A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6

Abstract

We present the discovery of three new quasars at z>6 in 1300 deg^2 of SDSS imaging data, J114816.64+525150.3 (z=6.43), J104845.05+463718.3 (z=6.23) and J163033.90+401209.6 (z=6.05). The first two objects have weak Ly alpha emission lines; their redshifts are determined from the positions of the Lyman break. They are only accurate to 0.05 and could be affected by the presence of broad absorption line systems. The last object has a Ly alpha strength more typical of lower redshift quasars. Based on a sample of six quasars at z>5.7 that cover 2870 deg^2 presented in this paper and in Paper I, we estimate the comoving density of luminous quasars at z 6 and M_{1450} < -26.8 to be (8 +/- 3)x10^{-10} Mpc^{-3} (for H_0 = 50 km/s/Mpc, Omega = 1). HST imaging of two z>5.7 quasars and high-resolution ground-based images (seeing 0.4'') of three additional z>5.7 quasars show that none of them is gravitationally lensed. The luminosity distribution of the high-redshfit quasar sample suggests the bright end slope of the quasar luminosity function at z 6 is shallower than Psi L^{-3.5} (2-sigma), consistent with the absence of strongly lensed objects.

AJ in press (Apr 2003), 26 pages, 9 figures

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• Genesis and evolution of dust in galaxies in the early Universe II. Rapid dust evolution in quasars at z > 6
• The prompt optical/near-infrared flare of GRB 050904: the most luminous transient ever detected
• Stellar populations and Lya emission in two lensed z>~6 galaxies
• Realistic Event Rates for Detection of Supermassive Black Hole Coalescence by LISA
• The origin of the Far-infrared continuum of z ~ 6 quasars: a radiative transfer model for SDSS J1148+5251
• The Biggest Explosions in the Universe
• Cosmological test using the Hubble diagram of high-z quasars
• The journey of QSO haloes from z=6 to the present
• The Nature of CO Emission From z~6 Quasars
• Radial and 2D Colour Properties of E+A Galaxies
• Jet enhanced accretion growth of supermassive black holes
• Environments of z>5 quasars: searching for protoclusters at submillimetre wavelengths
• The combined effect of AGN and supernovae feedback in launching massive molecular outflows in high-redshift galaxies
• Cosmic String Loops as the Seeds of Super-Massive Black Holes
• The effect of peculiar velocities on the epoch of reionization (EoR) 21-cm signal
• SHARC-II 350 micron Observations of Thermal Emission from Warm Dust in z>=5 Quasars
• Statistics of the epoch of reionization 21-cm signal - I. Power spectrum error-covariance
• The low or retrograde spin of the first extragalactic microquasar: implications for Blandford-Znajek powering of jets
• A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
• Early growth of typical high redshift black holes seeded by direct collapse
• Combining WMAP and SDSS Quasar Data on Reionization Constrains Cosmological Parameters and the Star Formation Efficiency
• Impact of baryonic streaming velocities on the formation of supermassive black holes via direct collapse
• The Search for the Farthest Quasar: Consequences for Black Hole Growth and Seed Models
• The iron K feature in Narrow Line Seyfert 1's: evidence for a P Cygni profile?
• Cosmological perturbations and the reionization epoch
• Core-Halo Mass Relation in Scalar Field Dark Matter Models and its Consequences for the Formation of Supermassive Black Holes
• Observational Properties of Simulated Galaxies in Overdense and Average Regions at High Redshifts z= 6-12
• Faint progenitors of luminous $z\sim 6$ quasars: why don't we see them?
