The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe

Abstract

Luminous quasars at z>5.6 can be studied in detail with the current generation of telescopes and provide us with unique information on the first gigayear of the universe. Thus far these studies have been statistically limited by the number of quasars known at these redshifts. Such quasars are rare and therefore wide-field surveys are required to identify them and multiwavelength data are needed to separate them efficiently from their main contaminants, the far more numerous cool dwarfs. In this paper, we update and extend the selection for z~6 quasars presented in Banados et al. (2014) using the Pan-STARRS1 (PS1) survey. We present the PS1 distant quasar sample, which currently consists of 124 quasars in the redshift range 5.6<z<6.7 that satisfy our selection criteria. Seventy-seven of these quasars have been discovered with PS1, and 63 of them are newly identified in this paper. We present composite spectra of the PS1 distant quasar sample. This sample spans a factor of ~20 in luminosity and shows a variety of emission line properties. The number of quasars at z>5.6 presented in this work almost double the quasars previously known at these redshifts, marking a transition phase from studies of individual sources to statistical studies of the high-redshift quasar population, which was impossible with earlier, smaller samples.

arXiv commentAccepted by ApJS. Machine readable tables and an up-to-date census of z>5.6 quasars are available at https://users.obs.carnegiescience.edu/~ebanados/high-z-qsos.html

References in corpus (89)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Astropy: A Community Python Package for Astronomy
• Planck 2015 results. XIII. Cosmological parameters
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• A luminous quasar at a redshift of z = 7.085
• The Pan-STARRS1 Photometric System
• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• The UKIRT Infrared Deep Sky Survey ZYJHK Photometric System: Passbands and Synthetic Colours
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6
• Initial Performance of the NEOWISE Reactivation Mission
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• The Canada-France High-z Quasar Survey: nine new quasars and the luminosity function at redshift 6
• The WFCAM Science Archive
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• GROND - a 7-channel imager
• Star Formation and Gas Kinematics of Quasar Host Galaxies at z~6: New insights from ALMA
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey III: Discovery of Five Additional Quasars
• Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
• Eddington-limited accretion and the black hole mass function at redshift 6
• The Formation and Evolution of Massive Black Holes
• The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data
• Discovery of three z>6.5 quasars in the VISTA Kilo-degree Infrared Galaxy (VIKING) survey
• The Carnegie Supernova Project: The Low-Redshift Survey
• The Discovery of a Luminous z=5.80 Quasar from the Sloan Digital Sky Survey
• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
• Molecular Gas in Redshift 6 Quasar Host Galaxies
• The Sloan Digital Sky Survey quasar catalog: tenth data release
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• The z=5 Quasar Luminosity Function from SDSS Stripe 82
• Evidence for non-evolving FeII/MgII ratios in rapidly accreting z~6 QSOs
• Black hole mass estimates and emission-line properties of a sample of redshift z>6.5 quasars
• Subaru high-z exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9
• Bright [CII] and dust emission in three z>6.6 quasar host galaxies observed by ALMA
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• A Survey of z~6 Quasars in the SDSS Deep Stripe. II. Discovery of Six Quasars at z_{AB}>21
