Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships

Abstract

We present four improved empirical relationships useful for estimating the central black hole mass in nearby AGNs and distant luminous quasars alike using either optical or UV single-epoch spectroscopy. These mass-scaling relationships between line widths and luminosity are based on recently improved empirical relationships between the broad-line region size and luminosities in various energy bands and are calibrated to the improved mass measurements of nearby AGNs based on emission-line reverberation mapping. The mass-scaling relationship based on the Hbeta line luminosity allows mass estimates for low-redshift sources with strong contamination of the optical continuum luminosity by stellar or non-thermal emission, while that based on the C IV lambda 1549 line dispersion allows mass estimates in cases where only the line dispersion (as opposed to the FWHM) can be reliably determined. We estimate that the absolute uncertainties in masses given by these mass-scaling relationships are typically around a factor of 4. We include in an Appendix mass estimates for all the Bright Quasar Survey (PG) quasars for which direct reverberation-based mass measurements are not available.

48 pages including 12 figures and 7 tables. Accepted by ApJ

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• Studying the relationship between X-ray emission and accretion in AGNs using the XMM-Newton Bright Serendipitous Survey
• The mass-metallicity relation of SDSS quasars
• AGN Continuum Reverberation Mapping Based on Zwicky Transient Facility Light Curves
• The structure of the Mg II broad line emitting region in Type 1 AGNs
• Overmassive black holes in dwarf galaxies out to z$\sim$0.9 in the VIPERS survey
• Chandra monitoring of UGC 4203: the structure of the X-ray absorber
• The curious time lags of PG 1244+026: Discovery of the iron K reverberation lag
• Light bending and X-ray echoes from behind a supermassive black hole
• The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening
• CIV Black Hole Mass Measurements with the Australian Dark Energy Survey (OzDES)
• Towards equation of state of dark energy from quasar monitoring: Reverberation strategy
• Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission
• High metal content of highly accreting quasars
• The M_bh-sigma diagram, and the offset nature of barred active galaxies
• XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars
• Super-Eddington QSO RX J0439.6-5311. II. Multi-wavelength Constraints on the Global Structure of the Accretion Flow
• A Long XMM-Newton Observation of An Extreme Narrow Line Seyfert 1: PG 1244+026
• A Physical Link Between Jet Formation and Hot Plasma in Active Galactic Nuclei
• SDSS J094533.99+100950.1 - the remarkable weak emission line quasar
• The CIV Baldwin effect in QSOs from Seventh Data Release of the Sloan Digital Sky Survey
• Insights on the X-ray weak quasar phenomenon from XMM-Newton monitoring of PHL 1092
• Virial Masses of Black Holes from Single Epoch Spectra of AGN
• Radio Properties of Low Redshift Broad Line Active Galactic Nuclei
• Evidence for an intermediate line region in AGN's inner torus region and its evolution from narrow to broad line Seyfert I galaxies
• EIGER III. JWST/NIRCam observations of the ultra-luminous high-redshift quasar J0100+2802
• XMM-Newton and Chandra Spectroscopy of the Variable High-Energy Absorption of PG 1115+080: Refined Outflow Constraints
• Black Hole Masses of Intermediate-Redshift Quasars: Near Infrared Spectroscopy
• 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
• Rehabilitating CIV-based black hole mass estimates in quasars
• The dense molecular gas in the $\mathrm{z}\sim 6$ QSO SDSS J231038.88+185519.7 resolved by ALMA
• GALEX observations of quasar variability in the ultraviolet
• Revealing structure and evolution within the corona of the Seyfert galaxy I Zw 1
• The Building Up of the Black Hole Mass - Stellar Mass Relation
• No signs of star formation being regulated in the most luminous quasars at z~2 with ALMA
• Rapid "Turn-on" of type 1 AGN in a quiescent early type galaxy SDSS1115+0544
• The BH mass of nearby QSOs: a comparison of the bulge luminosity and virial methods
• Determining Quasar Black Hole Mass Functions from their Broad Emission Lines: Application to the Bright Quasar Survey
• Extending the Calibration of CIV-Based Single-Epoch Black Hole Mass Estimators for Active Galactic Nuclei
• Extreme star formation events in quasar hosts over $0.5<\text{z}<4$
• Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey
• Tests for Standard Accretion Disk Models by Variability in Active Galactic Nuclei
• A Sample of Quasars with Strong Nitrogen Emission Lines from the Sloan Digital Sky Survey
• Observational constraints on the co-evolution of supermassive black holes and galaxies
• The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region
• How does the Polar Dust affect the Correlation between Dust Covering Factor and Eddington Ratio in Type 1 Quasars Selected from the Sloan Digital Sky Survey Data Release 16?
• On the Scatter in the Radius - Luminosity Relationship for Active Galactic Nuclei
• The chemical properties of low-redshift QSOs
• Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars
• The Black Hole Masses and Eddington Ratios of Type 2 Quasars
• A Preferential Growth Channel for Supermassive Black Holes in Elliptical Galaxies at z<2
• Uncovering the host galaxy of the $\gamma$-ray-emitting narrow-line Seyfert 1 galaxy FBQS J1644+2619
• Physical properties of the first quasars
• Identification of SDSSJ141324.27+530527.0 as A New "Changing-Look" Quasar with a "Turn-on" Transition
• Is there a relationship between AGN and star formation in IR-bright AGNs?
