A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars

Abstract

We present the discovery of seven quasars at z>5.7, selected from ~2000 deg^2 of multicolor imaging data of the Sloan Digital Sky Survey (SDSS). The new quasars have redshifts z from 5.79 to 6.13. Five are selected as part of a complete flux-limited sample in the SDSS Northern Galactic Cap; two have larger photometric errors and are not part of the complete sample. One of the new quasars, SDSS J1335+3533 (z=5.93), exhibits no emission lines; the 3-sigma limit on the rest-frame equivalent width of Ly alpha+NV line is 5 A. It is the highest redshift lineless quasar known, and could be a gravitational lensed galaxy, a BL Lac object or a new type of quasar. Two new z>6 quasars, SDSS 1250+3130 (z=6.13) and SDSS J1137+3549 (z=6.01), show deep Gunn-Peterson absorption gaps in Ly alpha. These gaps are narrower the complete Gunn-Peterson absorption troughs observed among quasars at z>6.2 and do not have complete Ly beta absorption.

AJ in press, 16 pages, 3 figures

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• Milli-arcsecond imaging of the radio emission from the quasar with the most massive black hole at reionization
• Calibration Requirements for Epoch of Reionization 21-cm signal observations -- I. Effect of time-correlated gains
• The X-ray Properties of Million Solar Mass Black Holes
• The ESO UVES Advanced Data Products Quasar Sample - IV. On the deficiency of Argon in DLA systems
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• Detecting the Most Distant (z>7) Objects with ALMA
• Detecting the Highest Redshift (z > 8) QSOs in a Wide, Near Infrared Slitless Spectroscopic Survey
• Models of high redshift luminosity functions and galactic outflows: The dependence on halo mass function
• Light or heavy supermassive black hole seeds: the role of internal rotation in the fate of supermassive stars
• Clumping factors of HII, HeII and HeIII
• Quasar UV Luminosity Function at $3.5<z<5.0$ from SDSS Deep Imaging Data
• The physical origin of super-competitive accretion during the formation of the first supermassive black holes
• Massive black hole formation in Population III star clusters
• Strongly Coupled Dark Energy Cosmologies yielding large mass Primordial Black Holes
• Star formation in high redshift galaxies including Supernova feedback: effect on stellar mass and luminosity functions
• The ALPINE-ALMA [CII] survey: double stellar population and AGN activity in a galaxy at $z\sim 5.5$
• Final stage of merging binaries of supermassive black holes: observational signatures
• Radio-loud fraction of z>6 quasars
• Three-Dimensional Modelling of Ionized Gas. I. Did very massive stars of different metallicities drive the second cosmic reionization?
• Optical spectroscopy of SDSS J004054.65-0915268: three possible scenarios for the classification. A z \sim 5 BL Lacertae, blue FSRQ or a weak emission line quasar
• Probing the growth of supermassive black holes at z>6 with LOFAR
• Induced metal-free star formation around a massive black hole seed
• Is there another coincidence problem at the reionization epoch?
• Formation of the First Black Holes: Current observational status
• Searching for an Intermediate Mass Black Hole in the Blue Compact Dwarf galaxy MRK 996
• Obscured AGNs in Bulgeless Hosts discovered by WISE: The Case Study of SDSS J1224+5555
• Effects of the Hubble Parameter on the Cosmic Growth of the First Quasars
• Formation of supermassive stars in the first stellar clusters: Dependence on the gas temperature
• Redshifted 21cm Observations of High Redshift Quasar Proximity Zones
• An Optically Faint Quasar Survey at z~5 in the CFHTLS Wide Field: Estimates of the Black Hole Masses and Eddington Ratios
• The chemical evolution of self-gravitating primordial disks
• Radio recombination lines from obscured quasars with the SKA
• Exploring Gravitationally-Lensed $z\gtrsim 6$ X-ray AGN Behind the RELICS clusters
• Project Lyman
• Unravelling the formation of the first supermassive black holes with the SKA pulsar timing array
• Can supermassive stars form in protogalaxies due to internal Lyman-Werner feedback?
• Growth problems of stellar black holes in early galaxies
• Constraining Dynamical Dark Energy Models through the Abundance of High-Redshift Supermassive Black Holes
• Turbulent gas accretion between supermassive black holes and star-forming rings in the circumnuclear disk
• Maximally Rotating Supermassive Stars at the Onset of Collapse: Effects of Gas Pressure
• Massive Black Hole Mergers
• Negative feedback effects on star formation history and cosmic reionization
• Evidence of under-developed torus and broad-line region of weak emission line quasars based on their spectral energy distribution
• Formation and Growth of the First Supermassive Black Holes in MOG
• Exploring effects of IMF sampling and SN feedback injection on star formation and metallicity in ultra-faint dwarf galaxies
• Understanding Stellar Mass-Metallicity and Size Relations in Simulated Ultra-Faint Dwarf Galaxies
• VLBI observations of the high-redshift X-ray bright blazar SRGE J170245.3+130104
• Impact of reionization history on constraining primordial gravitational waves in future all-sky cosmic microwave background experiments
• 1 um Excess Sources in the UKIDSS - I. Three T Dwarfs in the SDSS Southern Equatorial Stripe
• Super-Eddington Growth Ceiling: Analytic Constraints on the Rapid Growth of Light-Seed Black Holes in Massive Clumps
• Finding the Most Distant Quasars Using Bayesian Selection Methods
• The haloes that reionized the Universe
• Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at $z\gtrsim 6$ Shows No Evidence of Lensing
• Star Formation in Quasar Host Galaxies at Redshift 6: Millimeter Surveys and New Insights from ALMA
• First Light: Switching on Stars at the Dawn of Time
• Robust mixtures in the presence of measurement errors