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• Detection of atomic carbon [CII] 158 micron and dust emission from a z=7.1 quasar host galaxy
• High-Redshift SDSS Quasars with Weak Emission Lines
• Thermal Emission from Warm Dust in the Most Distant Quasars
• Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• An X-shooter composite of bright 1 < z < 2 quasars from UV to infrared
• Reionization and high-redshift galaxies: the view from quasar absorption lines
• Spectral Energy Distributions of QSOs at z>5: common AGN-heated dust and occasionally strong star-formation
• Discovery of eight z ~ 6 quasars from Pan-STARRS1
• Redshift 6.4 host galaxies of 10^8 solar mass black holes: low star formation rate and dynamical mass
• Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey
• Constraining the radio-loud fraction of quasars at z>5.5
• Ionization near-zones associated with quasars at z ~ 6
• Self-shadowing Effects of Slim Accretion Disks in Active Galactic Nuclei: Diverse Appearance of the Broad-line Region
• The Subaru high-z quasar survey: discovery of faint z~6 quasars
• A survey of luminous high-redshift quasars with SDSS and WISE. I. target selection and optical spectroscopy
• Probing the interstellar medium and star formation of the Most Luminous Quasar at z=6.3
• First discoveries of z~6 quasars with the Kilo Degree Survey and VISTA Kilo-Degree Infrared Galaxy survey
• Cold Accretion Disks and Lineless Quasars
• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. II. L/T Transition Atmospheres and Young Discoveries
• A large spectroscopic sample of L and T dwarfs from UKIDSS LAS: peculiar objects, binaries, and space density
• Discovery of a z=6.1 Radio-Loud Quasar in the NDWFS
• Two bright z > 6 quasars from VST ATLAS and a new method of optical plus mid-infra-red colour selection
• X-ray and Multiwavelength Insights into the Nature of Weak Emission-Line Quasars at Low Redshift
• The discovery of the first luminous z~6 quasar in the UKIDSS Large Area Survey
• DES J0454-4448: Discovery of the First Luminous z > 6 Quasar from the Dark Energy Survey
• Discovery of a redshift 6.13 quasar in the UKIRT Infrared Deep Sky Survey
• CO (2-1) Line Emission in Redshift 6 Quasar Host Galaxies
• Detection of Rest-frame Optical Lines from X-shooter Spectroscopy of Weak Emission Line Quasars
• Bright [CII] 158$\mu$m emission in a quasar host galaxy at $z=6.54$
• Weak Emission Line Quasars in the Context of a Modified Baldwin Effect
• The Discovery of Three New z>5 Quasars in the AGN and Galaxy Evolution Survey
• The dust content of QSO hosts at high redshift
• Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
• The First High Redshift Quasar from Pan-STARRS
• Mid-Infrared Selection of Brown Dwarfs and High-Redshift Quasars
• Detection of $1.6\times 10^{10}$ M${}_{\odot }$ of molecular gas in the host galaxy of the $z=5.77$ SDSS quasar J0927+2001
• No excess of bright galaxies around the redshift 7.1 quasar ULAS J1120+0641
• Dusty torus formation by anisotropic radiative pressure feedback of active galactic nuclei
• Discovery of a Radio-Selected z ~ 6 Quasar
• Discovery of A Faint Quasar at z~6 and Implications for Cosmic Reionization
• NIR spectroscopy of SDSS J0303-0019: a low luminosity, high Eddington ratio quasar at z~6
• Discovery of a new high redshift QSO at z=5.96 with the Subaru telescope
• Discovery of an Optically-Faint Quasar at z=5.70 and Implications for the Faint End of the Quasar Luminosity Function
• Spectroscopy of Hyades L dwarf candidates
• The spectral energy distribution of the redshift 7.1 quasar ULAS J1120+0641
• Achieving a wide field near infrared camera for the Calar Alto 3.5m telescope
• WISE detections of known QSOs at redshifts greater than six

Cited by in corpus (276)

• An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
• The Assembly of the First Massive Black Holes
• Active Galactic Nuclei: what's in a name?