• AT 2019avd: A novel addition to the diverse population of nuclear transients
• SDSS J102623.61+254259.5: the second most distant blazar at z=5.3
• Investigation on Young radio AGNs based on SDSS spectroscopy
• Host galaxies of bright high redshift quasars: Luminosities and colours
• Calibration and Limitations of the Mg II line-based Black Hole Masses
• Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
• The Properties of Post-Starburst Quasars Based on Optical Spectroscopy
• Hot-Dust-Poor Quasars in Mid-Infrared and Optically Selected Samples
• The Infrared Emission and Vigorous Star Formation of Low-redshift Quasars
• X-ray spectral variability in PG1535+547: the changing-look of a 'soft X-ray weak' AGN
• X-ray spectroscopic survey of highly-accreting AGN
• Synchronized Co-evolution between Supermassive Black Holes and Galaxies Over the Last Seven Billion Years as Revealed by the Hyper Suprime-Cam
• NIR spectroscopy of SDSS J0303-0019: a low luminosity, high Eddington ratio quasar at z~6
• A search for X-ray reprocessing echoes in the power spectral density functions of AGN
• Swift/UVOT grism monitoring of NGC 5548 in 2013: an attempt at MgII reverberation mapping
• Investigating the X-ray time-lags in PG 1244+026 using an extended corona model
• [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
• The orientation dependence of quasar single-epoch black hole mass scaling relationships
• Low redshift quasars in the SDSS Stripe 82. The host galaxies
• The first high-redshift changing-look quasars
• The black holes of radio galaxies during the "Quasar Era": Masses, accretion rates, and evolutionary stage
• Eddington ratio Distribution of X-ray selected broad-line AGNs at 1.0<z<2.2
• Black Hole Mass Estimates and Rapid Growth of Supermassive Black Holes in Luminous $z\sim$ 3.5 Quasars
• Jet Properties of GeV-Selected Radio-Loud Narrow-Line Seyfert 1 Galaxies and Possible Connection to Their Disk and Corona
• Discovery of 24 radio-bright quasars at $4.9\le z\le 6.6$ using low-frequency radio observations
• The Sloan Digital Sky Survey Reverberation Mapping Project: Post-Starburst Signatures in Quasar Host Galaxies at z < 1
• Flat-Spectrum Radio Quasars from SDSS DR3 Quasar Catalogue
• The phylogeny of quasars and the ontogeny of their central black holes
• An ultra-luminous quasar at z=5.363 with a ten billion solar mass black hole and a Metal-Rich DLA at z~5
• The evolution of host mass and black hole mass in QSOs from the 2dF QSO Redshift Survey
• GTC Spectra of z ~ 2.3 Quasars: Comparison with Local Luminosity Analogues
• Constraints on the broad line region from regularized linear inversion: Velocity-delay maps for five nearby active galactic nuclei
• The extent of the MgII absorbing circum-galactic medium of quasars
• Theoretical modelling of the AGN iron-line vs continuum time-lags in the lamp-post geometry
• The Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Two and Three
• Determining Inclinations of Active Galactic Nuclei Via Their Narrow-Line Region Kinematics - II. Correlation With Observed Properties
• Blazars at the Cosmic Dawn
• Current and future applications of Reverberation-mapped quasars in Cosmology
• The Sloan Digital Sky Survey Reverberation Mapping Project: Comparison of Lag Measurement Methods with Simulated Observations
• Black hole mass estimates in quasars - A comparative analysis of high- and low-ionization lines
• Metallicity in Quasar Broad Line Regions at Redshift $\sim$ 6
• The Sloan Digital Sky Survey Reverberation Mapping Project: the CIV Blueshift, Its Variability, and Its Dependence Upon Quasar Properties
• Silicate Dust in Active Galactic Nuclei
• A momentum conserving accretion disk wind in the narrow line Seyfert 1, I Zwicky 1
• Reverberation mapping of narrow-line Seyfert 1 galaxy I Zwicky 1: black hole mass
• CIV and CIII] reverberation mapping of the luminous quasar PG 1247+267
• On the cool gaseous haloes of quasars
• Ultraviolet variability of quasars: dependence on the accretion rate
• The dust-gas AGN torus as constrained from X-ray and mid-infrared observations
• Spectral Energy Distributions of Type 1 AGN in XMM-COSMOS Survey II - Shape Evolution
• Super-Eddington Accretion in the WISE-Selected Extremely Luminous Infrared Galaxy W2246-0526
• Disk, merger, or outflow ? Molecular gas kinematics in two powerful obscured QSOs at z>3.4
• X-Ray Absorption and an X-Ray Jet in the Radio-Loud Broad Absorption Line Quasar PG 1004+130
• The mass of the black hole in RE J1034+396
• A Non-parametric Approach to Constrain the Transfer Function in Reverberation Mapping
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine
• The peculiar optical spectrum of 4C+22.25: Imprint of a massive black hole binary?
• A New Black Hole Mass Estimate for Obscured Active Galactic Nuclei
• JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST
• MgII Line Variability of High Luminosity Quasars
• Evidence for an Optical Low-frequency Quasi-Periodic Oscillation in the Kepler Light Curve of an Active Galaxy
• The Black Hole Mass - Stellar Velocity Dispersion Relationship for Quasars in the Sloan Digital Sky Survey Data Release 7
• Overmassive black holes at cosmic noon: linking the local and the high-redshift Universe
• Blazar candidates beyond redshift 4 observed with GROND
• Optical and radio properties of giant radio quasars: Central black hole characteristics
• How to constrain mass and spin of supermassive black holes through their disk emission
• X-ray observational signature of a black hole accretion disc in an active galactic nucleus RXJ1633+4718
• Can we improve CIV-based single epoch black hole mass estimations?
• The evolutionary connection between QSOs and SMGs: molecular gas in far-infrared luminous QSOs at z ~ 2.5
• The Close AGN Reference Survey (CARS): IFU survey data and the BH mass dependence of long-term AGN variability
• Extreme quasars at high redshift
• Obscured GOODS AGN and Their Host Galaxies at z < 1.25: The Slow Black Hole Growth Phase
• Stability of the Broad Line Region Geometry and Dynamics in Arp 151 Over Seven Years
• BASS XXIX: The near-infrared view of the BLR: the effects of obscuration in BLR characterisation
• Eddington ratios of faint AGN at intermediate redshift: Evidence for a population of half-starved black holes
• Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
• A comparative analysis of virial black-hole mass estimates of moderate-luminosity active galactic nuclei using Subaru/FMOS
• The Large Sky Area Multi-Object Fiber Spectroscopic Telescope Quasar Survey: Quasar Properties from First Data Release
• The Sloan Digital Sky Survey Reverberation Mapping Project: An Investigation of Biases in CIV Emission-Line Properties
• X-ray Observations of a $z\sim 6.2$ Quasar/Galaxy Merger
• The FeII/MgII flux ratio of low-luminosity quasars at z~3
• Probing the Origin of Changing-look Quasar Transitions with Chandra
• 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 Diverse Morphology, Stellar Population, and Black Hole Scaling Relations of the Host Galaxies of Nearby Quasars
• H0LiCOW VI. Testing the fidelity of lensed quasar host galaxy reconstruction
• Radiative Efficiency of Disk Accretion in Individual SDSS QSOs
• Intrinsic Absorption Properties in Active Galaxies Observed with the Far Ultraviolet Spectroscopic Explorer
• A significant excess in major merger rate for AGNs with the highest Eddington ratios at z<0.2
• Extended emission-line regions in low-redshift quasars: Dependence on nuclear spectral properties