• The Impact of Energy Feedback on Quasar Evolution and Black Hole Demographics
• Faint-end Quasar Luminosity Functions from Cosmological Hydrodynamic Simulations
• Observing the first galaxies
• Direct Collapse to Supermassive Black Hole Seeds with Radiative Transfer: Isolated Halos
• Thermal stability of winds driven by radiation pressure in super-Eddington accretion disks
• Compact radio cores: from the first black holes to the last
• Redshifted 21-cm Bispectrum I: Impact of the Redshift Space Distortions on the Signal from the Epoch of Reionization
• The galaxies that reionized the Universe
• Supermassive Black Hole Seed Formation at High Redshifts: Long-Term Evolution of the Direct Collapse
• The Biggest Explosions in the Universe. II
• The Pan-STARRS1 $\mathbf{z}>5.6$ Quasar Survey: III. The $\mathbf{z}\approx 6$ Quasar Luminosity Function
• The space density of z>4 blazars
• Supermassive Black Holes and Their Environments
• Discovery of a new high redshift QSO at z=5.96 with the Subaru telescope
• Songlines from Direct Collapse Seed Black Holes: Effects of X-rays on Black Hole Growth and Stellar Populations
• A new bright z=6.82 quasar discovered with VISTA: VHS J0411-0907
• Detections of [OIII] 88 $\mu$m in Two Quasars in the Reionization Epoch
• Discovery of an Optically-Faint Quasar at z=5.70 and Implications for the Faint End of the Quasar Luminosity Function
• Two channels of supermassive black hole growth as seen on the galaxies mass-size plane
• Modeling Supermassive Primordial Stars with MESA
• High-resolution radio imaging of the most distant radio quasar SDSS J0836+0054
• A Statistical Analysis of Intergalactic Medium Transmission Approaching Reionization
• Limits on the evolution of galaxies from the statistics of gravitational lenses
• Constraints on high-J CO emission lines in $z\sim 6$ quasars
• Direct collapse to supermassive black hole seeds: the critical conditions for suppression of ${\mathrm{H}}_2$ cooling
• Hubble Advanced Camera for Surveys Observations of the z=6.42 Quasar SDSS 1148+5251: A Leak in the Gunn-Peterson Trough
• Assembly of supermassive black hole seeds
• The reanalysis of spectra of GRB 080913 to estimate the neutral fraction of the IGM at a redshift of 6.7
• Rapid Merger of Binary Primordial Black Holes: an Implication for GW150914
• Radio structure of the most distant radio-detected quasar at the ten milli- arcsecond scale
• HST narrow-band search for extended Ly-alpha emission around two z>6 quasars
• VLT adaptive optics imaging of QSO host galaxies and close environment at z ~2.5: results from a pilot program
• Limits to Rest-Frame Ultraviolet Emission From Far-Infrared-Luminous z~6 Quasar Hosts
• Wide-field LOFAR-LBA power-spectra analyses: Impact of calibration, polarization leakage and ionosphere
• The Shape and Size distribution of HII Regions near the percolation transition
• Direct Collapse to Supermassive Black Hole Seeds with Radiation Transfer: Cosmological Halos
• Starburst activity in the host galaxy of the z=2.58 quasar J1409+5628
• The Near and Mid-infrared photometric properties of known redshift $z\ge 5$ Quasars
• Improving constraints on the reionization parameters using 21-cm bispectrum
• Exploring the AGN Fraction of a Sample of JWST's Little Red Dots at $5<z<8$: Overmassive Black Holes Are Strongly Favored
• Swift observations of GRB050904: the most distant cosmic explosion ever observed
• On spatial distributions of old globular clusters in clusters of galaxies
• Constraining Quasar and IGM Properties Through Bubble Detection in Redshifted 21-cm Maps
• Quasar Photometric Redshifts and Candidate Selection: A New Algorithm Based on Optical and Mid-Infrared Photometric Data
• Spitzer Observations of High Redshift QSOs
• Studying the morphology of HI isodensity surfaces during reionization using Shapefinders and percolation analysis
• No Evidence for Millimeter Continuum Source Overdensities in the Environments of $z\gtrsim 6$ Quasars
• Forming supermassive black holes by accreting dark and baryon matter
• Influence of Population III stars on cosmic chemical evolution
• Effects of the sources of reionization on 21-cm redshift-space distortions
• Bulge-driven Fueling of Seed Black Holes
• Formation of High-redshift (z>6) Quasars Driven by Nuclear Starbursts
• Formation of intracluster globular clusters
• The Damping Wing of the Gunn-Peterson Absorption and Lyman-Alpha Emitters in the Pre-Reionization Era
• Calibrating the Galaxy Halo - Black Hole Relation Based on the Clustering of Quasars
• Constraining the X-ray heating and reionization using 21-cm power spectra with Marginal Neural Ratio Estimation
• The environments of z~1 Active Galactic Nuclei at 3.6um
• Near-infrared adaptive optics imaging of high redshift quasars
• Was the Universe Reionized at Redshift 10?
