analysis of the Blazar PKS 0027-426
• Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass
• Nuclear Activity and Host Galaxy Properties of Low-Luminosity AGN Identified from VLA Observations
• Strong correlation between FeII/MgII ratio and Eddington ratio of type 1 Active galactic nuclei
• The Relationship Between Emission Line and Continuum Luminosity and the Baldwin Effect in Blazars. I. The Case of the Mg II λ2798 Å Emission Line
• The Structure and Evolution of LRDs: Insights from JWST NIRSpec Medium and High Resolution Spectroscopy at $z\sim 4$
• The imprint of AGN-driven outflows on the CGM: the case of Lyα nebulae around high-z quasars
• AGILE: an end-to-end Rubin-LSST simulation of AGNs, galaxies, and stars I. Software description and first data release
• Extreme variability quasars from the Sloan Digital Sky Survey and the Dark Energy Survey
• Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program
• Revisit the fraction of radio-loud narrow line Seyfert 1 galaxies with LoTSS DR1
• Intra-day variability of three Seyfert Galaxies measured with XMM-Newton
• Black hole mass, host galaxy mass, and dark matter halos: Testing the environmental connection
• The High-energy emission of jetted AGN
• Narrow lines correlations in an SDSS sample of type 1 quasars
• Testing [O II] $\lambda 3727$ as a Star Formation Rate Tracer in Quasar Host Galaxies
• A new model of quasar mass evolution
• Slim accretion disks: theory and observational consequences
• SDSS J153231.80+420342.7: a triple black hole candidate with a close binary black hole
• The X-ray statistical properties of dust-obscured galaxies detected by eROSITA
• OISTER Optical and Near-Infrared Monitoring Observations of a Peculiar Radio-Loud Active Galactic Nucleus SDSS J110006.07+442144.3
• 4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting
• A Treasure Hunt in the Pool of Spectra Classified as High-redshift QSOs by the Spectroscopic Pipeline of the SDSS DR16
• Estimating the spins of supermassive black holes in distant ultraluminous quasars
• Precision near-IR spectroscopy for understanding AGN physics and shed light on the H0 tension -- SHARP Science Book
• X-ray emission of radio-loud quasar SDSS J121426.52+140258.9: independent variations between optical/UV and X-ray emission
• High-$z$ Universe probed via Lensing by QSOs (HULQ) II. Deep GMOS spectroscopy of a QSO lens candidate
• Optical Variability Structure Function of Low-Luminosity AGN using ATLAS Lightcurves
• Near-infrared spectroscopy of extreme BAL QSOs from the QUBRICS bright quasar survey
• BH masses in NLS1: the role of the broad-line region geometry
• The variational slope of quasar light curves is not a distance indicator
• The physical relation between disc and coronal emission in quasars