• A quasar-galaxy merger at $z\sim 6.2$: black hole mass and quasar properties from the NIRSpec spectrum
• The Optical and Ultraviolet Emission-Line Properties of Bright Quasars with Detailed Spectral Energy Distributions
• X-ray Spectral and Variability Properties of Low-Mass AGN
• The nature of the intranight variability of radio-quiet quasars
• Extending Virial Black Hole Mass Estimates to Low-Luminosity or Obscured AGN: the cases of NGC 4395 and MCG -01-24-012
• Novel calibrations of virial black hole mass estimators in active galaxies based on X-ray luminosity and optical/NIR emission lines
• The eROSITA Final Equatorial-Depth Survey (eFEDS): A multiwavelength view of WISE mid-infrared galaxies/active galactic nuclei
• Probing the origin of low-frequency radio emission in PG quasars with the uGMRT -- I
• High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multi-Epoch Spectroscopy
• A Herschel Study of 24 micron-Selected AGNs and Their Host Galaxies
• Photo-centric variability of quasars caused by variations in their inner structure: Consequences on Gaia measurements
• Close companions to two high-redshift quasars
• Differential interferometry of QSO broad line regions I: improving the reverberation mapping model fits and black hole mass estimates
• Accretion Properties of A Sample of Hard X-ray (<60keV) Selected Seyfert 1 Galaxies
• Masses and Accretion Rates of Supermassive Black Holes in Active Galactic Nuclei from the INTEGRAL Survey
• Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3
• Discovery of an Overdensity of Lyman-alpha Emitters Around a $\mathrm{z}\sim 4$ QSO with the Large Binocular Telescope
• 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
• A Lyα blob and zabs {\approx} zem damped Lyα absorber in the dark matter halo of the binary quasar Q 0151+048
• Revisit the fundamental plane of black-hole activity from sub-Eddington to quiescent state
• Parsec-scale Dusty Winds in Active Galactic Nuclei: Evidence for Radiation Pressure Driving
• The WISSH quasars project V. ALMA reveals the assembly of a giant galaxy around a z=4.4 hyper-luminous QSO
• Variable Reddening and Broad Absorption Lines in the Narrow-line Seyfert 1 Galaxy WPVS 007: an Origin in the Torus
• A Luminous Transient Event in a Sample of WISE-Selected Variable AGN
• NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
• Ultraviolet Continuum Color Variability of Luminous Sloan Digital Sky Survey QSOs
• The Origin and Evolution of \civ Baldwin Effect in QSOs from the Sloan Digital Sky Survey
• SDSS 0956+5128: A Broad-line Quasar with Extreme Velocity Offsets
• The X-ray Power Spectral Density Function and Black Hole Mass Estimate for the Seyfert AGN IC 4329a
• The relativistic jet and its central engine of $Fermi$ blazars
• NuSTAR perspective on high-redshift MeV blazars
• Coronal Line Forest AGN I: physical properties of the emission-line regions
• Hibernating black holes revealed by photometric mass functions
• HST-COS Observations of AGNs. III. Spectral Constraints in the Lyman Continuum from Composite COS/G140L Data
• A multi-epoch spectroscopic study of the BAL quasar APM 08279+5255 II. Emission- and absorption-line variability time lags
• Flare-like Variability of the Mg~II $\lambda$2798 Å Emission Line and UV Fe~II band in the Blazar CTA~102
• Interpretation of Departure from the Broad Line Region Scaling in Active Galactic Nuclei
• Extreme Gaseous Outflows in Radio-Loud Narrow-Line Seyfert 1 Galaxies
• Discovery of the Transition of a Mini-Broad Absorption Line into Broad Absorption in the SDSS Quasar J115122.14+020426.3
• Herschel observed Stripe 82 quasars and their host galaxies: connections between the AGN activity and the host galaxy star formation
• Near-IR spectroscopy of luminous LoBAL quasars at 1<z<2.5
• Post-Starburst Quasars: Bridging the Gap Between Post-Starburst Galaxies and Quasars
• A Quasar-Galaxy Mixing Diagram: Quasar Spectral Energy Distribution Shapes in the Optical to Near-Infrared
• A Microlensing Accretion Disk Size Measurement in the Lensed Quasar WFI 2026-4536
• A Quasar Catalog with Simultaneous UV, Optical and X-ray Observations by Swift
• Multiwavelength variability study and search for periodicity of PKS 1510-089
• Modeling accretion disk emission with generalized temperature profile and its effect on AGN spectral energy distribution
• The Redshifted Excess in Quasar C IV Broad Emission Lines
• The awakening of the gamma-ray narrow-Line Seyfert 1 galaxy PKS 1502+036
• SDSS J1056+5516: A Triple AGN or an SMBH Recoil Candidate?
• Scatter Analysis Along the Multidimensional Radius-Luminosity Relations for Reverberation-Mapped Mg II Sources
• Exploring the Diversity of Type 1 Active Galactic Nuclei Identified in SDSS-IV/SPIDERS
• Acceleration and cooling of the corona during X-ray flares from the Seyfert galaxy I Zw 1
• Ultraviolet Emission-Line Correlations in Hubble/COS Spectra of Active Galactic Nuclei: Single-Epoch Black Hole Masses
• VLBI Observations of a sample of Palomar-Green quasars I: parsec-scale morphology
• Physical Properties of Luminous Dust Poor Quasars
• Discovery of Extremely Broad Balmer Absorption Lines in SDSS J152350.42+391405.2
• Evolution of quasar stochastic variability along its main sequence
• Black-hole mass estimates for a homogeneous sample of bright flat-spectrum radio quasars
• Confronting X-ray Emission Models with the Highest-Redshift Kiloparsec-scale Jets: the z=3.89 Jet in Quasar 1745+624
• Empirical Links between XRB and AGN accretion using the complete z<0.4 spectroscopic CSC/SDSS Catalog
• Constraining the quasar population with the broad-line width distribution
• Survey of Extremely High-velocity Outflows in Sloan Digital Sky Survey Quasars
• Disk-Jet Connection in Active Supermassive Black Holes in the Standard Accretion Disk Regime
• X-ray spectral variability in NGC 3783
• Studying X-ray reprocessing and continuum variability in quasars: PG 1211+143
• The behavior of quasar C IV emission-line properties with orientation
• Demographics of z ~ 6 Quasars in the Black Hole Mass-Luminosity Plane
• Probing the M-sigma Relation in the Non-Local Universe Using Red QSOs
• A Candidate Kiloparsec-scale Quasar Pair at $z=5.66$
• Panchromatic Properties of the Extreme FeII Emitter PHL 1092
• High Energy spectra of Seyferts and Unification schemes
• Looking for blazars in a sample of unidentified high-energy emitting Fermi sources
• Spectropolarimetric Observations of Active Galactic Nuclei with the 6-m BTA Telescope
• SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-ray Variability
• The evolution of the heaviest super-massive black-holes in jetted AGNs
• J004457+4123 (Sharov 21): not a remarkable nova in M31 but a background quasar with a spectacular UV flare
• The optical spectrum of PKS 1222+216 and its black hole mass
• Unusual Double-peaked Emission in the SDSS Quasar J093201.60+031858.7
• Calibrating Mg II-based black-hole mass estimators using Low-to-High-Luminosity Active Galactic Nuclei
• Characterizing Quasar CIV Emission-line Measurements from Time-resolved Spectroscopy
• A long hard look at the minimum state of PG 2112+059 with XMM-Newton
• The PG-RQS survey. Building the radio spectral distribution of radio-quiet quasars. I. The 45-GHz data
• Prior-Informed AGN-Host Spectral Decomposition Using PyQSOFit
• Speed limits for radiation driven SMBH winds
• Possible ~0.4 hour X-ray quasi-periodicity from an ultrasoft active galactic nucleus
• The Ultraviolet/optical variability of steep-spectrum radio quasars: the change in accretion rate ?
