A Composite HST Spectrum of Quasars

Abstract

We construct a composite quasar spectrum from 284 HST FOS spectra of 101 quasars with redshifts z > 0.33. The spectrum covers the wavelengths between 350 and 3000 A in the rest frame. There is a significant steepening of the continuum slope around 1050 A. The continuum between 1050 and 2200 A can be modeled as a power law with alpha = -0.99. For the full sample the power-law index in the extreme ultraviolet (EUV) between 350 and 1050 A is alpha = -1.96. The continuum flux in the wavelengths near the Lyman limit shows a depression of about 10 percent. The break in the power-law index and the slight depression of the continuum near the Lyman limit are features expected in Comptonized accretion-disk spectra.

10 figures To appear in the February 1, 1997, issue of the Ap. J

Cited by in corpus (355)

• How Do Galaxies Get Their Gas?
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Dynamics of line-driven disk winds in Active Galactic Nuclei
• On the properties of massive Population III stars and metal-free stellar populations
• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei: I. Comparing the Photoionization and Reverberation Techniques
• The Rest-Frame Extreme Ultraviolet Spectral Properties of QSOs
• An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zw 1
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• The Low Redshift Lyman Alpha Forest in Cold Dark Matter Cosmologies
• Is the soft excess in AGN real?
• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• Bolometric luminosities and Eddington ratios of X-ray selected Active Galactic Nuclei in the XMM-COSMOS survey
• The X-ray to optical-UV luminosity ratio of X-ray selected Type 1 AGN in XMM-COSMOS
• Elemental Abundances in QSOs: Star Formation and Galactic Nuclear Evolution at High Redshifts
• Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths
• Evolution of Structure in the Intergalactic Medium and the Nature of the Ly-alpha Forest
• The first ultraviolet quasar stacked spectrum at z=2.4 from WFC3
• Most Supermassive Black Holes must be Rapidly Rotating
• Zero-Metallicity Stars and the Effects of the First Stars on Reionization
• A physical model of the broadband continuum of AGN and its implications for the UV/X relation and optical variability
• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• UV/Optical Detections of Candidate Tidal Disruption Events by GALEX and CFHTLS
• Luminous Thermal Flares from Quiescent Supermassive Black Holes
• The Distribution of Metallicity in the IGM at z~2.5: OVI and CIV Absorption in the Spectra of 7 QSOs
• On the origin of radio emission in radio quiet quasars
• The Bimodal Metallicity Distribution of the Cool Circumgalactic Medium at z<1
• The Nature of the Hard X-ray Background Sources: Optical, Near-infrared, Submillimeter, and Radio Properties
• The Quasar Outflow Contribution to AGN Feedback: VLT Measurements of SDSS J0318-0600
• Dust in active nuclei. II. Powder or gravel?
• The dusty heart of nearby active galaxies -- II. From clumpy torus models to physical properties of dust around AGN
• Ultraviolet Detection of the Tidal Disruption of a Star by a Supermassive Black Hole
• A Composite Extreme Ultraviolet QSO Spectrum from the Far Ultraviolet Spectroscopic Explorer
• Quasar Accretion Disks Are Strongly Inhomogeneous
• Composite Spectra from the FIRST Bright Quasar Survey
• Resolving the obscuring torus in NGC 1068 with the power of infrared interferometry: Revealing the inner funnel of dust
• A Near-Infrared Spectral Template for Quasars
• Tracing the cosmic growth of super massive black holes to z ~ 3 with Herschel
• The Evolution of the Broad-Line Region among SDSS Quasars
• Reionization by Hard Photons: I. X-rays from the First Star Clusters
• Continuum and Emission Line Strength Relations for a large Active Galactic Nuclei Sample
• Towards a physical model of dust tori in Active Galactic Nuclei - Radiative transfer calculations for a hydrostatic torus model
• Metallicities and Abundance Ratios from Quasar Broad Emission Lines
• Heating and Ionization of the Intergalactic Medium by an Early X-Ray Background
• High-Redshift SDSS Quasars with Weak Emission Lines
• Simulations of Jets Driven by Black Hole Rotation
• Global Radiation Magneto-hydrodynamic Simulations of Sub-Eddington Accretion Disks around Supermassive Black Holes
• A combined Optical and X-ray Spectra Study for Type 1 AGN. III. Broadband SED Properties
• New synthesis models of consistent extragalactic background light over cosmic time
• The FIRST-2MASS Red Quasar Survey
• Quasars and the Big Blue Bump
• A Uniform Analysis of the Ly-alpha forest at z = 0 - 5: II. Measuring the mean intensity of the extragalactic ionizing background using the proximity effect