• Quasar feedback in the early Universe: the case of SDSS J1148+5251
• The Gentle Growth of Galaxies at High Redshifts in Overdense Environments
• RC J0311+0507: A Candidate for Superpowerful Radio Galaxies in the Early Universe at Redshift z=4.514
• The Collapse of Atomically-Cooled Primordial Haloes. I. High Lyman-Werner Backgrounds
• Sowing black hole seeds: Direct collapse black hole formation with realistic Lyman-Werner radiation in cosmological simulations
• Stellar collisions in flattened and rotating Pop. III star clusters
• Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z$\approx 5.5$
• Herschel/PACS far-infrared photometry of two z>4 quasars
• Rayleigh Scattering Cross Section Redward of Ly$\alpha$ by Atomic Hydrogen
• The Birth of Binary Direct-Collapse Black Holes
• Early Black Holes in Cosmological Simulations: Luminosity Functions and Clustering Behaviour
• The Extremely Luminous Quasar Survey in the Pan-STARRS 1 Footprint (PS-ELQS)
• On inferring extinction laws in z~6 quasars as signatures of supernova dust
• The X-ray Spectrum of the z=6.30 QSO SDSS J1030+0524
• The Most Massive Black Holes in the Universe: Effects of Mergers in Massive Galaxy Clusters
• A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: II. Constraints on the 4.0<z<4.5 Quasar Population
• The host galaxies of z=7 quasars: predictions from the BlueTides simulation
• The near-IR properties and continuum shapes of high redshift quasars from the Sloan Digital Sky Survey
• Redshifted 21 cm Emission From the Pre-Reionization Era II. HII Regions Around Individual Quasars
• Global instability by runaway collisions in nuclear stellar clusters: Numerical tests of a route for massive black hole formation
• The hyperluminous Compton-thick $z\sim 2$ quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR
• Cosmological Implications of the Very High Redshift GRB 050904
• The Dark Side of QSO Formation at High Redshifts
• X-ray spectroscopy of the z=6.4 quasar J1148+5251
• Supermassive Black Holes in the Early Universe
• Cosmic Renaissance: The First Sources of Light
• Finding New High-Redshift Quasars by Asking the Neighbours
• Probing the thermal history during reionization using a semi-numerical photon-conserving code SCRIPT
• The properties of quasar hosts at the peak of the quasar activity
• Infrared-Faint Radio Sources: A Cosmological View - AGN Number Counts, the Cosmic X-Ray Background and SMBH Formation
• On dark matter - dark radiation interaction and cosmic reionization
• Radiation from early black holes - I: effects on the neutral inter-galactic medium
• The Accretion and Cooling of Preheated Gas in Dark Matter Halos
• Star cluster disruption by a massive black hole binary
• Gravitational lensing magnification without multiple imaging
• The Galactic globular cluster system as a fossil record of reionization
• Driving the Growth of the Earliest Supermassive Black Holes with Major Mergers of Host Galaxies
• B2 0902+34: A Collapsing Protogiant Elliptical Galaxy at z=3.4
• Gravitational Wave Signals from the First Massive Black Hole Seeds
• High-redshift SMBHs can grow from stellar-mass seeds via chaotic accretion
• HE 0141-3932: a bright QSO with an unusual emission line spectrum and associated absorption
• The 6C** sample of steep-spectrum radio sources: II - Redshift distribution and the space density of high-redshift radio galaxies
• Quasars as probes of cosmological reionization
• Chandra and Magellan/FIRE follow-up observations of PSO167-13: an X-ray weak QSO at $z=6.515$
• Observing the host galaxies of high-redshift quasars with JWST: predictions from the BlueTides simulation
• Observing the First Stars and Black Holes
• Evidence for Merger-Driven Activity in the Clustering of High Redshift Quasars
• Scaling defect decay and the reionization history of the Universe
• The Formation and Evolution of the First Massive Black Holes