• Chandra Survey of Nearby Galaxies: Testing the Accretion Model for Low-luminosity AGNs
• A Survey for High-redshift Gravitationally Lensed Quasars and Close Quasars Pairs. I. the Discoveries of an Intermediately-lensed Quasar and a Kpc-scale Quasar Pair at $z\sim 5$
• Discovery of the luminous X-ray ignition eRASSt J234402.9$-$352640; I. Tidal disruption event or a rapid increase in accretion in an active galactic nucleus?
• The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust
• Gravitational Redshift of Emission Lines in the AGN Spectra
• A Study of Outflows in Luminous Quasars at Redshift $\sim 0.4-0.8$
• On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin-Mass Plane
• Extreme variability in an active galactic nucleus: Gaia16aax
• Reaching the Peak of the quasar spectral energy distribution - II. Exploring the accretion disc, dusty torus and host galaxy
• Modelling photometric reverberation data -- a disk-like broad-line region and a potentially larger black hole mass for 3C120
• Outflows, Shocks and Coronal Line Emission in a Radio-Selected AGN in a Dwarf Galaxy
• Systematic Redshift of the Fe III UV Lines in Quasars. Measuring Supermassive Black Hole Masses under the Gravitational Redshift Hypothesis
• The Sloan Digital Sky Survey Reverberation Mapping Project: Quasar Host Galaxies at $z<0.8$ from Image Decomposition
• An FMOS Survey of moderate-luminosity broad-line AGN in COSMOS, SXDS and E-CDF-S
• High-redshift blazars through nustar eyes
• Kinetically Dominated FRII Radio Sources
• Multi-wavelength Variability of the Broad Line Radio Galaxy 3C 120
• SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
• Dating individual quasars with the HeII proximity effect
• Modelling the AGN broad line region using single-epoch spectra II. Nearby AGN
• On the cosmological evolution of the black hole - host galaxy relation in quasars
• Near Infrared Spectra and Intrinsic Luminosities of Candidate Type II Quasars at 2 < z < 3.4
• The long-term centimeter variability of active galactic nuclei: A new relation between variability timescale and accretion rate
• An X-ray view of central engines of low luminosity quasars (LLQSO) in the local Universe
• An extended size-luminosity relation for the reverberation-mapped AGNs: the role of the accretion rate
• Reverberation Mapping of the Intermediate Mass Nuclear Black Hole in SDSS J114008.71+030711.4
• Evidence for higher black hole spin in radio-loud quasars
• Estimating AGN Black Hole Masses via Continuum Reverberation Mapping in the Era of LSST
• 3C 57 as an Atypical Radio-Loud Quasar: Implications for the Radio-Loud/Radio-Quiet Dichotomy
• Physical parameters of active galactic nuclei derived from properties of jet geometry transition region
• A Uniform History for Galaxy Evolution
• Orientation and quasar black hole mass estimation
• Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at $|b|<20°$
• A Suzaku Observation of Mkn 590 Reveals a Vanishing Soft Excess
• Determination of magnetic field strength on the event horizon of supermassive black holes in active galactic nuclei
• Subaru Hyper Suprime-Cam View of Quasar Host Galaxies at z < 1
• Resolving the Interstellar Medium in Ultraluminous Infrared QSO Hosts with ALMA
• The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys
• Detection of faint broad emission lines in type 2 AGN: III. On the $M_{BH}-{\sigma }_{\star }$ relation of type 2 AGN
• Optical emission line properties of a sample of the broad-line AGNs: the Baldwin effect and eigenvector 1
• Biases in the Quasar Mass-Luminosity Plane
• The X-ray Power Spectral Density Function of the Seyfert Active Galactic Nucleus NGC 7469
• Host Galaxies of z=4 Quasars
• Downsizing of supermassive black holes from the SDSS quasar survey (II). Extension to z~4
• Variability of Moderate Luminosity Active Galactic Nuclei at z=0.36
• A comparison of X-ray photon indices among the narrow and broad-line Seyfert 1 galaxies
• GA-NIFS and EIGER: A merging quasar host at z=7 with an overmassive black hole
• Interpreting broad emission-line variations II: Tensions between luminosity, characteristic size and responsivity
• A new method to obtain the Broad Line Region size of high redshift quasars
• Microlensing Constraints on Broad Absorption and Emission Line Flows in the Quasar H1413+117
• High Eddington quasars as discovery tools: current state and challenges
• The accretion of a solar mass per day by a 17-billion solar mass black hole
• The UV--mid-IR Spectral Energy Distribution of a z=1.7 Quasar Host Galaxy
• Chemical enrichment and accretion of nitrogen-loud quasars
• 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?
• Resolving the Inner Structure of QSO Discs by Fold Caustic Crossing Events
• 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
• SDSS J0159 as an outlier in the Mbh-sigma space: further clues to support a central tidal disruption event?
• The environment of weak emission-line quasars
• The Blueshift Of Civ Broad Emission Line In Qsos
• An extremely X--ray weak blazar at z=5
• Discovery and origins of giant optical nebulae surrounding quasar PKS 0454-22
• Black Hole Mass Estimation: How good is the virial estimate?
• The Hunt for Red Quasars: Luminous Obscured Black Hole Growth Unveiled in the Stripe 82 X-ray Survey
• Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies: Past, Present, and Future
• Suzaku Observation of the Brightest Broad-Line Radio Galaxy 4C 50.55 (IGR J 21247+5058)
• H$\alpha$ Reverberation Mapping of the Intermediate-Mass Active Galactic Nucleus in NGC 4395
• A falling Corona model for the anomalous behavior of the broad emission lines in NGC 5548
• Detection of a variable ultra-fast outflow in the Narrow Line Seyfert 1 galaxy PG 1448+273
• The miniJPAS survey: AGN & host galaxy co-evolution of X-ray selected sources
• M_BH - sigma relation in SDSS flat-spectrum radio quasars
• Faint COSMOS AGN at z~3.3 - I. Black Hole Properties and Constraints on Early Black Hole Growth
• The Quasar Mass-Luminosity Plane II: High Mass Turnoff Evolution and a Synchronization Puzzle
• LBQS 0103-2753: A Binary Quasar in a Major Merger
• Dust-driven wind as a model of Broad Absorption Line quasars
• Quasar Factor Analysis -- An Unsupervised and Probabilistic Quasar Continuum Prediction Algorithm with Latent Factor Analysis
• The transient event in NGC 1566 from 2017 to 2019 -- I. An eccentric accretion disk and a turbulent, disk-dominated broad-line region unveiled by double-peaked Ca II and O I lines
• A longer XMM-Newton look at I Zwicky 1: Distinct modes of X-ray spectral variability
• Quenching of supermassive black hole growth around the apparent maximum mass
• The Extreme Super-Eddington NLS1 RX J0134.2-4258 -- II. A Weak-Line Seyfert Linking to the Weak-Line Quasar
• High-redshift quasars along the Main Sequence
• Locating Star-Forming Regions in Quasar Host Galaxies
• TRINITY II: The Luminosity-dependent Bias of the Supermassive Black Hole Mass--Galaxy Mass Relation for Bright Quasars at $z=6$
• A note on black hole masses estimated by the second moment in Narrow Line Seyfert 1 Galaxies
• The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
• Systematically smaller single-epoch quasar black hole masses using a radius-luminosity relationship corrected for spectral bias
• Does the X-ray emission of the luminous quasar RBS 1124 originate in a mildly relativistic outflowing corona?