• Radiative Transfer Effects during Photoheating of the Intergalactic Medium
• The Obscured Fraction of AGN in the XMM-COSMOS Survey: A Spectral Energy Distribution Perspective
• Average Quasar Spectra in the Context of Eigenvector 1
• An X-shooter composite of bright 1 < z < 2 quasars from UV to infrared
• The characteristic blue spectra of accretion disks in quasars as uncovered in the infrared
• Non-LTE Models and Theoretical Spectra of Accretion Disks in Active Galactic Nuclei. III. Integrated Spectra for Hydrogen-Helium Disks
• The High-Redshift He II Gunn-Peterson Effect: Implications and Future Prospects
• Universal spectral shape of high accretion rate AGN
• Major contributor to AGN feedback: VLT X-shooter observations of SIV BAL QSO outflows
• HST STIS Ultraviolet Spectral Evidence for Outflow in Extreme Narrow-line Seyfert 1 Galaxies: I. Data and Analysis
• High-Resolution Keck Spectra of the Associated Absorption Lines in 3C 191
• Detailed Characterization of H_beta emission line profile in low z SDSS quasars
• Constraints on the production and escape of ionizing radiation from the emission-line spectra of metal-poor star-forming galaxies
• Type 1 low z AGN. I. Emission properties
• Low-Luminosity Active Galactic Nuclei: Are They UV-Faint and Radio Loud?
• The Metagalactic Ionizing Radiation Field at Low Redshift
• HST-COS Observations of AGN. II. Extended Survey of Ultraviolet Composite Spectra from 159 Active Galactic Nuclei
• Resolving the Structure of Ionized Helium in the Intergalactic Medium with the Far Ultraviolet Spectroscopic Explorer
• Comptonization in Super-Eddington Accretion Flow and Growth Timescale of Supermassive Black Holes
• Descending from on high: Lyman series cascades and spin-kinetic temperature coupling in the 21 cm line
• Extreme AGN variability: evidence of magnetically elevated accretion?
• Dynamics of Accretion Flows Irradiated by a Quasar
• Quasar Elemental Abundances at High Redshifts
• HST STIS Observations of PG 0946+301: the Highest Quality UV Spectrum of a BALQSO
• Physical Properties of the Lyman Alpha Forest in a Cold Dark Matter Cosmology
• A Principal Component Analysis of quasar UV spectra at z~3
• AGNfitter: A Bayesian MCMC approach to fitting spectral energy distributions of AGN
• Broad P V Absorption in the BALQSO, PG 1254+047: Column Densities, Ionizations and Metal Abundances in BAL Winds
• Line-driven Disk Winds in Active Galactic Nuclei: The Critical Importance of Ionization and Radiative Transfer
• A Study of the Reionization History of Intergalactic Helium with FUSE and VLT
• The Local Lyman-alpha Forest. II: Distribution of HI Absorbers, Doppler Widths, and Baryon Content
• What controls the [O III] 5007 line strength in AGN?
• Line driven winds and the UV turnover in AGN accretion discs
• The Intrinsically X-ray Weak Quasar PHL 1811. II. Optical and UV Spectra and Analysis
• Self-shadowing Effects of Slim Accretion Disks in Active Galactic Nuclei: Diverse Appearance of the Broad-line Region
• The effects of UV background correlations on LyA forest flux statistics
• Active Galactic Nuclei Emission-Line Properties Versus Eddington Ratio
• Iron Emission in z~6 QSOs
• The Fluctuating Intergalactic Radiation Field at Redshifts z = 2.3-2.9 from He II and H I Absorption towards HE 2347-4342
• A Local Baseline of the Black Hole Mass Scaling Relations for Active Galaxies. I. Methodology and Results of Pilot Study
• Type 1 AGN at low z. II. The relative strength of narrow lines and the nature of intermediate type AGN
• Probing the First Stars with Hydrogen and Helium Recombination Emission
• Radiation fields of disk, BLR and torus in quasars and blazars: implications for gamma-ray absorption
• Extremely metal-poor gas at a redshift of 7
• 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
• Emergence of a Broad-Absorption-Line Outflow in the Narrow-line Seyfert 1 Galaxy WPVS 007
• A feature at z ~ 3.2 in the evolution of the Ly-alpha forest optical depth
• Cold Accretion Disks and Lineless Quasars
• ImpZ: a new photometric redshift code for galaxies and quasars
• A Monte Carlo simulation of the intergalactic absorption and the detectability of the Lyman continuum from distant galaxies
• The Las Campanas Infrared Survey. IV. The Photometric Redshift Survey and the Rest-frame R-band Galaxy Luminosity Function at 0.5 <= z <= 1.5
• Predicting QSO Continua in the Ly Alpha Forest
• Variability Tests for Intrinsic Absorption Lines in Quasar Spectra
• Understanding the nature of FRII optical nuclei: a new diagnostic plane for radio galaxies
• Iron Opacity Bump Changes the Stability and Structure of Accretion Disks in Active Galactic Nuclei
• A Hubble Space Telescope Study of Lyman Limit Systems: Census and Evolution
• Highly Ionized High-Velocity Clouds: Hot Intergalactic Medium or Galactic Halo?
