Eddington-limited accretion and the black hole mass function at redshift 6

Abstract

We present discovery observations of a quasar in the Canada-France High-z Quasar Survey (CFHQS) at redshift z=6.44. We also use near-IR spectroscopy of nine CFHQS quasars at z~6 to determine black hole masses. These are compared with similar estimates for more luminous Sloan Digital Sky Survey (SDSS) quasars to investigate the relationship between black hole mass and quasar luminosity. We find a strong correlation between MgII FWHM and UV luminosity and that most quasars at this early epoch are accreting close to the Eddington limit. Thus these quasars appear to be in an early stage of their life cycle where they are building up their black hole mass exponentially. Combining these results with the quasar luminosity function, we derive the black hole mass function at z=6. Our black hole mass function is ~10^4 times lower than at z=0 and substantially below estimates from previous studies. The main uncertainties which could increase the black hole mass function are a larger population of obscured quasars at high-redshift than is observed at low-redshift and/or a low quasar duty cycle at z=6. In comparison, the global stellar mass function is only ~10^2 times lower at z=6 than at z=0. The difference between the black hole and stellar mass function evolution is due to either rapid early star formation which is not limited by radiation pressure as is the case for black hole growth or inefficient black hole seeding. Our work predicts that the black hole mass - stellar mass relation for a volume-limited sample of galaxies declines rapidly at very high redshift. This is in contrast to the observed increase at 4<z<6 from the local relation if one just studies the most massive black holes.

16 pages, 10 figures, AJ in press

References in corpus (27)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• An Observational Determination of the Bolometric Quasar Luminosity Function
• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• Direct cosmological simulations of the growth of black holes and galaxies
• Biases in Virial Black Hole Masses: An SDSS Perspective
• Clustering of High Redshift ($z\ge 2.9$) Quasars from the Sloan Digital Sky Survey
• The observed ionization rate of the intergalactic medium and the ionizing emissivity at z >5: Evidence for a photon starved and extended epoch of reionization
• Formation of z ~ 6 quasars from hierarchical galaxy mergers
• The effect of radiation pressure on virial black hole mass estimates and the case of Narrow Line Seyfert 1 galaxies
• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
• Gemini Near-infrared Spectroscopy of Luminous z~6 Quasars: Chemical Abundances, Black Hole Masses, and MgII Absorption
• A Spectroscopic Survey of Redshift 1.4<z<3.0 Galaxies in the Goods-North Field: Survey Description, Catalogs, and Properties
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• On the galaxy stellar mass function, the mass-metallicity relation, and the implied baryonic mass function
• Quasars at z=6: the survival of the fittest
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• Weighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nuclei
• Cosmic Evolution of Black Holes and Spheroids. III. The M-sigma relation in the last six billion years
• Quasars Are Not Light-Bulbs: Testing Models of Quasar Lifetimes with the Observed Eddington Ratio Distribution
• Black-Hole Mass and Growth Rate at High Redshift
• Thermal Emission from Warm Dust in the Most Distant Quasars
• Probing the Evolution of IR Properties of z~6 Quasars: Spitzer Observations
• Mass Functions of the Active Black Holes in Distant Quasars from the Sloan Digital Sky Survey Data Release 3
• Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey
• Is there an upper limit to black hole masses?
• On the inconsistency between the black hole mass function inferred from M_bh-sigma and M_bh-L correlation
• The GLARE Survey II. Faint z=6 Ly-alpha Line Emitters in the HUDF

Cited by in corpus (271)

• A luminous quasar at a redshift of z = 7.085
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• The Assembly of the First Massive Black Holes
• Star Formation and Gas Kinematics of Quasar Host Galaxies at z~6: New insights from ALMA
• The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe
• The Final SDSS High-Redshift Quasar Sample of 52 Quasars at z>5.7
• The Formation and Evolution of Massive Black Holes
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Discovery of three z>6.5 quasars in the VISTA Kilo-degree Infrared Galaxy (VIKING) survey
• GA-NIFS: A massive black hole in a low-metallicity AGN at $z\sim 5.55$ revealed by JWST/NIRSpec IFS
• Cosmic microwave background bounds on primordial black holes including dark matter halo accretion
• Black Hole Growth to z = 2 - I: Improved Virial Methods for Measuring M_BH and L/L_Edd
• Blossoms from black hole seeds: properties and early growth regulated by supernova feedback
• Black hole evolution: I. Supernova-regulated black hole growth
• Evidence for non-evolving FeII/MgII ratios in rapidly accreting z~6 QSOs
• How neutral is the intergalactic medium surrounding the redshift z=7.085 quasar ULAS J1120+0641?
• Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z\sim 4-7$ Derived with the Half-Million Dropouts on the 100 deg${}^2$ Sky
• Subaru high-z exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9
• Accretion-Driven Evolution of Black Holes: Eddington Ratios, Duty Cycles, and Active Galaxy Fractions
• Bright [CII] and dust emission in three z>6.6 quasar host galaxies observed by ALMA
• Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
• The evolution of AGN across cosmic time: what is downsizing?
• The Demographics of Broad Line Quasars in the Mass-Luminosity Plane II. Black Hole Mass and Eddington Ratio Functions
• Supermassive black holes in cosmological simulations I: M_BH-M_star relation and black hole mass function
• Discovery of the First Low-Luminosity Quasar at z > 7
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• No evidence for a significant AGN contribution to cosmic hydrogen reionization
• Faint high-redshift AGN in the Chandra Deep Field South: the evolution of the AGN luminosity function and black hole demography
• The evolution of active galactic nuclei and their spins
• Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• The ASTRID simulation: the evolution of Supermassive Black Holes
• X-ray constraints on the local supermassive black hole occupation fraction
• Evidence of Gunn-Peterson damping wings in high-z quasar spectra: strengthening the case for incomplete reionization
• Discovery of eight z ~ 6 quasars from Pan-STARRS1
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 Quasars and Luminous Galaxies at 5.7 < z < 6.8
• Blowing cold flows away: the impact of early AGN activity on the formation of a brightest cluster galaxy progenitor
• Redshift 6.4 host galaxies of 10^8 solar mass black holes: low star formation rate and dynamical mass
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). VI. Black Hole Mass Measurements of Six Quasars at 6.1<z<6.7
• Quenching star formation with quasar outflows launched by trapped IR radiation
• The Demographics of Broad-Line Quasars in the Mass-Luminosity Plane. I. Testing FWHM-Based Virial Black Hole Masses
• Constraining the radio-loud fraction of quasars at z>5.5
• Constraints on X-ray Emissions from the Reionization Era
• 21 cm signal from cosmic dawn: Imprints of spin temperature fluctuations and peculiar velocities
• A Candidate of a Least-Massive Black Hole at the First 1.1 Billion Years of the Universe
• The hierarchical assembly of galaxies and black holes in the first billion years: predictions for the era of gravitational wave astronomy
• The compact, ~1 kpc host galaxy of a quasar at z=7.1
• Supermassive Seeds for Supermassive Black Holes
• Black-Hole Mass and Growth Rate at z~4.8: A Short Episode of Fast Growth Followed by Short Duty Cycle Activity
• Far-infrared and Molecular CO Emission From the Host Galaxies of Faint Quasars at z~6
• The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
• A Search for H-Dropout Lyman Break Galaxies at z~12-16
• The Subaru high-z quasar survey: discovery of faint z~6 quasars
• Black Hole and Galaxy Coevolution from Continuity Equation and Abundance Matching
• Cosmic Chronometers in the R_h=ct Universe
• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• A survey of luminous high-redshift quasars with SDSS and WISE. I. target selection and optical spectroscopy
• Dust emission in an accretion-rate-limited sample of z>6 quasars
• The X-ray properties of $z>6$ quasars: no evident evolution of accretion physics in the first Gyr of the Universe
• A Simple Model for Quasar Demographics
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) VIII. A less biased view of the early co-evolution of black holes and host galaxies
• The low-end of the black hole mass function at cosmic dawn
• Detecting and Characterizing Young Quasars I: Systemic Redshifts and Proximity Zones Measurements
• A wide dispersion in star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• On the observability of individual Population III stars and their stellar-mass black hole accretion disks through cluster caustic transits
• The Most Massive Galaxies and Black Holes Allowed by $\Lambda$CDM
• First discoveries of z~6 quasars with the Kilo Degree Survey and VISTA Kilo-Degree Infrared Galaxy survey