• Tully-Fisher Distances and Dynamical Mass Constraints for 24 Host Galaxies of Reverberation-Mapped AGN
• The Effect of Variability on the Estimation of Quasar Black Hole Masses
• The X-ray continuum time-lags and intrinsic coherence in AGN
• The underlying driver for the \civ Baldwin effect in QSOs with $0<z<5$
• The Origins of a Rich Absorption Line Complex in a Quasar at Redshift 3.45
• Do quasar broad-line velocity widths add any information to virial black hole mass estimates?
• Discovery of merging twin quasars at z = 6.05
• The z=0.54 LoBAL Quasar SDSS J085053.12+445122.5: II. The Nature of Partial Covering in the Broad-Absorption-Line Outflow
• Relation between the variations in the MgII $\lambda 2798$ emission-line and the 3000 Å continuum
• A new discovery space opened by eROSITA: Ionised AGN outflows from X-ray selected samples
• 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
• A Polarimetric Method for Measuring Black Hole Masses in Active Galactic Nuclei
• An evolutionary missing link? A modest-mass early-type galaxy hosting an over-sized nuclear black hole
• A very bright i=16.44 quasar in the `redshift desert' discovered by LAMOST
• Discovery of Two Spectroscopically Peculiar, Low-Luminosity Quasars at z~4
• Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models
• A 6.4yr optical quasi-periodic oscillations in SDSS J075217.84+193542.2: a new candidate for central binary black hole system
• Rest-frame optical properties of luminous, radio-selected, broad absorption line quasars
• Microlensing Evidence for Super-Eddington Disc Accretion in Quasars
• Relativistic redshifts in quasar broad lines
• The optical variability of steep-spectrum radio quasars in the SDSS Stripe 82 region
• Simultaneous detection and analysis of optical and ultraviolet broad emission lines in quasars at z~2.2
• JWST ERS Program Q3D: The pitfalls of virial BH mass constraints shown in a z = 3 quasar with an ultramassive host
• Nicmos Polarimetry of "Polar Scattered" Seyfert 1 Galaxies
• The Stellar Mass - Black Hole Mass Relation at $z\sim 2$ Down to ${\mathcal{M}}_{\mathrm{BH}}\sim 10^7{M}_{\odot }$ Determined by HETDEX
• The supermassive black hole masses of reverberation-mapped active galactic nuclei
• TXS 2116$-$077: A Gamma-ray Emitting Relativistic Jet Hosted in a Galaxy Merger
• OzDES Reverberation Mapping Program: Lag recovery reliability for 6-year CIV analysis
• Single-Epoch Black Hole Mass Estimators For Broad-Line Active Galactic Nuclei: Recalibrating Hbeta with A New Approach
• The preferentially magnified active nucleus in IRAS F10214+4724 - III. VLBI observations of the radio core
• The intermediate-ionization lines as virial broadening estimators for Population A quasars
• Chemical abundances along the quasar main sequence
• Properties of long-term optical variability of active galactic nuclei with double-peaked broad low-ionization emission lines
• Characterization of a sample of intermediate-type AGN. I. Spectroscopic properties and serendipitous discovery of new Dual AGN
• Constraints on accretion disk size in the massive type 1 quasar PG 2308+098 from optical continuum reverberation lags
• VLT/UVES Observation of the SDSS J2357-0048 Outflow
• Virilization of the Broad Line Region in Active Galactic Nuclei - connection between shifts and widths of broad emission lines
• The central engine of the highest redshift blazar
• Estimating supermassive black hole masses in AGNs using polarization of broad MgII, H$\alpha$ and H$\beta$ lines
• Unveiling the hosts of parsec-scale massive black hole binaries: morphology and electromagnetic signatures
• H$\beta$ Line Widths as an Orientation Indicator for Low-Ionization Broad Absorption Line Quasars
• Measuring the luminosity and virial black hole mass dependence of quasar-galaxy clustering at z ~ 0.8
• Estimators of Bolometric Luminosity and Black Hole Mass with Mid-infrared Continuum Luminosities for Dust-obscured Quasars: Prevalence of Dust-obscured SDSS Quasars
• Mid-Infrared Selected Quasars I: Virial Black Hole Mass and Eddington Ratios
• The Accuracy of Supermassive Black Hole Masses Determined by the Single-Epoch-Spectrum (Dibai) Method
• The black hole - host galaxy relation for very low-mass quasars
• Galactic Winds across the Gas-Rich Merger Sequence: I. Highly Ionized N V and O VI Outflows in the QUEST 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
• The rest-frame UV-to-optical spectroscopy of APM 08279+5255 - BAL classification and black hole mass estimates
• The Most Massive Active Galactic Nuclei at $1\lesssim z\lesssim 2$
• A single radio-emitting nucleus in the dual AGN candidate NGC 5515
• Resolving the dynamical mass of a z~1.3 QSO host galaxy using SINFONI and Laser Guide Star assisted Adaptive Optics
• A Big Red Dot: Scattered light, host galaxy signatures and multi-phase gas flows in a luminous, heavily reddened quasar at cosmic noon
• Absorption features in the quasar HS 1603+3820 II. Distance to the absorber from photoionisation modelling
• Extending the Eigenvector 1 Space to the Optical Variability of Quasars
• Chandra and XMM-Newton view of the Warm Absorbing Gas in Mrk 290
• UV-Luminous, Star-Forming Hosts of z~2 Reddened Quasars in the Dark Energy Survey
• A Candidate Tidal Disruption Event in a Quasar at z=2.359 from Abundance Ratio Variability
• Probing the disk-corona systems and broad line regions of changing-look quasars with X-ray and optical observations
• The origin of the soft X-ray excess in the narrow-line Seyfert 1 galaxy SBS 1353+564
• Strong Response of the very broad h$\beta$ Emission Line in Luminous Radio-Quite Quasar pg1416-129
• 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
• The Sloan Digital Sky Survey Reverberation Mapping Project: Biases in z>1.46 Redshifts due to Quasar Diversity
• Providing stringent star formation rate limits of z$\sim$2 QSO host galaxies at high angular resolution
• Correlated time variability of multi-component high velocity outflows in J162122.54+075808.4
• A catalog of quasar properties from the Baryon Oscillation Spectroscopic Survey
• The redshift and broad band spectral energy distribution of NRAO 150
• On the Performance of Quasar Reverberation Mapping in the Era of Time-Domain Photometric Surveys
• UM 625 Revisited: Multiwavelength Study of A Seyfert 1 Galaxy with a Low-mass Black Hole
• Broad-line region configuration of the supermassive binary black hole candidate PG1302-102 in the relativistic Doppler boosting scenario
• XMM-Newton observations of 4 luminous radio-quiet AGN, and the soft X-ray excess problem
• Extremely Massive Quasars are not Good Proxies for Dense Environments Compared to Massive Galaxies: Environments of Extremely Massive Quasars and Galaxies
• The fall of CSS100217: a tidal disruption-induced low state in an apparently hostless active galactic nucleus
• SHELLQs. Bridging the Gap: JWST Unveils Obscured Quasars in the Most Luminous Galaxies at z > 6
• Kinematics of the H$\alpha$ and H$\beta$ broad line region in an SDSS sample of type 1 AGNs
• A 3.8yr optical quasi-periodic oscillations in blue quasar SDSS J132144+033055 through combined light curves from CSS and ZTF
• TXS 1206+549: a new $\gamma$-ray detected narrow-line Seyfert 1 galaxy at redshift 1.34?