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7
• An ALMA [CII] survey of 27 quasars at z>5.94
• Hydrogen reionisation ends by $z=5.3$: Lyman-$\alpha$ optical depth measured by the XQR-30 sample
• GA-NIFS: A massive black hole in a low-metallicity AGN at $z\sim 5.55$ revealed by JWST/NIRSpec IFS
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6
• Rapidly star-forming galaxies adjacent to quasars at redshifts exceeding 6
• 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
• Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes
• Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
• A Significantly Neutral Intergalactic Medium Around the Luminous z=7 Quasar J0252-0503
• Exploring Reionization-Era Quasars III: Discovery of 16 Quasars at $6.4\lesssim z\lesssim 6.9$ with DESI Legacy Imaging Surveys and UKIRT Hemisphere Survey and Quasar Luminosity Function at $z\sim 6.7$
• High-redshift AGN in the Chandra Deep Fields: the obscured fraction and space density of the sub-$L_{\ast }$ population
• The mean free path of ionizing photons at 5 < z < 6: evidence for rapid evolution near reionization
• EIGER I. a large sample of [OIII]-emitting galaxies at $5.3<z<6.9$ and direct evidence for local reionization by galaxies
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 Quasars and Luminous Galaxies at 5.7 < z < 6.8
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 < z < 6.9
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 $\le$ z $\le$ 7.0
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). VI. Black Hole Mass Measurements of Six Quasars at 6.1<z<6.7
• Eight new luminous z > 6 quasars selected via SED model fitting of VISTA, WISE and Dark Energy Survey Year 1 Observations
• Measurements of the z ~ 6 Intergalactic Medium Optical Depth and Transmission Spikes Using a New z > 6.3 Quasar Sample
• Probing the thermal state of the intergalactic medium at $z>5$ with the transmission spikes in high-resolution Ly$\alpha$ forest spectra
• Exploring Reionization-Era Quasars IV: Discovery of Six New $z\gtrsim 6.5$ Quasars with DES, VHS and unWISE Photometry
• Copious Amounts of Dust and Gas in a z=7.5 Quasar Host Galaxy
• The Kinematics of z ~ 6 Quasar Host Galaxies
• JWST UNCOVER: Extremely red and compact object at$z_{\mathrm{phot}}\simeq 7.6$ triply imaged by Abell 2744
• The compact, ~1 kpc host galaxy of a quasar at z=7.1
• 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
• The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars
• The X-SHOOTER/ALMA sample of Quasars in the Epoch of Reionization. I. NIR spectral modeling, iron enrichment and broad emission line properties
• Three new VHS-DES Quasars at 6.7 < z < 6.9 and Emission Line Properties at z > 6.5
• EIGER V. Characterizing the Host Galaxies of Luminous Quasars at $z\gtrsim 6$
• Dust emission in an accretion-rate-limited sample of z>6 quasars
• 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 X-ray properties of $z>6$ quasars: no evident evolution of accretion physics in the first Gyr of the Universe
• The Faint End of the z=5 Quasar Luminosity Function from the CFHTLS
• The low-end of the black hole mass function at cosmic dawn
• Detecting and Characterizing Young Quasars I: Systemic Redshifts and Proximity Zones Measurements
• The X-ray properties of z$\sim$6 luminous quasars
• Molecular gas in three z~7 quasar host galaxies
• Black-Hole Growth is Mainly Linked to Host-Galaxy Stellar Mass rather than Star Formation Rate
• First Discoveries of z>6 Quasars with the DECam Legacy Survey and UKIRT Hemisphere Survey
• JADES: A large population of obscured, narrow line AGN at high redshift
• An ALMA multi-line survey of the interstellar medium of the redshift 7.5 quasar host galaxy J1342+0928
• The discovery of a highly accreting, radio-loud quasar at z=6.82
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XIII. Large-scale Feedback and Star Formation in a Low-Luminosity Quasar at z = 7.07 on the Local Black Hole to Host Mass Relation