• Spatially Resolving the Kinematics of the <100 μas Quasar Broad Line Region using Spectroastrometry
• Athena Wide Field Imager Key Science Drivers
• The rapid transition from star-formation to AGN dominated rest-frame UV light at z ~ 4
• GA-NIFS and EIGER: A merging quasar host at z=7 with an overmassive black hole
• Observational properties of a general relativistic instability supernova from a primordial supermassive star
• Black hole formation in the context of dissipative dark matter
• Ultrafast outflows in ultraluminous X-ray sources
• WISE detections of known QSOs at redshifts greater than six
• Angular correlation as a novel probe of supermassive primordial black holes
• On the Origin of Mass--Metallicity Relations, Blue Tilts, and Scaling Relations for Metal-poor Globular Cluster Systems
• Fossil records of cosmic reionization in galactic stellar halos
• A Thirty-Four Billion Solar Mass Black Hole in SMSS J2157-3602, the Most Luminous Known Quasar
• Late-time vacuum phase transitions: Connecting sub-eV scale physics with cosmological structure formation
• Lyman$\alpha$ Emitters beyond Redshift 5:The Dawn of Galaxy Formation
• VLBI observation of the newly discovered z=5.18 quasar SDSS J0131-0321
• Investigating X-ray sources during the epoch of reionization with the 21 cm signal
• HYPERION. Coevolution of supermassive black holes and galaxies at $z>6$ and the build-up of massive galaxies
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of Two Red Quasars at z > 5.6
• A simple model for the evolution of super-massive black holes and the quasar population
• Inception of a first quasar at cosmic dawn
• Limits on luminosity and mass accretion rate of a radiation pressure dominated accretion disc
• Photometric Properties of the Most Massive High-Redshift Galaxies
• CDIM: Cosmic Dawn Intensity Mapper Final Report
• Early Black Hole Formation by Accretion of Gas and Dark Matter
• Gemini-South + FLAMINGOS Demonstration Science: Near-Infrared Spectroscopy of the z=5.77 Quasar SDSS J083643.85+005453.3
• Have we detected one of the sources responsible for an early reionisation of the Universe?
• The low-metallicity QSO HE 2158-0107: A massive galaxy growing by the accretion of nearly pristine gas from its environment?
• Little Red Dots Are Nurseries of Massive Black Holes
• Black Hole Growth in Disk Galaxies Mediated by the Secular Evolution of Short Bars
• A practical guide to the massive black hole cosmic history
• Quasars as Probes of Late Reionization and Early Structure Formation
• The Response of Metal Rich Gas to X-Ray Irradiation from a Massive Black Hole at High Redshift: Proof of Concept
• Sky-averaged 21-cm signal extraction using multiple antennas with an SVD framework: the REACH case
• The Spitzer Extragalactic Representative Volume Survey (SERVS): The Environments of High-z SDSS Quasi-Stellar-Objects
• Selection constraints on high redshift quasar searches in the VISTA kilo-degree infrared galaxy survey
• The Color Selection of Quasars from Redshifts 5 to 10: Cloning and Discovery
• Properties of High Redshift Quasars-I: Evolution of the super-massive black-hole to halo mass ratio
• Constraints on Dark Energy from the Observed Expansion of our Cosmic Horizon
• High resolution science with high redshift galaxies
• Efficiency of black hole formation via collisions in stellar systems: An analysis of data from simulations and observations
• Star formation and accretion in the circumnuclear disks of active galaxies
• Black hole foraging: feedback drives feeding
• Near-infrared K-band imaging of a sample of Ultra-Steep-Spectrum radio sources selected at 74 MHz
• Radiation-driven turbulent accretion onto massive black holes
• Calibration Requirements for Epoch of Reionization 21-cm signal observations -- I. Effect of time-correlated gains
• Cosmological Tests with the FSRQ Gamma-ray Luminosity Function
• Formation of the seed black holes: a role of quark nuggets?