• The Complex Gaseous and Stellar environments of the nearby dual AGN Mrk 739
• Lensed Quasar Hosts
• Black hole masses of weak emission line quasars based on continuum fit method
• Near-infrared spectroscopy of a nitrogen-loud quasar SDSS J1707+6443
• Down-the-barrel observations of a multiphase quasar outflow at high redshift: VLT/X-shooter spectroscopy of the proximate molecular absorber at z=2.631 towards SDSS J001514+184212
• AGNs at the cosmic dawn: predictions for future surveys from a $\Lambda$CDM cosmological model
• Extreme nature of four blue-excess dust-obscured galaxies revealed by optical spectroscopy
• A note on periodicity of long-term variations of optical continuum in active galactic nuclei
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• The missing FeII bump in faint JWST AGN: possible evidence for metal-poor broad-line regions at early cosmic times
• Reverberation Mapping of PG 0934+013 with the Southern African Large Telescope
• Probing black hole accretion in quasar pairs at high redshift
• High Mass Flow Rate in a BAL Outflow of Quasar SDSS J1130+0411
• X-ray illuminated accretion discs and quasar microlensing disc sizes
• Modelling the AGN broad line region using single-epoch spectra I. The test case of Arp 151
• 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
• Rest-frame UV single-epoch black hole mass estimates of low-luminosity AGN at intermediate redshifts
• A Little Red Dot at $\mathbf{z}=7.3$ within a Large Galaxy Overdensity
• Estimating Black Hole Masses in Hundreds of Quasars
• Locating positions of γ-ray--emitting regions in blazars
• The Mid-Infrared Narrow Line Baldwin Effect Revealed by Spitzer
• CIV emission line properties and uncertainties in black hole mass estimates of z ~ 3.5 quasars
• A correlation between the stellar and [Fe II] velocity dispersions in Active Galaxies
• MALS SALT-NOT survey of MIR-selected powerful radio-bright AGN at 0<z<3.5
• A catalog of optical to X-ray spectral energy distributions of z~2 quasars observed with Swift. I: First results
• Statistical analysis of AlIII 1860 and CIII] 1909 emission lines as virial black hole mass estimators in quasars
• A powerful (and likely young) radio-loud quasar at z=5.3
• Wavelet spectral timing: X-ray reverberation from a dynamic black hole corona hidden beneath ultrafast outflows
• Spatially resolved Lyman-$\alpha$ emission around radio bright quasars
• SDSS J154751.94+025550 with double-peaked broad Hβbut single-peaked broad Hα: a candidate for central binary black hole system?
• Spectroscopy of broad absorption line quasars at $3\lesssim z\lesssim 5$ -- I: evidence for quasar winds shaping broad/narrow emission line regions
• The multi-epoch X-ray tale of I Zwicky 1 outflows
• Jets, black holes and disks in blazars
• Estimating black hole masses: Accretion disk fitting versus reverberation mapping and single epoch
• Probing spectral properties of radio-quiet quasars searched for optical microvariability
• Linear Spectropolarimetric Analysis of Fairall 9 with VLT/FORS2
• Resolving the nano-Hz gravitational wave sky: the detectability of eccentric binaries with PTA experiments
• 2MASX J00423991+3017515: An offset active galactic nucleus in an interacting system
• A systematic study of the ultra-fast outflow responses to luminosity variations in active galactic nuclei
• Concordance between observations and simulations in the evolution of the mass relation between supermassive black holes and their host galaxies
• VLT/SINFONI study of black hole growth in high redshift radio-loud quasars from the CARLA survey
• The eROSITA Final Equatorial Depth Survey (eFEDS): the hard X-ray selected sample
• Constraining UV Continuum Slopes of Active Galactic Nuclei With CLOUDY Models of Broad Line Region EUV Emission Lines
• Black Hole Mass Estimation in Type 1 AGN: H$\beta$ vs. Mg II lines and the role of Balmer continuum
• Shining Light on Merging Galaxies I: The Ongoing Merger of a Quasar with a `Green Valley' Galaxy
• Magnetohydrodynamic DiscWinds and LineWidth Distributions.II
• Type 1 Active Galactic Nucleus Fraction in SDSS/FIRST Survey
• Low-mass Active Galactic Nuclei on the Fundamental Plane of Black Hole Activity
• Photoionization Modelling of the Giant Broad-Line Region in NGC 3998
• Investigating the radio-loud phase of broad absorption line quasars
• Joint XMM-Newton and NuSTAR observations of the reflection spectrum of III Zw 2
• A Generative Model for Quasar Spectra
• The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods
• The mineralogy of newly formed dust in active galactic nuclei
• B2 0954+25A: a typical Fermi blazar or a gamma-loud Narrow Line Seyfert 1
• Dark Energy Survey Identification of A Low-Mass Active Galactic Nucleus at Redshift 0.823 from Optical Variability
• Dynamical signature of a stellar bulge in a quasar host galaxy at $z\simeq 6$
• The ALPINE-CRISTAL-JWST Survey: Revealing Less Massive Black Holes in High-Redshift Galaxies
• ALMA 300 pc resolution imaging of a z=6.79 quasar: no evidence for supermassive black hole influence on the [C II] kinematics
• Lack of Correlations between Cold Molecular Gas and AGN Properties in Type 1 AGNs at $z\lesssim 0.5$
• Black hole virial masses from single-epoch photometry: the miniJPAS test case
• The VMC Survey -- XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
• Near-Infrared Spectroscopy of Quasars at z~3 and Estimates of Their Supermassive Black Hole Masses
• 2D stellar population and gas kinematics of the inner kiloparsec of the post-starburst quasar SDSS J0330-0532
• On the peculiar properties of the narrow-line quasar PG 1543+489
• Is there a connection between Broad Absorption Line Quasars and Narrow Line Seyfert 1 galaxies?