• On the formation of the first quasars
• Euclid preparation: V. Predicted yield of redshift 7<z<9 quasars from the wide survey
• XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) III. Star formation properties of the host galaxies at $z\gtrsim 6$ studied with ALMA
• No evidence for [CII] halos or high-velocity outflows in z>6 quasar host galaxies
• Widespread, strong outflows in XQR-30 quasars at the Reionisation epoch
• Spatially Resolved Interstellar Medium and Highly-Excited Dense Molecular Gas in the Most Luminous Quasar at z=6.327
• Looking at cosmic near-infrared background radiation anisotropies
• New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5$
• Co-evolution of massive black holes and their host galaxies at high redshift: discrepancies from six cosmological simulations and the key role of JWST
• Revealing the Accretion Physics of Supermassive Black Holes at Redshift z~7 with Chandra and Infrared Observations
• Light, medium-weight or heavy? The nature of the first supermassive black hole seeds
• Minor Contribution of Quasars to Ionizing Photon Budget at z~6: Update on Quasar Luminosity Function at the Faint-end with Subaru/Suprime-Cam
• The accuracy of semi-numerical reionization models in comparison with radiative transfer simulations
• A powerful radio-loud quasar at the end of cosmic reionization
• GA-NIFS: Black hole and host galaxy properties of two z$\simeq$6.8 quasars from the NIRSpec IFU
• Gas dynamics of a luminous $z$ = 6.13 quasar ULAS J1319$+$0950 revealed by ALMA high resolution observations
• First Spectroscopic Study of a Young Quasar
• Three Lyman-alpha emitting galaxies within a quasar proximity zone at z=5.8
• Heavy Element Absorption Systems at $5.0<z<6.8$: Metal-Poor Neutral Gas and a Diminishing Signature of Highly Ionized Circumgalactic Matter
• No evidence for enhanced [OIII] 88um emission in a z~6 quasar compared to its companion starbursting galaxy
• Mapping the Lyman-Alpha Emission Around a z~6.6 QSO with MUSE: Extended Emission and a Companion at Close Separation
• Mg II Absorption at 2<z<7 with Magellan/FIRE, III. Full Statistics of Absorption Towards 100 High-Redshift QSOs
• Connecting the X-ray properties of weak-line and typical quasars: testing for a geometrically thick accretion disk
• An ALMA multi-line survey of the ISM in two quasar host-companion galaxy pairs at $z>6$
• Large Scale Environment of a $z=6.61$ Luminous Quasar Probed by Ly$\alpha$ Emitters and Lyman Break Galaxies
• High-redshift galaxies and black holes in the eyes of JWST: a population synthesis model from infrared to X-rays
• A New Method to Measure the Post-Reionization Ionizing Background from the Joint Distribution of Lyman-$\alpha$ and Lyman-$\beta$ Forest Transmission
• SRG/eROSITA uncovers the most X-ray luminous quasar at z>6
• Chronicling the reionization history at $6\lesssim z\lesssim 7$ with emergent quasar damping wings
• ALMA and HST kiloparsec-scale imaging of a quasar-galaxy merger at $z\approx 6.2$
• Mock catalogs for the extragalactic X-ray sky: simulating AGN surveys with Athena and with the AXIS probe
• No Redshift Evolution in the Broad Line Region Metallicity up to z=7.54: Deep NIR Spectroscopy of ULAS J1342+0928
• XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars
• High metal content of highly accreting quasars
• The Pan-STARRS1 z>5.6 quasar survey II: Discovery of 55 Quasars at 5.6<z<6.5
• A comparison of quasar emission reconstruction techniques for $z\ge 5.0$ Lyman-$\alpha$ and Lyman-$\beta$ transmission
• A metal-poor damped Ly-alpha system at redshift 6.4
• Evolving parsec-scale radio structure in the most distant blazar known
• EIGER III. JWST/NIRCam observations of the ultra-luminous high-redshift quasar J0100+2802
• The molecular gas content in obscured AGN at z > 1
• Definitive upper bound on the negligible contribution of quasars to cosmic reionization
• The dense molecular gas in the $\mathrm{z}\sim 6$ QSO SDSS J231038.88+185519.7 resolved by ALMA