• The ALMA view of the high-redshift relation between supermassive black holes and their host galaxies
• The formation of massive black holes in z~30 dark matter haloes with large baryonic streaming velocities
• The Formation of the First Massive Black Holes
• Selection effects in the black hole-bulge relation and its evolution
• The discovery of a highly accreting, radio-loud quasar at z=6.82
• On the formation of the first quasars
• The Gamma-Ray Burst Hubble Diagram and Its Cosmological Implications
• Supermassive black holes formed by direct collapse of inflationary perturbations
• Observational Signatures of High-Redshift Quasars and Local Relics of Black Hole Seeds
• Massive black hole seeds born via direct gas collapse in galaxy mergers: their properties, statistics and environment
• Blazars in the early Universe
• A Comparative Analysis of the Supernova Legacy Survey Sample with ΛCDM and the $R_{\mathrm{h}}=ct$ Universe
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) III. Star formation properties of the host galaxies at $z\gtrsim 6$ studied with ALMA
• The chemical evolution of elliptical galaxies with stellar and QSO dust production
• Assessing the redshift evolution of massive black holes and their hosts
• Rest-frame Optical Spectra and Black Hole Masses of 3<z<6 Quasars
• The Role of Galaxies and AGN in Reionising the IGM - I: Keck Spectroscopy of 5 < z < 7 Galaxies in the QSO Field J1148+5251
• New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5$
• CO (2-1) Line Emission in Redshift 6 Quasar Host Galaxies
• Co-evolution of massive black holes and their host galaxies at high redshift: discrepancies from six cosmological simulations and the key role of JWST
• High-z Quasars in the R_h=ct Universe
• GA-NIFS: Black hole and host galaxy properties of two z$\simeq$6.8 quasars from the NIRSpec IFU
• X-ray emission from high-redshift miniquasars: self-regulating the population of massive black holes through global warming
• Hot Dust Clouds with Pure Graphite Composition around Type-I Active Galactic Nuclei
• On the Accretion Rates and Radiative Efficiencies of the Highest Redshift Quasars
• First Spectroscopic Study of a Young Quasar
• Eddington-Limited Accretion in z~2 WISE-selected Hot, Dust-Obscured Galaxies
• The dust content of QSO hosts at high redshift
• No evidence for enhanced [OIII] 88um emission in a z~6 quasar compared to its companion starbursting galaxy
• Probabilistic selection of high-redshift quasars
• The host galaxies and black-hole:galaxy mass ratios of luminous quasars at z~4
• New observational Constraints on the Growth of the First Supermassive Black Holes
• The Most Massive Active Black-Holes at z~1.5-3.5 Have High Spins and Radiative Efficiencies
• Simulations of the OzDES AGN Reverberation Mapping Project
• Constraints on the black hole spin in the quasar SDSS J094533.99+100950.1
• Black hole mass and Eddington ratio distribution functions of X-ray selected broad-line AGNs at z~1.4 in the Subaru XMM-Newton Deep Field
• An Introductory Review on Cosmic Reionization
• Large Scale Environment of a $z=6.61$ Luminous Quasar Probed by Ly$\alpha$ Emitters and Lyman Break Galaxies
• The Radio Scream from Black Holes at Cosmic Dawn: A Semi-Analytic Model for the Impact of Radio Loud Black-Holes on the 21 cm Global Signal
• Inferences on the Relations Between Central Black Hole Mass and Total Galaxy Stellar Mass in the high-redshift Universe
• Host galaxies of high-redshift quasars: supermassive black hole growth and feedback
• The Globular Cluster/Central Black Hole Connection in Galaxies
• AMUSE-Field I: Nuclear X-ray Properties of Local Field and Group Spheroids across the Stellar Mass Scale
• Quasar UV luminosity function evolution up to z=8
• Into the central 10 pc of the most distant known radio quasar. VLBI imaging observations of J1429+5447 at z=6.21
• The Contribution of Host Galaxies to the Infrared Energy Output of $z\gtrsim 5.0$ QUASARS
• Limits on the high redshift growth of massive black holes
• Priorities in gravitational waveforms for future space-borne detectors: vacuum accuracy or environment?
• Constraining the quasar radio-loud fraction at $z\sim 6$ with deep radio observations
• The Premature Formation of High Redshift Galaxies
• What produces the far-infrared/submm emission in the most luminous QSOs?