• Resolving the inner accretion flow towards the central supermassive black hole in SDSS J1339+1310
• Constraining broad-line regions from time lags of broad emission lines relative to radio emission
• A Study of Active Galactic Nuclei in Low Surface Brightness Galaxies with Sloan Digital Sky Survey Spectroscopy
• Characterization of a sample of intermediate-type AGN. II. Host Bulge Properties and Black Hole Mass Estimates
• Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multi-band surveys
• The nature of massive black hole binary candidates: II. Spectral energy distribution atlas
• The Circumgalactic Medium of Submillimeter Galaxies. II. Unobscured QSOs within Dusty Starbursts and QSO Sightlines with Impact Parameters below 100 Kiloparsec
• A Direct Linkage Between AGN Outflows in The Narrow-line Regions and The X-ray Emission From The Accretion disks
• Far-Ultraviolet Spectroscopy Of Active Galactic Nuclei With AstroSat/UVIT
• Circumnuclear Molecular Gas in Low-redshift Quasars and Matched Star-forming Galaxies
• Submm-bright X-ray absorbed QSOs at z~2: insights into the co-evolution of AGN and star-formation
• Three Cases of Optical Periodic Modulation in Active Galactic Nuclei
• 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
• The low-mass end of the Mbh/Mhost relation in quasars
• A SCUBA-2 850$\mu$m Survey of Heavily Reddened Quasars at z~2
• Is GN-z11 powered by a super-Eddington massive black hole?
• Characterising SMSS J2157--3602, the most luminous known quasar, with accretion disc models
• Discovery of a new extreme changing-state quasar with 4 mag variation, SDSS J125809.31+351943.0
• Gemini Near Infrared Spectrograph - Distant Quasar Survey: Prescriptions for Calibrating UV-Based Estimates of Supermassive Black Hole Masses in High-Redshift Quasars
• Multi-wavelength properties of three new radio-powerful $z\sim 5.6$ quasi-stellar objects discovered from RACS
• Quasar Host Galaxies in the FORS Deep Field
• A novel Bayesian approach for decomposing the radio emission of quasars: II. Link between quasar radio emission and black hole mass
• Spectroscopic AGN survey at $z$ $\sim$ 2 with NTT/SOFI for GRAVITY+ observations
• The optical vs. mid-infrared spectral properties of 82 Type 1 AGNs: coevolution of AGN and starburst
• SALT long-slit spectroscopy of HE 0435-4312: fast displacement in the Mg II emission line
• Comprehensive view on a $z\sim 6.5$ radio-loud QSO: from the radio to the optical/NIR to the X-ray band
• A Closer Look at Two of the Most Luminous Quasars in the Universe
• Strong Lensed QSOs with Variability Detectable by LSST: How many are there?
• Rapid Variability of the accretion disk wind in the narrow line Seyfert 1, PG 1448+273
• Optical Variability Properties of Mini-BAL and NAL Quasars
• First black hole mass estimation for the quadruple lensed system WGD2038-4008
• Variability of Broad Emission Lines in High-Luminosity,High-Redshift Quasars
• Supermassive Black Hole Mass Regulated by Host Galaxy Morphology
• Determining Quasar Orientation
• Quasars with Anomalous Hβ Profiles I: Demographics
• How Similar are the Properties of Quasars with Nearly Identical Ultraviolet Spectra?
• 3C 216: A Powerful FRII Seyfert 1 Galaxy
• Exploring the physics of the accretion and jet in nearby narrow-line Seyfert 1 galaxies
• The X-Rays wind connection in PG 2112+059
• Spectral variability studies in Active Galactic Nuclei: Exploring continuum and emission line regions in the age of LSST and JWST
• Density calculations of NGC 3783 warm absorbers using a time-dependent photoionization model
• The near-infrared SED of blue quasars: what drives the evolution of the dusty torus?
• Spectropolarimetric measurements of hidden broad lines in nearby megamaser galaxies: a lack of clear evidence for a correlation between black hole masses and virial products
• Constraints on black hole spins with a general relativistic accretion disk corona model
• The mid-infrared variability of the SDSS optical quasars
• High-$z$ Universe probed via Lensing by QSOs (HULQ) I. Number Estimates of QSO-QSO and QSO-Galaxy Lenses
• Investigating the Disk-Corona Relation in a Blue AGN Sample
• AGN mass estimates in large spectroscopic surveys: the effect of host galaxy light
• The story of Seyfert galaxy RE J2248-511: from intriguingly ultrasoft to unremarkably average
• Time lag in transient cosmic accreting sources
• Temperature Profiles of Accretion Disks in Luminous Active Galactic Nuclei derived from Ultraviolet Spectroscopic Variability
• A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies
• Detection of disk-jet co-precession in a tidal disruption event
• Tracing Quasar Narrow-Line Regions Across Redshift: A Library of High S/N Optical Spectra
• The extended narrow-line region of two type-I quasi-stellar objects
• Infrared spectroscopic confirmation of z~2 photometrically-selected obscured quasars
• Is HE 0436-4717 Anemic? A deep look at a bare Seyfert 1 galaxy
• The Quasar Mass-Luminosity Plane III: Smaller Errors on Virial Mass Estimates
• Black-hole masses of type 1 AGN in the XMM-Newton bright serendipitous survey
• Radio Dichotomy in Quasars with H$\beta$ FWHM greater than $15,000$ km\,s${}^{-1}$
• Accretion disc reverberation mapping in a high-redshift quasar
• Periodic variability of the z=2.0 quasar QSO B1312+7837
• Awakening of The High Redshift Blazar CGRaBS J0809+5341
• The Velocity Field of Quasar Broad Emission Line Gas
• Spectral Energy Distribution profiles from AGN accretion disc in multi-gap setup
• The Performance of Photometric Reverberation Mapping at High Redshift and the Reliability of Damped Random Walk Models
• Sub-millimeter Detected z~2 Radio-quiet QSOs: Accurate Redshifts, Black Hole Masses, and Inflow/Outflow Velocities
• AGN Reverberation Mapping
• Measuring the Virial Factor in SDSS DR7 AGNs with Redshifted H$\beta$ and H$\alpha$ Broad Emission Lines
• Exploring the links between quasar winds and radio emission along the Main Sequence at high redshift
• Fading Light, Fierce Winds: JWST Snapshot of a Sub-Eddington Quasar at Cosmic Dawn
• The Extreme Ultraviolet Spectra of Low Redshift Radio Loud Quasars
• Unveiling the monster heart: unbeamed properties of blazar 4C 71.07
• Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program
• Spectral principal component analysis of mid-infrared spectra of a sample of PG QSOs
• Detecting and Characterizing Young Quasars. III. The Impact of Gravitational Lensing Magnification
• The relationship of SMBHs and host galaxies at $z<4$ in the deep optical variability-selected AGN sample in the COSMOS field
• Swift Observations of the highly X-ray variable Narrow Line Seyfert 1 galaxy RX J0148.3-2758
• Remarkably high mass and high velocity dispersion of molecular gas associated with a regular, absorption-selected type-I quasar
• Quasar radiation transforms the gas in a merging companion galaxy
• JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