• Constraining the quasar radio-loud fraction at $z\sim 6$ with deep radio observations
• The role of galaxies and AGN in reionising the IGM -- III : IGM-galaxy cross-correlations at z~6 from 8 quasar fields with DEIMOS and MUSE
• The web of the Giant: spectroscopic confirmation of a Large Scale Structure around the z=6.31 quasar SDSS J1030+0524
• Chasing the observational signatures of seed black holes at z > 7: candidate observability
• Constraining Reionization with the $z\sim 5-6$ Lyman-$\alpha$ Forest Power Spectrum: the Outlook after Planck
• Chasing the observational signatures of seed black holes at z > 7: candidate statistics
• Discovery of 16 New z ~ 5.5 Quasars : Filling in the Redshift Gap of Quasar Color Selection
• Physical properties of the first quasars
• The role of galaxies and AGN in reionizing the IGM - II: metal-tracing the faint sources of reionization at $5\lesssim z\lesssim 6$
• 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
• Probing the Nature of High Redshift Weak Emission Line Quasars: A Young Quasar with a Starburst Host Galaxy
• X-ray spectroscopic survey of highly-accreting AGN
• Unveiling early black hole growth with multi-frequency gravitational wave observations
• Strong Clustering of Lyman Break Galaxies around Luminous Quasars at z~4
• Discovery of 24 radio-bright quasars at $4.9\le z\le 6.6$ using low-frequency radio observations
• First constraints on the AGN X-ray luminosity function at $z\sim 6$ from an eROSITA-detected quasar
• Chandra X-rays from the redshift 7.54 quasar ULAS J1342+0928
• The XQR-30 Metal Absorber Catalog: 778 Absorption Systems Spanning 2 < z < 6.5
• The Pan-STARRS1 $\mathbf{z}>5.6$ Quasar Survey: III. The $\mathbf{z}\approx 6$ Quasar Luminosity Function
• DESI z >~ 5 Quasar Survey. I. A First Sample of 400 New Quasars at z ~ 4.7-6.6
• Metallicity in Quasar Broad Line Regions at Redshift $\sim$ 6
• A new bright z=6.82 quasar discovered with VISTA: VHS J0411-0907
• The 500 ks Chandra observation of the z = 6.31 QSO SDSS J1030+0524
• The Impact of Dust on the Sizes of Galaxies in the Epoch of Reionization
• Ly$\alpha$ Halos Around $z\sim 6$ Quasars
• Discovery of the first heavily obscured QSO candidate at $z>6$ in a close galaxy pair
• Rapid Black Hole Growth at the Dawn of the Universe: A Super-Eddington Quasar at z=6.6
• X-ray Observations of a $z\sim 6.2$ Quasar/Galaxy Merger
• Constraints on high-J CO emission lines in $z\sim 6$ quasars
• Constraining galaxy overdensities around three z~6.5 quasars with ALMA and MUSE
• 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
• Enhanced X-ray Emission from the Most Radio-Powerful Quasar in the Universe's First Billion Years
• A spectral stacking analysis to search for faint outflow signatures in z~6 quasars
• The Near and Mid-infrared photometric properties of known redshift $z\ge 5$ Quasars
• No Evidence for Millimeter Continuum Source Overdensities in the Environments of $z\gtrsim 6$ Quasars
• Quasar Photometric Redshifts and Candidate Selection: A New Algorithm Based on Optical and Mid-Infrared Photometric Data
• The Infrared Medium-deep Survey. VIII. Quasar Luminosity Function at $z\sim 5$
• ALMA Observations of Quasar Host Galaxies at $z\simeq 4.8$
• The fraction and kinematics of broad absorption line quasars across cosmic time
• The WISSH quasars project V. ALMA reveals the assembly of a giant galaxy around a z=4.4 hyper-luminous QSO
• Probing the $z\gtrsim 6$ quasars in a universe with IllustrisTNG physics: Impact of gas-based black hole seeding models
• X-ray properties of z>6.5 quasars
• J0906+6930: a radio-loud quasar in the early Universe
• Super-critical accretion of medium-weight seed black holes in gaseous proto-galactic nuclei
• Sowing black hole seeds: Direct collapse black hole formation with realistic Lyman-Werner radiation in cosmological simulations
• No Ly$\alpha$ emitters detected around a QSO at z=6.4: Suppressed by the QSO?