• HeII Recombination Lines From the First Luminous Objects
• Hubble Space Telescope ultraviolet spectroscopy of blazars: emission lines properties and black hole masses
• The enrichment history of the intergalactic medium: O VI in Ly-alpha forest systems at redshift z ~ 2
• Deep HeII and CIV Spectroscopy of a Giant Lyman alpha Nebula: Dense Compact Gas Clumps in the Circumgalactic Medium of a z~2 Quasar
• Highly Ionized High-Velocity Clouds toward PKS 2155-304 and Markarian 509
• Infrared spectroscopy of NGC4151: Probing the obscured ionizing AGN continuum
• A Relation Between Supermassive Black Hole Mass and Quasar Metallicity?
• Cosmological Effects of the First Stars: Evolving Spectra of Population III
• The UV peak in Active Galactic Nuclei : a false continuum from blurred reflection ?
• Mean-flux Regulated PCA Continuum Fitting of SDSS Lyman-alpha Forest Spectra
• Broad-Band Spectral Energy Distributions of Active Galactic Nuclei from an Accretion Disk with Advective Coronal Flow
• Mission: Impossible (Escape from the Lyman Limit)
• Faint AGN and the Ionizing Background
• Detection of the 2175Å~ extinction feature and 21-cm absorption in two MgII systems at z~1.3
• A probable Milli-Parsec Supermassive Binary Black Hole in the Nearest Quasar Mrk 231
• Do the Broad Emission Line Clouds See the Same Continuum that We See?
• Emission Line Properties of the Large Bright Quasar Survey
• The contribution of galaxies to the UV ionising background and the evolution of the Lyman forest
• Chemical Abundances in Broad Emission Line Regions: The "Nitrogen-Loud" QSO 0353-383
• The Spectral Slope and Escape Fraction of Bright Quasars at $z\sim 3.8$: the Contribution to the Cosmic UV Background
• Evidence for Photoionization Driven Broad Absorption Line Variability
• The UV spectrum of HS1700+6416 II. FUSE observations of the HeII Lyman alpha forest
• Mapping Low-Density Intergalactic Gas: a Third Helium Lyman-alpha Forest
• Constraints on the UV metagalactic emissivity using the LyA forest
• A Uniform Analysis of the Ly-alpha Forest at z=0 - 5: V. The extragalactic ionizing background at low redshift
• Evidence for AGN Feedback in the Broad Absorption Lines and Reddening of Mrk 231
• Photo-heating and the fate of hard photons during the reionisation of HeII by quasars
• The average absorption properties of broad absorption line quasars at 800 < lambda_rest < 3000 Å, and the underlying physical parameters
• Type 1 AGN at low z. III. The optical narrow line ratios
• The Evolution of Chemical Abundance in Quasar Broad Line Region
• Ultraviolet Extinction at High Galactic Latitudes
• Nonequilibrium ionization states and cooling rates of the photoionized enriched gas
• Evidence for a Physically Compact Narrow-Line Region in the Seyfert 1 Galaxy NGC 5548
• Coexistence of Gravitationally Bound and Radiation Driven CIV Emission Line Regions in Active Galactic Nuclei
• Correlations of Quasar Optical Spectra with Radio Morphology
• The Very Highly Ionized Broad Absorption Line System of the QSO SBS1542+541
• The near-infrared spectrum of Mrk 1239: direct evidence of the dusty torus?