• Observational estimates of the initial power spectrum at small scale from Lyman-$\alpha$ absorbers
• Intermittent fragmentation and statistical variations during gas collapse in magnetised atomic cooling haloes
• Reanalysis of the spectrum of the z=10 galaxy
• New Supporting Evidence for the Overdensity of Galaxies around the Radio-Loud Quasar SDSS J0836+0054 at z =5.8
• Observations of the High Redshift Universe
• Searching for the most distant blazars with the Fermi Gamma-ray Space Telescope
• Opacity limit for supermassive protostars
• Lens or Binary? Chandra Observations of the Wide Separation Broad Absorption Line Quasar Pair UM425
• The infrared-luminous progenitors of high-z quasars
• AGNs at the cosmic dawn: predictions for future surveys from a $\Lambda$CDM cosmological model
• The Clustering of Undetected High-redshift Black Holes and Their Signatures in Cosmic Backgrounds
• Cosmic Textures and Global Monopoles as Seeds for Super-Massive Black Holes
• What do observations tell us about the highest-redshift supermassive black holes?
• Source Mergers and Bubble Growth During Reionization
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• Role of magnetic fields in the formation of direct collapse black holes
• Detecting the Highest Redshift (z > 8) QSOs in a Wide, Near Infrared Slitless Spectroscopic Survey
• The shallow slope of the z~6 quasar luminosity function: limits from the lack of multiple image gravitational lenses
• Triggering the formation of direct collapse black holes by their congeners
• Formation of the Galactic globular clusters with He-rich stars in low-mass halos virialized at high redshift
• Extreme Galaxies During Reionization: Testing ISM and Disk Models
• Properties of High Redshift Quasars-II: What does the quasar luminosity function tell us about super-massive black-hole evolution?
• Chandra measurement of the X-ray spectrum of a quasar at z=5.99
• Active Galactic Nuclei at the Crossroads of Astrophysics
• Simulation-Based Inference of the sky-averaged 21-cm signal from CD-EoR with REACH
• JADES reveals a large population of low mass black holes at high redshift
• Asymmetric Deviation of the Scattering Cross Section around Ly$\alpha$ by Atomic Hydrogen
• Distinguishing reionization models using the largest cluster statistics of the 21-cm maps
• Reality or Mirage? Observational Test and Implications for the Claimed Extremely Magnified Quasar at $z=6.3$
• XMM-Newton spectroscopy of high redshift quasars
• An Exploratory Search for z~6 Quasars in the UKIDSS Early Data Release
• Early Science with the Large Millimeter Telescope: Dust constraints in a z~9.6 galaxy
• Exponentially growing bubbles around early super massive black holes
• Formation of the First Black Holes: Current observational status
• X-rays from the First Massive Black Holes
• A sample of radio-loud QSOs at redshift ~ 4
• Spatially Resolved Stellar Populations of Eight GOODS-South AGN at z~1
• Statistical characteristics of observed Ly-$\alpha$ forest and the shape of initial power spectrum
• Quark-Novae, cosmic reionization, and early r-process element production
• Statistical characteristics of observed Ly-$\alpha$ forest and the shape of linear power spectrum
• Growth of massive black holes at high-z via accretion predominantly driven by magnetic outflows
• Adaptive Optics: Observations and Prospects for Studies of Active Galactic Nuclei
• J1342+0928 Supports the Timeline in the R_h=ct Cosmology
• Supermassive Black Holes: Connecting the Growth to the Cosmic Star Formation Rate
• Winds in ultraluminous X-ray sources: new challenges
• Structure of the super-Eddington outflow and itsimpact on the cosmological scale
• Line of sight anisotropies in the Cosmic Dawn and EoR 21-cm power spectrum
• Submillimeter signatures from growing supermassive black holes before reionization
• On the Origin of the Kinematical Differences Between the Stellar Halo and the Old Globular Cluster System in the Large Magellanic Cloud
• Evolution of supermassive black holes
• Impact of the Epoch of Reionization sources on the 21-cm bispectrum
• Let there be Light: the Emergence of Structure out of the Dark Ages in the Early Universe
• Radio recombination lines from obscured quasars with the SKA
• Astrophysics with the Laser Interferometer Space Antenna
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
• High-redshift Mini-haloes from Modulated Preheating
• Dynamics around supermassive black holes
• Interpreting the HI 21-cm cosmology maps through Largest Cluster Statistics -- I: Impact of the synthetic SKA1-Low observations
• Are Two z~6 Quasars Gravitationally Lensed ?