• Warm Dark Matter and Cosmic Reionization
• Stellar collisions in flattened and rotating Pop. III star clusters
• A comprehensive view of the interstellar medium in a quasar host galaxy at z~6.4
• Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z$\approx 5.5$
• The Extremely Luminous Quasar Survey in the Pan-STARRS 1 Footprint (PS-ELQS)
• Random Forests as a viable method to select and discover high redshift quasars
• Global instability by runaway collisions in nuclear stellar clusters: Numerical tests of a route for massive black hole formation
• The host galaxies of z=7 quasars: predictions from the BlueTides simulation
• The hyperluminous Compton-thick $z\sim 2$ quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR
• Steep Hard-X-ray Spectra Indicate Extremely High Accretion Rates in Weak Emission-Line Quasars
• Survey of Extremely High-velocity Outflows in Sloan Digital Sky Survey Quasars
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) XII. Extended [C II] Structure (Merger or Outflow) in a z = 6.72 Red Quasar
• XMM-Newton observations of the extremely X-ray luminous quasar CFHQS J142952+544717=SRGE J142952.1+544716 at redshift z=6.18
• A unified model for the clustering of quasars and galaxies at $z\approx 6$
• The effect of inhomogeneous reionisation on the Lyman-$\alpha$ forest power spectrum at redshift $z>4$: implications for thermal parameter recovery
• X-ray spectroscopy of the z=6.4 quasar J1148+5251
• A quasar-galaxy merger at $z\sim 6.2$: rapid host growth via accretion of two massive satellite galaxies
• Mapping quasar light echoes in 3D with Lyα forest tomography
• 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
• Spectral Energy Distributions of Companion Galaxies to z$\sim$6 Quasars
• Measuring the Density Fields around Bright Quasars at $z\sim 6$ with XQR-30 Spectra
• High-redshift SMBHs can grow from stellar-mass seeds via chaotic accretion
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z~6
• Evolution of Neutral Oxygen During the Epoch of Reionization and its Use in Estimating the Neutral Hydrogen Fraction
• Observing the host galaxies of high-redshift quasars with JWST: predictions from the BlueTides simulation
• Fast jet proper motion discovered in a blazar at z = 4.72
• Chandra and Magellan/FIRE follow-up observations of PSO167-13: an X-ray weak QSO at $z=6.515$
• Observational properties of a general relativistic instability supernova from a primordial supermassive star
• GA-NIFS and EIGER: A merging quasar host at z=7 with an overmassive black hole
• New quasar proximity zone size measurements at $z\sim 6$ using the enlarged XQR-30 sample
• Blazar nature of high-z radio-loud quasars
• The Extremely Luminous Quasar Survey (ELQS) in the Sloan Digital Sky Survey footprint. II. The North Galactic Cap Sample
• The rapid transition from star-formation to AGN dominated rest-frame UV light at z ~ 4
• New Radio-Loud QSOs at the end of the Re-ionisation Epoch
• The comoving mass density of MgII from $z\sim 2$ to $5.5$
• X-ray properties and obscured fraction of AGN in the J1030 Chandra field
• Resolving the interstellar medium in the nuclear region of two z=5.78 quasar host galaxies with ALMA
• The Infrared Medium-deep Survey. VI. Discovery of Faint Quasars at $z\sim 5$ with a Medium-band-based Approach
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of Two Red Quasars at z > 5.6
• 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
• SCUBA2 High Redshift Bright Quasar Survey: Far-infrared Properties and Weak-line Features
• Growth of Massive Black-Holes in FFB Galaxies at Cosmic Dawn
• Truth or delusion? A possible gravitational lensing interpretation of the ultra-luminous quasar SDSS J010013.02+280225.8 at $z=6.30$
• Chemical abundances along the quasar main sequence
• VLBI observations of VIK J2318-3113, a quasar at z = 6.44
• X-ray emission from a rapidly accreting narrow-line Seyfert 1 galaxy at z=6.56
• A Mixture of LBG Overdensities in the Fields of Three $6<z<7$ Quasars: Implications for the Robustness of Photometric Selection
• The GLEAMing of the First Supermassive Black Holes
• Ionization bias and the ghost proximity effect near $z\gtrsim 6$ quasars in the shadow of proximate absorption systems
• The Infrared Medium-deep Survey. \Romannum{7}. Faint Quasars at $z\sim 5$ in the ELAIS-N1 Field
• Efficiency of black hole formation via collisions in stellar systems: An analysis of data from simulations and observations