• No evidence of obscured, accreting black holes in most z=6 star-forming galaxies
• Discovery of 16 New z ~ 5.5 Quasars : Filling in the Redshift Gap of Quasar Color Selection
• Probing the end of reionization with the near-zones of z > 6 QSOs
• Cosmological test using the Hubble diagram of high-z quasars
• Star Formation and ISM Properties in Host Galaxies of Three Far-infrared Luminous Quasars at $z\sim 6$
• Two more, bright, z > 6 quasars from VST ATLAS and WISE
• Physical properties of the first quasars
• Discovery of A Faint Quasar at z~6 and Implications for Cosmic Reionization
• Cosmological evolution of massive black holes: effects of Eddington ratio distribution and quasar lifetime
• The Search for the Farthest Quasar: Consequences for Black Hole Growth and Seed Models
• Faint progenitors of luminous $z\sim 6$ quasars: why don't we see them?
• NuSTAR detection of the blazar B2 1023+25 at redshift 5.3
• HYPerluminous quasars at the Epoch of ReionizatION (HYPERION). A new regime for the X-ray nuclear properties of the first quasars
• An ultra-luminous quasar at z=5.363 with a ten billion solar mass black hole and a Metal-Rich DLA at z~5
• The first Super Massive Black Holes: indications from models for future observations
• Modelling the luminosities and sizes of radio galaxies: radio luminosity function at z = 6
• Supermassive black hole ancestors
• The mass assembly of high-redshift black holes
• BlueTides simulation: establishing black hole-galaxy relations at high-redshift
• Ly$\alpha$ Halos Around $z\sim 6$ Quasars
• Constraints on high-J CO emission lines in $z\sim 6$ quasars
• The effect of baryonic streaming motions on the formation of the first supermassive black holes
• Where do IceCube neutrinos come from? Hints from the diffuse gamma-ray flux
• Limits to Rest-Frame Ultraviolet Emission From Far-Infrared-Luminous z~6 Quasar Hosts
• A quasar-galaxy merger at $z\sim 6.2$: black hole mass and quasar properties from the NIRSpec spectrum
• Constraining Quasar and IGM Properties Through Bubble Detection in Redshifted 21-cm Maps
• ALMA Observations of Quasar Host Galaxies at $z\simeq 4.8$
• Close companions to two high-redshift quasars
• X-ray properties of z>6.5 quasars
• The Canada-France High-z Quasar Survey: 1.2mm Observations
• SDSS J013127.34$-$032100.1: A newly discovered radio-loud quasar at $z=5.18$ with extremely high luminosity
• 21-cm signature of the first sources in the Universe: Prospects of detection with SKA
• SuperBoRG: Exploration of point sources at $z\sim 8$ in HST parallel fields
• NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
• SMBH Seeds from Dissipative Dark Matter
• The High-z Quasar Hubble Diagram
• A Constraint on Quasar Clustering at z=5 from a Binary Quasar
• No Ly$\alpha$ emitters detected around a QSO at z=6.4: Suppressed by the QSO?
• Early Black Holes in Cosmological Simulations: Luminosity Functions and Clustering Behaviour
• Heavy primordial black holes from strongly clustered light black holes
• New Method for Exploring Super-Eddington AGNs by Near-infrared Observations
• The host galaxies of z=7 quasars: predictions from the BlueTides simulation
• X-ray observation of ULAS J1120+0641, the most distant quasar at z=7.08
• Super-Eddington mass growth of intermediate-mass black holes embedded in dusty circumnuclear disks
• A new method to measure the virial factors in the reverberation mapping of AGNs
• Infrared-Faint Radio Sources: A Cosmological View - AGN Number Counts, the Cosmic X-Ray Background and SMBH Formation
• Demographics of z ~ 6 Quasars in the Black Hole Mass-Luminosity Plane
• Supermassive Black Holes in the Early Universe
• A Lyman alpha halo around a quasar at redshift z=6.4
• SILVERRUSH X: Machine Learning-Aided Selection of $9318$ LAEs at $z=2.2$, $3.3$, $4.9$, $5.7$, $6.6$, and $7.0$ from the HSC SSP and CHORUS Survey Data
• An FMOS Survey of moderate-luminosity broad-line AGN in COSMOS, SXDS and E-CDF-S
• Driving the Growth of the Earliest Supermassive Black Holes with Major Mergers of Host Galaxies
• Imprints of quasar duty cycle on the 21cm signal from the Epoch of Reionization
• Studying Cosmic Dawn using redshifted HI 21-cm signal: A brief review
• A hidden population of massive black holes in simulated dwarf galaxies
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z~6
• Quasars as probes of cosmological reionization
• Can the 21 cm signal probe Population III and II star formation?