• Effects of ultra-fast outflows on X-ray time lags in AGN
• Multi-wavelength study of OT 081: broadband modelling of a transitional blazar
• Environments around quasars at $z\sim$3 revealed by wide-field imaging with Subaru HSC and CFHT
• SDSS spectroscopy for blazars in the $Fermi$ LAT bright AGN sample
• A candidate quadruple AGN system at $z\sim 3$
• A new approach to constraining properties of AGN host galaxies by combining image and SED decomposition: testing upon the MBH-M* relation
• Rapidly accreting black hole of the Lyα-luminous quasar PSO J006.1240+39.2219
• A Novel Test of Quasar Orientation
• Inferences on relations between distant supermassive black holes and their hosts complemented by the galaxy fundamental plane
• BAL Outflow in Quasar B0254-3327B: Analysis and Comparison with Other Extreme UV Outflows
• Spectral Energy Distribution Variations of Nearby Seyfert Galaxies During AGN Watch Monitoring Programs
• A measure of cosmological distance using the \civ\ Baldwin effect in quasars
• Quasar Host Galaxies and the $M_{SMBH}$ - ${\sigma }_{\ast }$ Relation
• Three Spectacular HII-buried-AGN Galaxies from SDSS
• RBS1423 - a new QSO with relativistic reflection from an ionised disk
• "Zombie" or active? An alternative explanation to the properties of star-forming galaxies at high redshift
• Searching for Low-Redshift Hot Dust-Obscured Galaxies
• Shedding the envelope: JWST reveals a kiloparsec-scale [OIII]-weak Balmer shell around a z=7.64 quasar
• The Galaxy Activity, Torus, and Outflow Survey (GATOS). Black hole mass estimation using machine learning
• Uncertainty Quantification of the Virial Black Hole Mass with Conformal Prediction
• Estimate of SMBH Spin for Narrow-Line Seyfert 1 Galaxies
• Optical identification of radio-loud active galactic nuclei in the ROSAT-Green-Bank sample with SDSS spectroscopy
• 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
• Black Hole masses for 14 gravitational lensed quasars
• Polarization of broad line emission from AGNs with determined virial factors
• Discovery of six high-redshift quasars with the Lijiang 2.4m telescope and the Multiple Mirror Telescope
• The Quasar 3C 47: Extreme Population B Jetted Source With Double-peaked Profile
• Discovering bright quasars at intermediate redshifts based on the optical/near-IR colors
• Effects of Biases in Virial Mass Estimation on Cosmic Synchronization of Quasar Accretion
• Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
• Constraining black hole spin in PG 1535+547 amidst complex multi-layered absorption
• Probing spectral properties of radio-quiet quasars searched for optical microvariability-II
• Do Red Galaxies Form More Stars Than Blue Galaxies?
• Decadal Variability Survey in MACSJ1149
• AGN in the ULIRG HE 0435-5304
• HARMONI view of the host galaxies of active galactic nuclei around cosmic noon: Resolved stellar morpho-kinematics and the M${}_{BH}$-${\sigma }_{\star }$ relation
• Amoeba: An AGN Model of Optical Emissions Beyond steady-state Accretion discs
• Multi-Epoch Optical Spectroscopy Variability of the Changing-Look AGN Mrk 883
• Searching for supermassive black holes binaries within SRG/eROSITA-De I: Properties of the X-ray selected candidates
• Multi-phase investigation of outflows in the circumgalactic and interstellar media of luminous quasars at z~5
• Quasar Main Sequence unfolded by 2.5D FRADO (Natural expression of Eddington ratio, black hole mass, and inclination)
• Extreme Galaxy-scale Outflows Are Frequent among Luminous Early Quasars
• Characterisation of AGN from the XMM-Newton Slew Survey
• The X-ray weakness of Little Red Dots and JWST-selected AGN: comparison with local AGN in different accretion regimes
• Robust AGN and host-galaxy decomposition in optical spectral fitting
• The Cliff: A Metal-Poor Little Red Dot Hosting an Overmassive Black Hole at $z=3.55$
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
• The $M_{\mathrm{BH}}-M_{\star }$ Relation of the hyperluminous Dust-obscured Quasars up to $z\sim 4$
• Modeling the Reverberation Response of the Broad Line Region in Active Galactic Nuclei II: Incorporating Photoionization Models
• Investigating the origin of radio emission in candidate super-Eddington accreting black holes
• Overmassive and Undermassive Massive Black Holes: The Role of Environment and Gravitational-Wave Recoils
• PHL 6625: A Minor Merger-Associated QSO Behind NGC 247
• Euclid: Discovery of 31 new quasars at $6.6<z<7.8$
• Boson Cloud Atlas: Direct mass measurements of superradiance clouds near black holes
• On the Relation between the Inclination Angle of the Accretion Disk and the Broad-line Region in Active Galactic Nuclei
• DEIMOS Observations of WISE-Selected, Optically Obscured AGNs
• Optical Spectroscopy of Four Young Radio Sources
• A stellar dynamical mass measurement of an inactive black hole at redshift 2
• Constraining Recoiling Velocities of Black Holes Ejected by Gravitational Radiation in Galaxy Mergers
• XMM-Newton spectrum of the radio-loud quasar 3C 215: slim accretion disk or SMBH binary?
• Wide Field Multiband Imaging of Low Redshift Quasar Environments
• The physical properties of candidate neutrino-emitter blazars
• Multi-wavelength Optical and NIR Variability Analysis of the Blazar PKS 0027-426
• Investigation of homogeneity and matter distribution on large scales using large quasar groups
• Intra-day variability of three Seyfert Galaxies measured with XMM-Newton
• Can X-ray Observations Improve Optical-UV-based Accretion-Rate Estimates for Quasars?
• Gravitational Wave Measurement of the $M_{\mathrm{BH}}$-$M_{\mathrm{bulge}}$ Intrinsic Scatter at High Redshift
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow
• ALMA Observations of the Sub-kpc Structure of the Host Galaxy of a z= 6.5 Lensed Quasar: A Rotationally-Supported Hyper-Starburst System at the Epoch of Reionization
• Emission-Line and Continuum Reverberation Mapping of the NLS1 Galaxy WPVS 48
• The dependence of the fraction of radio luminous quasars on redshift and its theoretical implications
• Quasar Mass Functions Across Cosmic Time
• Geometry and kinematics of the broad emission line region in the lensed quasar Q2237+0305
• Gemini Near Infrared Spectrograph$-$Distant Quasar Survey: the Chandra View
• Constraining Nuclear Molecular Gas Content with High-resolution CO Imaging of GOALS Galaxies
• Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program
• Polarization of AGN in UV Spectral Range
• Optical Variability Structure Function of Low-Luminosity AGN using ATLAS Lightcurves
• On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs
• Black hole mass, host galaxy mass, and dark matter halos: Testing the environmental connection
• Massive black holes in the first billion years with JWST
• Near-infrared spectroscopy of extreme BAL QSOs from the QUBRICS bright quasar survey
• High-$z$ Universe probed via Lensing by QSOs (HULQ) II. Deep GMOS spectroscopy of a QSO lens candidate