• Milli-arcsecond imaging of the radio emission from the quasar with the most massive black hole at reionization
• Supermassive black hole formation via collisions in black hole clusters
• UNCOVERing the High-redshift AGN Population among Extreme UV Line Emitters
• On the Absence of High-Redshift AGNs: Little Growth in the Supermassive Black Hole Population at High Redshifts
• The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn
• Statistical Detection of IGM Structures during Cosmic Reionization using Absorption of the Redshifted 21 cm line by HI against Compact Background Radio Sources
• Conditions for direct black hole seed collapse near a radio-loud quasar 1 Gyr after the Big Bang
• What do observations tell us about the highest-redshift supermassive black holes?
• Discovery of a very Lyman-$\alpha$-luminous quasar at z=6.62
• No redshift evolution in the rest-frame UV emission line properties of quasars from z=1.5 to z=4.0
• Shedding New Light on Weak Emission-Line Quasars in the C${}_{\mathrm{IV}}$-H$\beta$ Parameter Space
• Large Scale Overdensity of Lyman Break Galaxies Around the z=6.3 Ultraluminous Quasar J0100+2802
• Constraints On Duty Cycles Of Quasars At Z $\sim$ 6
• Molecular gas and dust properties in $z>7$ quasar hosts
• Paving the Way for Euclid and JWST via Optimal Selection of High-z Quasars
• The Role of Quasar Radiative Feedback on Galaxy Formation during Cosmic Reionization
• The ALPINE-ALMA [CII] survey: double stellar population and AGN activity in a galaxy at $z\sim 5.5$
• JADES reveals a large population of low mass black holes at high redshift
• Investigating the nuclear properties of highly accreting active galactic nuclei with XMM-Newton
• Radio-loud fraction of z>6 quasars
• Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with the Extragalactic Serendipitous Swift Survey
• XXL-HSC: An updated catalogue of high-redshift ($z⩾3.5$) X-ray AGN in the XMM-XXL northern field. Constraints on the bright end of the soft logN-logS
• The impact of faint AGN discovered by JWST on reionization
• Joint Survey Processing I: Compact oddballs in the COSMOS field -- low-luminosity Quasars at z > 6?
• SHELLQs-JWST Unveils the Host Galaxies of 12 Quasars at z>6
• Evolution of the mass relation between supermassive black holes and dark matter halos across the cosmic time
• An X-ray fading, UV brightening QSO at $z\approx 6$
• Magnetic Effects Promote Supermassive Star Formation in Metal-enriched Atomic-cooling Halos
• Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multi-band surveys
• VEXAS: VISTA EXtension to Auxiliary Surveys -- Data Release 2: Machine-learning based classification of sources in the Southern Hemisphere
• Prospects for Observing High-redshift Radio-loud Quasars in the SKA Era: Paving the Way for 21-cm Forest Observations
• Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly$\alpha$ halos
• The host galaxies of radio-loud quasars at z>5 with ALMA
• High Star Formation Rates of Low Eddington Ratio Quasars at $z\gtrsim 6$
• A Physical Model for the Quasar Luminosity Function Evolution between Cosmic Dawn and High Noon
• Multi-wavelength properties of three new radio-powerful $z\sim 5.6$ quasi-stellar objects discovered from RACS
• The benefit of simultaneous seven-filter imaging: 10 years of GROND observations
• A variable active galactic nucleus at $z=2.06$ triply-imaged by the galaxy cluster MACS J0035.4-2015
• When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data
• VEXAS: the VISTA EXtension to Auxiliary Surveys -- Data Release 1: the Southern Galactic Hemisphere
• The Infrared Medium-deep Survey. IX. Discovery of Two New $z\sim 6$ Quasars and Space Density down to $M_{1450}\sim -23.5$ mag
• Structure of the super-Eddington outflow and itsimpact on the cosmological scale
• The Decoupled Kinematics of high-z QSO Host Galaxies and their Lya halos
• Optical and near-infrared spectroscopy of quasars at $z>6.5$: public data release and composite spectrum
• Effects of the Hubble Parameter on the Cosmic Growth of the First Quasars
• Euclid preparation. Observational expectations for redshift z<7 active galactic nuclei in the Euclid Wide and Deep surveys
• Comprehensive view on a $z\sim 6.5$ radio-loud QSO: from the radio to the optical/NIR to the X-ray band
• Strong Lensed QSOs with Variability Detectable by LSST: How many are there?