• Structure Formation after Reheating: Supermassive Primordial Black Holes and Fermi Ball Dark Matter
• Fast jet proper motion discovered in a blazar at z = 4.72
• The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys
• The Assembly of Black Hole Mass and Luminosity Functions of High-redshift Quasars via Multiple Accretion Episodes
• AGN X-ray luminosity function and absorption function in the Early Universe ($3\le z\le 6$)
• New quasar proximity zone size measurements at $z\sim 6$ using the enlarged XQR-30 sample
• Growth of Early Supermassive Black Holes and the High-Redshift Eddington Ratio Distribution
• GA-NIFS and EIGER: A merging quasar host at z=7 with an overmassive black hole
• The rapid transition from star-formation to AGN dominated rest-frame UV light at z ~ 4
• Faint COSMOS AGN at z~3.3 - I. Black Hole Properties and Constraints on Early Black Hole Growth
• Resolving the interstellar medium in the nuclear region of two z=5.78 quasar host galaxies with ALMA
• On the Prevalence of Super-Massive Black Holes over Cosmic Time
• Black Hole Mass Estimation: How good is the virial estimate?
• 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
• Theoretical reevaluations of the black hole mass - bulge mass relation - I. Effect of the seed black hole mass
• Distinctive 21 cm structures of the first stars, galaxies, and quasars
• Spectroscopy of the spatially-extended Lya emission around a QSO at z=6.4
• Tully-Fisher Distances and Dynamical Mass Constraints for 24 Host Galaxies of Reverberation-Mapped AGN
• Constraining the epoch of reionization from the observed properties of the high-z Universe
• Deep Learning in Searching the Spectroscopic Redshift of Quasars
• X-ray emission from a rapidly accreting narrow-line Seyfert 1 galaxy at z=6.56
• Formation of the Little Red Dots from the Core-collapse of Self-interacting Dark Matter Halos
• The central engine of the highest redshift blazar
• The Age-Redshift Relationship of Old Passive Galaxies
• Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to black holes being seeds of high-redshifted supermassive black holes
• Cosmological Tests with the FSRQ Gamma-ray Luminosity Function
• A 1-dimensional hydrodynamic model for accretion, cooling and heating of gas in dark matter halos from $z=6$ to $z=0$
• Physical properties of AGN host galaxies as a probe of SMBH feeding mechanisms
• Revisiting the Affleck-Dine mechanism for primordial black hole formation
• The black hole - host galaxy relation for very low-mass quasars
• The ALHAMBRA survey: Discovery of a faint QSO at z = 5.41
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• AGNs at the cosmic dawn: predictions for future surveys from a $\Lambda$CDM cosmological model
• XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326
• Light or heavy supermassive black hole seeds: the role of internal rotation in the fate of supermassive stars
• Splitting the lentils: Clues to galaxy/black hole coevolution from the discovery of offset relations for non-dusty versus dusty (wet-merger-built) lenticular galaxies in the $M_{\mathrm{bh}}$-$M_{\ast ,\mathrm{spheroid}}$ diagram
• SHELLQs. Bridging the Gap: JWST Unveils Obscured Quasars in the Most Luminous Galaxies at z > 6
• Detecting the Highest Redshift (z > 8) QSOs in a Wide, Near Infrared Slitless Spectroscopic Survey
• What do observations tell us about the highest-redshift supermassive black holes?