• From gas to galaxies
• Small glitches: the role of strange nuggets?
• Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies
• The Faintness of the 158 um [CII] Transition in the z=6.42 Quasar SDSS J1148+5251
• Constraining Dynamical Dark Energy Models through the Abundance of High-Redshift Supermassive Black Holes
• Modeling the accretion history of supermassive black holes
• Cosmic reionization constraints on the nature of cosmological perturbations
• Detecting quasars at very high redshift with next generation X-ray telescopes
• A survey for low luminosity quasars at redshift z~5
• JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
• Ionospheric effect on the synthetic Epoch of Reionization observations with the SKA1-Low
• An X-ray Selected AGN at z=4.6 Discovered by the CYDER Survey
• CMB Signatures of Extended Reionization
• Sky surveys and deep fields of ground-based and space telescopes
• Growth and Feedback from the First Black Holes
• Probing the rapid formation of black holes and their galaxy hosts in QSOs
• Microglitches in radio pulsars: the role of strange nuggets
• Black Hole Formation and Growth: Simulations in General Relativity
• Hot Diggity Dog: Simultaneous CO and Dust Modeling of the Most Luminous WISE Hot Dust-Obscured Galaxy Unveils Extreme Molecular Gas Excitation
• The Effect of Primordial Non-Gaussianities on the Seeds of Super-Massive Black Holes
• Intensity correlation speckles as a technique for removing Doppler broadening
• Joint Lyα emitters - quasars reionization constraints
• Too small to succeed: the difficulty of sustaining star formation in low-mass haloes
• Accretion disk dynamics: α-viscosity in self-similar self-gravitating models
• From ANN to BNN: Inferring Reionization Parameters using Uncertainty-aware Emulators of 21-cm Summaries
• Direct Collapse to Precursors of Supermassive Black Hole Seeds:Radiation-feedback-generated Outflows
• A study of 1000 galaxies with unusually young and massive stars in the SDSS: a search for hidden black holes
• Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at $z\gtrsim 6$ Shows No Evidence of Lensing
• The haloes that reionized the Universe
• The evolution of Radio Loud Quasar host galaxies: AO observations at z = 3
• High redshift galaxy surveys
• Ice emission and the redshifts of submillimeter sources
• Molecular lines studies at redshift greater than 1
• Mass transport in galaxy discs limits black hole growth to sub-Eddington rates
• Direct Collapse Pre-supermassive Black Hole Objects as Ly$\alpha$ Emitters
• The Contribution of AGN Accretion Disks to Hydrogen Reionization
• Molecular gas in galaxies at all redshifts
• Polarization of AGN in UV Spectral Range
• Probing extreme black-hole outflows on short timescales via high spectral-resolution X-ray imagers
• Submillimetre Cosmology at High Angular Resolution
• Growth of black holes at the centre of early-type galaxies in MOND