• The Complete Ultraviolet Spectrum of the Archetypal "Wind-Dominated" Quasar Mrk~231: Absorption and Emission from a High-Speed Dusty Nuclear Outflow
• A Cluster of Low-Redshift Lyman-alpha Clouds toward PKS 2155-304. I. Limits on Metals and D/H
• A High Signal-to-Noise UV Spectrum of NGC 7469: New Support for Reprocessing of Continuum Radiation
• Properties of warm absorbers in active galaxies: a systematic stability curve analysis
• Five High-Redshift Quasars Discovered in Commissioning Imaging Data of the Sloan Digital Sky Survey
• The UV Properties of SDSS Selected Quasars
• Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps
• Super-Eddington QSO RX J0439.6-5311. II. Multi-wavelength Constraints on the Global Structure of the Accretion Flow
• A Multiphase Absorber Containing O VI and Broad H I Directly Tracing 10^6 K Plasma at Low-Redshift Toward HE 0153-4520
• Super- and sub-Eddington accreting massive black holes: A comparison of slim and thin accretion discs through study of the spectral energy distribution
• A search for signatures of quasar evolution: Comparison of the shapes of the rest-frame optical/UV continua of quasars at z>3 and z~0.1
• The MicroJansky Radio Galaxy Population
• Tightening Constraints from the Lyman Alpha Forest with the Flux Probability Distribution Function
• The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey
• Stellar populations and Lya emission in two lensed z>~6 galaxies
• Constraining properties of dusty environments by infrared variability
• Ultraviolet and optical properties of Narrow-Line Seyfert 1 galaxies
• FUSE Observation of the Narrow-line Seyfert 1 Galaxy RE 1034+39
• The Spectral Energy Distribution and Emission-Line properties of the NLS1 Galaxy Arakelian 564
• The Surprising Absence of Absorption in the Far-Ultraviolet Spectrum of Mrk 231
• Using [Ne V]/[Ne III] to Understand the Nature of Extreme-Ionization Galaxies
• Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
• Lyman continuum leaking AGN in the SSA22 field
• Herschel Survey of the Palomar-Green QSOs at Low Redshift
• Emission Line-Ultraviolet to X-Ray Continuum Correlations: Constraints on the Anisotropy of the Ionizing Continuum in Active Galactic Nuclei
• The Vertical Structure and Ultraviolet Spectrum of X-Ray Irradiated Accretion Disks in Active Galactic Nuclei
• The iron K feature in Narrow Line Seyfert 1's: evidence for a P Cygni profile?
• The Line-of-Sight Proximity Effect and the Mass of Quasar Host Halos
• The Narrow Line Region of Narrow-Line Seyfert 1 Galaxies
• Constraints on QSO emissivity using H I and He II Lyman alpha forest
• Multiwavelength XMM-Newton observations of the Laor et al. sample of PG quasars
• The Nature of Associated Absorption and the UV-X-ray Connection in 3C 288.1
• Non-LTE, Relativistic Accretion Disk Fits to 3C~273 and the Origin of the Lyman Limit Spectral Break
• Current and future applications of Reverberation-mapped quasars in Cosmology
• Probing Multiple Sight Lines through the SN 1006 Remnant by UV Absorption Spectroscopy
• The Ultraviolet Peak of the Energy Distribution in 3C~273: Evidence for an Accretion Disk and Hot Corona Around a Massive Black Hole
• The Nature of the Emission Components in the Quasar/NLS1 PG1211+143
• Monitoring the Variability of Intrinsic Absorption Lines in Quasar Spectra
• The evolution of the helium-ionizing background at z ~ 2-3
• Constraints from the Hubble Deep Field on High Redshift Quasar Models
• Amount of intergalactic dust: constraints from distant supernovae and thermal history of intergalactic medium
• Ultraviolet Background Radiation from Cosmic Structure Formation
• The Ly-edge paradox and the need for obscured QSOs
• New HST Observations of the Halo Gas of NGC 3067: Limits on the Extragalactic Ionizing Background at Low Redshift and the Lyman Continuum Escape Fraction
• The Probability Distribution of the Lya transmitted flux from a sample of SDSS quasars
• The Central Engines of Radio-Loud Quasars
• Cloud Formation and Acceleration in a Radiative Environment
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: A Catalogue of Strong Galaxy-Galaxy Lens Candidates
• The Lyman Continuum Escape Fraction of Galaxies and AGN in the GOODS Fields
• VLBA Observations of Sub-Parsec Structure in Mrk 231: Interaction between a Relativistic Jet and a BAL Wind
• Chemical Abundance of z~6 Quasar Broad-Line Regions in the XQR-30 Sample
• Optical and mid-infrared line emission in nearby Seyfert galaxies
• The Spectral Energy Distribution of the Seyfert galaxy Ton S180
• Constraints on the temperature inhomogeneity in quasar accretion discs from the ultraviolet-optical spectral variability
• Spectral Evolution in High Redshift Quasars from the Final BOSS Sample
• Probing the Ionizing Continuum of Narrow-Line Seyfert 1 Galaxies. I.Observational Results
• The Covering Factor of Warm Dust in Quasars: View from WISE All-Sky Data Release
• The peculiar emission line spectra of core-Extremely Red BOSS Quasars at $z\sim$2-3: orientation and/or evolution?
• Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4
• UV Spectropolarimetry of Narrow-line Radio Galaxies
• Inhomogeneous accretion discs and the soft states of black hole X-ray binaries
• Detection of the 2175 angstrom dust feature in Mg II absorption systems
• HST-COS Observations of AGNs. III. Spectral Constraints in the Lyman Continuum from Composite COS/G140L Data
• Differences Between The Optical/Uv Spectra Of X-Ray Bright And X-Ray Faint QSOs
• The buried Balmer-edge signatures from quasars
• On the Connection Between Metal Absorbers and Quasar Nebulae
• The associated system of HE2347-4342
• Discovery of an Ultraviolet Counterpart to an Ultra-Fast X-ray Outflow in the Quasar PG1211+143
• A Quasar Catalog with Simultaneous UV, Optical and X-ray Observations by Swift
• The Redshifted Excess in Quasar C IV Broad Emission Lines
• Constraint on intergalactic dust from thermal history of intergalactic medium
• Optical Variability and Colour Behaviour of 3C 345
• On the Baldwin Effect in Active Galactic Nuclei: I. The Continuum-Spectrum - Mass Relationship
• The Escape Fraction of Ionizing Radiation from Galaxies
• The OPTX Project III: X-ray versus Optical Spectral Type for AGNs
• Classification and redshift estimation by principal component analysis
• The influence of soft spectral components on the structure and stability of warm absorbers in AGN
• A universal average spectral energy distribution for quasars from optical to extreme ultraviolet
• X-ray Observations of the Seyfert galaxy LB 1727 (1H 0419-577)
• The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars
• Optical and X-ray Spectroscopy of 1E 0449.4-1823: Demise of the original type 2 QSO
• Color-redshift Relations and Photometric Redshift Estimations of Quasars in Large Sky Surveys
• The Cosmic Baryon Fraction and the Extragalactic Ionizing Background
• Towards a New Standard Model for Black Hole Accretion
• The spectral and environment properties of $z\sim 2.0-2.5$ quasar pairs
• The impact of spatial fluctuations in the ultra-violet background on intergalactic carbon and silicon
• The Fundamental Plane of QSOs and the Relationship Between Host and Nucleus
• A First Close Look at the Balmer-edge Behavior of the Quasar Big Blue Bump
• Optical integral field spectroscopy of the extended line emission around six radio-loud quasars
• The WISSH quasars project XI. The mean Spectral Energy Distribution and Bolometric Corrections of the most luminous quasars
• Black Hole Blackbodies
• Broad NeVIII 774 Emission From Quasars
• Nanodiamond dust and the far-ultraviolet quasar break
• Uncovering the Spectral Energy Distribution in Active Galaxies Using High Ionization Mid-infrared Emission Lines
• Discarding the disc in a changing state AGN: the UV/X-ray relation in NGC 4151
• Constraining the Contribution of Galaxies and Active Galactic Nuclei to Cosmic Reionization
• Polarization Insights for Active Galactic Nuclei
• Strong Ly alpha Emission in the Proximate Damped Ly alpha Absorption Trough toward the Quasar SDSS J095253.83+011422.0
• Direct determination of quasar redshifts
• Genuine Retrieval of the AGN Host Stellar Population (GRAHSP)
• New Constraints on the Quasar Broad Emission Line Region
• The Effect of Intrinsic UV Absorbers on the Ionizing Continuum and Narrow Emission Line Ratios in Seyfert Galaxies
• The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
• Evidence of the Dynamics of Relativistic Jet Launching in Quasars
• Energy distribution of individual quasars from far-UV to X-rays: I. Intrinsic UV hardness and dust opacities
• A long look at the BALQSO LBQS 2212-1759 with XMM-Newton
• The Relativistic Jet-Accretion Flow-Wind Connection in Mrk\,231