• Quasistationary solutions of scalar fields around accreting black holes
• The role of AGN jets in the reionization epoch
• Chandra Detection of Three X-ray Bright Quasars at z>5
• Black hole mass and spin estimates of the most distant quasars
• Enhanced Detectability of Pre-reionization 21-cm Structure
• Radio-loud fraction of z>6 quasars
• Jets, black holes and disks in blazars
• Accretion of Dissipative Dark Matter onto Active Galactic Nuclei
• On the Evolution of High-Redshift Active Galactic Nuclei
• The impact of faint AGN discovered by JWST on reionization
• Probing quasar lifetimes with proximate $21$-centimetre absorption in the diffuse intergalactic medium at redshifts $z\ge 6$
• AGN jets versus accretion as reionization sources
• An X-ray fading, UV brightening QSO at $z\approx 6$
• Evolution of the mass relation between supermassive black holes and dark matter halos across the cosmic time
• The evolution of high-redshift massive black holes
• Exponentially growing bubbles around early super massive black holes
• SMBH growth parameters in the early Universe of Millennium and Millennium-II simulations
• Numerical simulations of AGN wind feedback on black hole accretion: probing down to scales within the sphere of influence
• High Star Formation Rates of Low Eddington Ratio Quasars at $z\gtrsim 6$
• The low-mass end of the Mbh/Mhost relation in quasars
• Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly$\alpha$ halos
• Limits on the growth rate of supermassive black holes at early cosmic epochs
• The AGN Hubble Diagram and Its Implications for Cosmology
• J1342+0928 Supports the Timeline in the R_h=ct Cosmology
• Unseen Progenitors of Luminous High-z Quasars in the R_h=ct Universe
• Effects of the Hubble Parameter on the Cosmic Growth of the First Quasars
• Unresolved z~8 point sources and their impact on the bright end of the galaxy luminosity function
• Measuring the Virial Factor in SDSS DR5 Quasars with Redshifted H$\beta$ and Fe ii Broad Emission Lines
• Fast-growing SMBHs in Fast-growing Galaxies, at High Redshifts: the Role of Major Mergers as Revealed by ALMA
• Revealing new high redshift quasar populations through Gaussian mixture model selection
• Radio recombination lines from obscured quasars with the SKA
• High-redshift quasar selection from the CFHQSIR survey
• The physical constraints on a new LoBAL QSO at z=4.82
• Evidence that Eddington ratio depends upon a supermassive black hole's mass and redshift: Implications for radiative efficiency
• An Optically Faint Quasar Survey at z~5 in the CFHTLS Wide Field: Estimates of the Black Hole Masses and Eddington Ratios
• FNet II: Spectral Classification of Quasars, Galaxies, Stars, and broad absorption line (BAL) Quasars
• Prospects of a statistical detection of the 21-cm forest and its potential to constrain the thermal state of the neutral IGM during reionization
• Measuring the Virial Factor in SDSS DR7 AGNs with Redshifted H$\beta$ and H$\alpha$ Broad Emission Lines
• Constraining Dynamical Dark Energy Models through the Abundance of High-Redshift Supermassive Black Holes
• Effects of spin on constraining the seeds and growth of $\gtrsim 10^9{M}_{\odot }$ supermassive black holes in $z>6.5$ Quasars
• The Dawn of Black Holes
• Rapidly accreting black hole of the Lyα-luminous quasar PSO J006.1240+39.2219
• Searching for Low-Redshift Hot Dust-Obscured Galaxies
• JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
• Magnetic Reconnection as a Potential Driver of X-ray Variability in Active Galactic Nuclei
• Cosmic quenching and scaling laws for the evolution of supermassive black holes and host galaxies
• Intervening nuclear obscuration changing the X-ray look of the $z\approx 6$ QSO CFHQS J164121+375520
• Cosmological test using the high-redshift detection rate of FSRQs with the Square Kilometer Array
• A Comprehensive JWST/NIRSpec Census of Broad-line Active Galactic Nuclei: Faint, Low-mass Accretors and a Population of Little Red Dots
• Quasar clustering at redshift 6
• The impact of black hole feedback on the UV luminosity and stellar mass assembly of high-redshift galaxies
• BASS XXX: Distribution Functions of DR2 Eddington-ratios, Black Hole Masses, and X-ray Luminosities
• A Simple Condition for Sustained Super-Eddington Black Hole Growth
• The Contribution of AGN Accretion Disks to Hydrogen Reionization
• Identification of high-redshift X-ray active galactic nuclei in the 4XMM-DR11 serendipitous catalogue using DES data: Comparative analysis with optically-selected QSOs
• Black Hole merger rates in the first billion years in light of JWST data