• Plausible association of distant late M dwarfs with low-frequency radio emission
• High-$z$ Universe probed via Lensing by QSOs (HULQ) I. Number Estimates of QSO-QSO and QSO-Galaxy Lenses
• Revealing new high redshift quasar populations through Gaussian mixture model selection
• An Optically Faint Quasar Survey at z~5 in the CFHTLS Wide Field: Estimates of the Black Hole Masses and Eddington Ratios
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
• Astrophysics with the Laser Interferometer Space Antenna
• HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe
• High-redshift quasar selection from the CFHQSIR survey
• Revealing faint compact radio jets at redshifts above 5 with very long baseline interferometry
• Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies
• Euclid: The potential of slitless infrared spectroscopy: A z=5.4 quasar and new ultracool dwarfs
• Galaxies into the Dark Ages
• The Dawn of Black Holes
• JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
• The quasar luminosity function at $z\sim 5$ via deep learning and Bayesian information criterion
• Rapidly accreting black hole of the Lyα-luminous quasar PSO J006.1240+39.2219
• Searching for [CII] Emission from the First Sample of $z\sim 6$ OI Absorption-Associated Galaxies with ALMA
• A method for checking high-redshift identification of radio AGNs
• Gravitational collapse at low to moderate Mach numbers: The relationship between star formation efficiency and the fraction of mass in the massive object
• Shedding the envelope: JWST reveals a kiloparsec-scale [OIII]-weak Balmer shell around a z=7.64 quasar
• Discovery of two quasars at $z=5$ from the OGLE Survey
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XIV. A Candidate Type-II Quasar at z=6.1292
• Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at $z\gtrsim 6$ Shows No Evidence of Lensing
• The clustering of C IV and Si IV at the end of reionisation: A perspective from the E-XQR-30 survey
• 4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting
• Milliarcsecond-resolution Radio-imaging Survey of Blazar Candidates at 4 < z < 5.4
• Gemini Near Infrared Spectrograph$-$Distant Quasar Survey: the Chandra View
• Rapid sinking and efficient mergers of supermassive black holes in compact high-redshift galaxies
• A Super-Eddington, Lensing-Magnified Quasar at $z=5.07$ observed with JWST
• Black Hole merger rates in the first billion years in light of JWST data
• X-Ray Evidence Against the Hypothesis that the Hyper-Luminous z=6.3 Quasar J0100+2802 is Lensed
• The Impact of Powerful Jets on the Far-infrared Emission of an Extreme Radio Quasar at z~6
• Quasar clustering at redshift 6
• High-$z$ Universe probed via Lensing by QSOs (HULQ) II. Deep GMOS spectroscopy of a QSO lens candidate
• 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
• X-HESS: a large sample of highly accreting serendipitous AGN under the XMM-Newton microscope
• Can X-ray Observations Improve Optical-UV-based Accretion-Rate Estimates for Quasars?