• HST emission-line images of nearby 3CR radio galaxies: two photoionization, accretion and feedback modes
• Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models
• Radio-quiet objects in the 2QZ survey
• The Subarcsecond Mid-Infrared View of Local Active Galactic Nuclei. IV. The L- and M-band Imaging Atlas
• No evidence of "gray" dust from composite quasar spectra
• The Extreme Ultraviolet Deficit and Magnetically Arrested Accretion in Radio Loud Quasars
• FUSE Observations of the Narrow-Line Seyfert 1 Galaxy Arakelian 564
• The non-constant slope of the CIV Baldwin effect in NGC 4151
• Connecting Low- and High-Redshift Weak Emission-Line Quasars via HST Spectroscopy of Ly$\alpha$ Emission
• Slicing the Torus: Obscuring Structures in Quasars
• Detection of type-2 quasars in the radio galaxies B3 0731+438 and 3C 257
• Ultraviolet Broad Absorption Features and the Spectral Energy Distribution of the QSO PG 1351+64
• Multi-Epoch Observations of the Redwing Excess in the Spectrum of 3C279
• The Metallicity of the Redshift 4.16 Quasar BR2248-1242
• The Extreme Ultraviolet Variability of Quasars
• Baldwin Effect and Additional BLR Component in AGN with Superluminal Jets
• Possible High-Redshift, Low-Luminosity AGN Activity in the Hubble Deep Field
• The He II Opacity of the Lyman-alpha Forest and the Intergalactic Medium
• The GALEX Time Domain Survey. II. Wavelength-Dependent Variability of Active Galactic Nuclei in the Pan-STARRS1 Medium Deep Survey
• Active Galactic Nuclei Selected from GALEX Spectroscopy: The Ionizing Source Spectrum at z~1
• Constraints on the densities and temperature of Seyfert 2 NLR
• Quasars as standard candles VI: spectroscopic validation of the cosmological sample
• The Correlation Between Spectral Index And Accretion Rate For AGN
• Variability of the soft X-ray excess in IRAS 13224-3809
• Constraining UV Continuum Slopes of Active Galactic Nuclei With CLOUDY Models of Broad Line Region EUV Emission Lines
• JHK Spectra of the z=2.39 Radio Galaxy 53W002
• Modeling the UBVRI time delays in Mrk 335
• PKS 1018-42: A Powerful Kinetically Dominated Quasar
• Multi-line assessment of narrow-line regions in $z\sim$ 3 radio galaxies
• The Nature of the UV/X-Ray Absorber in PG 2302+029
• Modeling the Void H I Column Density Spectrum
• On the population of primordial star clusters in the presence of UV background radiation
• Estimating the Jet Power of Mrk\,231 During the 2017-2018 Flare
• Covering factors of the dusty obscurers in radio-loud and radio-quiet quasars
• Blue, Green, and Red Bumps in AGN
• A Search for H I Lyman $\alpha$ Counterparts to Ultra-Fast X-ray Outflows
• The Average Soft X-ray Spectra of eROSITA Active Galactic Nuclei
• Radiative non-isothermal Bondi accretion onto a massive black hole
• Composite spectra of quasars with different UV spectral index
• Far-Ultraviolet Spectroscopy Of Active Galactic Nuclei With AstroSat/UVIT
• Electron Energy Distributions in the Extended Gas Nebulae associated with High-z AGN: Maxwell-Boltzmann vs. kappa distributions
• Seyfert 1 Composite Spectrum using SDSS Legacy Survey Data
• The emission line spectrum of the UV deficient quasar Ton 34: evidence of shock excitation?
• 21 cm Signals from Early Ionizing Sources
• X-Ray Microlensing of Bright Quasars
• The Highly Self-Absorbed Blazar, PKS\,1351$-$018
• Technique for detecting warm-hot intergalactic gas in quasar UV spectra
• Infrared Colours and Spectral Energy Distributions of Hard X-ray Selected Obscured and Compton-thick AGN
• Modeling the unresolved NIR-MIR SEDs of local ($z<0.1$) QSOs
• Theoretical Models of Multi-waveband QSO Luminosity Functions
• The near-infrared SED of blue quasars: what drives the evolution of the dusty torus?
• Constraints on UV Absorption in the Intracluster Medium of Abell 1030
• HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe
• The Powerful Jet and Gamma-Ray Flare of the Quasar PKS 0438$-$436
• A Second UV "Light Bulb" behind the SN 1006 Remnant
• Constraints on black hole spins with a general relativistic accretion disk corona model
• Molecular Gas Heating and Modified Dust Properties in Active Galaxies: Growing Black Holes or Tidal Shocks?
• The X-Rays wind connection in PG 2112+059
• Unveiling the monster heart: unbeamed properties of blazar 4C 71.07
• IMPETUS: New Cloudy's radiative tables for accretion onto a galaxy black hole
• EROs found behind lensing clusters. II. Stellar populations and dust properties of optical dropout EROs and comparison with related objects
• The Composite Spectral Energy Distribution of Quasars is Surprisingly Universal Since Cosmic Noon
• The unusual UV continuum of quasar Ton 34 and the possibility of crystalline dust absorption
• PKS 1622-253: A Weakly Accreting, Powerful Gamma Ray Source
• An Intercomparison Study of Two Proximate Damped Ly$\alpha$ Systems with Residual Flux upon the Ly$\alpha$ Absorption Trough toward Quasars
• Project Lyman
• Quasar spectral energy distribution in EUV restored from associated absorbers: indications to the HeII opacity of the quasar accretion disk wind
• Selection Effects in the SDSS Quasar Sample: The Filter Gap Footprint
• A search for cosmological anisotropy using the Lyman alpha forest from SDSS quasar spectra
• The Extreme Ultraviolet Spectra of Low Redshift Radio Loud Quasars
• Modeling spatially-resolved galactic H$\alpha$ emission for galaxy clustering
• The Energetics of Launching the Most Powerful Jets in Quasars: A Study of 3C82
• The AGN/Normal Galaxy Connection : Summary
• 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
• EROs found behind lensing clusters: II.Empirical properties, classification, and SED modelling based on multi-wavelength observations
• Development of Hydrogen and Helium Proximity Zones around Quasars
• AGN accretion disks as spatially resolved by polarimetry
• Spectral Energy Distribution Variations of Nearby Seyfert Galaxies During AGN Watch Monitoring Programs
• Evidence of under-developed torus and broad-line region of weak emission line quasars based on their spectral energy distribution
• Constraining X-ray emission of magnetically arrested disk (MAD) by radio-loud AGNs with extreme ultraviolet (EUV) deficit
• XMM-Newton, Swift and ROSAT observations of LBQS 0102-2713
• Quasars' Optical Polarization and Balmer Edge Feature Revealed by Ultra-Violet, and Polarized Visible to Near Infrared Emissions
• partly obscured accretion disk model to explain Shifted broad Balmer emission lines of Active Galactic Nuclei
• Spectral Signatures of Quasar Ages at z~3
• The properties of optical FeII emission lines of AGN with double-peaked broad emission lines
• The Kinetically Dominated Quasar 3C~418
• The Energetics of the Central Engine in the Powerful Quasar, 3C298
• Spectroscopic Quasar Anomaly Detection (SQuAD) I: Rest-Frame UV Spectra from SDSS DR16
• The FRII Broad Line Seyfert 1 Galaxy: PKSJ 1037-2705
• The Lyman Continuum Polarization Rise in the QSO PG 1222+228
• The Aligned z ~ 1 Radio Galaxy 3C 280
• The effect of helium reionization on the Lyman-alpha forest hydrogen flux statistics
• Optimized Spectral Energy Distribution for Seyfert Galaxies
• Spectral Energy Distributions of Active Galactic Nuclei from an Accretion Disk with Advective Coronal Flow
• A Strange EUV Emission: Scattered Continuum in the Lymann Limit Absorption Edge toward the Quasar SDSS J125903.26+621211.5?
• Early Stages of Dusty Tori: The First Infrared Spectra from a Highly Multiscale Quasar Simulation
• The unusual spectral energy distribution of LBQS 0102-2713
• Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei. IV. 5 Orphaned AGNs
• Near infrared imaging of the broad absorption line quasar BAL QSO 0134+3253
• Probing the extremes of Seyfert activity: BeppoSAX observations of Narrow-Line Seyfert 1 galaxies
• Giant radio quasars: composite optical spectra