Discovery of eight z ~ 6 quasars from Pan-STARRS1

Abstract

High-redshift quasars are currently the only probes of the growth of supermassive black holes and potential tracers of structure evolution at early cosmic time. Here we present our candidate selection criteria from the Panoramic Survey Telescope & Rapid Response System 1 and follow-up strategy to discover quasars in the redshift range 5.7<z<6.2. With this strategy we discovered eight new 5.7<z<6.0 quasars, increasing the number of known quasars at z>5.7 by more than 10%. We additionally recovered 18 previously known quasars. The eight quasars presented here span a large range of luminosities (-27.3 < M_{1450} < -25.4; 19.6 < z_ps1 < 21.2) and are remarkably heterogeneous in their spectral features: half of them show bright emission lines whereas the other half show a weak or no Ly$\alpha$ emission line (25% with rest-frame equivalent width of the Ly$\alpha$ + Nv line lower than 15Å). We find a larger fraction of weak-line emission quasars than in lower redshift studies. This may imply that the weak-line quasar population at the highest redshifts could be more abundant than previously thought. However, larger samples of quasars are needed to increase the statistical significance of this finding.

arXiv commentAJ in press, 16 pages, 5 figures, 7 tables

References in corpus (53)

• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• A luminous quasar at a redshift of z = 7.085
• The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• 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
• Observational constraints on Cosmic Reionization
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• The Canada-France High-z Quasar Survey: nine new quasars and the luminosity function at redshift 6
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars
• 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
• Clustering of High Redshift ($z\ge 2.9$) Quasars from the Sloan Digital Sky Survey
• 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
• Discovery of three z>6.5 quasars in the VISTA Kilo-degree Infrared Galaxy (VIKING) survey
• The Large APEX Bolometer Camera LABOCA
• A 3x10^9 solar mass black hole in the quasar SDSS J1148+5251 at z=6.41
• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• Evidence for non-evolving FeII/MgII ratios in rapidly accreting z~6 QSOs
• 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
• High-Redshift SDSS Quasars with Weak Emission Lines
• Thermal Emission from Warm Dust in the Most Distant Quasars
• Colour corrections for high redshift objects due to intergalactic attenuation
• Precise Throughput Determination of the PanSTARRS Telescope and the Gigapixel Imager using a Calibrated Silicon Photodiode and a Tunable Laser: Initial Results
• Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey
• Cold Accretion Disks and Lineless Quasars
• Discovery of a z=6.1 Radio-Loud Quasar in the NDWFS
• The discovery of the first luminous z~6 quasar in the UKIDSS Large Area Survey
• Discovery of a redshift 6.13 quasar in the UKIRT Infrared Deep Sky Survey
• Weak-Line Quasars at High Redshift: Extremely High Accretion Rates or Anemic Broad-Line Regions?
• The Discovery of Three New z>5 Quasars in the AGN and Galaxy Evolution Survey
• Probabilistic selection of high-redshift quasars
• The First High Redshift Quasar from Pan-STARRS
• First results from the Canada-France High-z Quasar Survey: Constraints on the z=6 quasar luminosity function and the quasar contribution to reionization
• 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
• SDSS J094533.99+100950.1 - the remarkable weak emission line quasar
• Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps
• The quasar M_bh - M_host relation through Cosmic Time I - Dataset and black hole masses
• Discovery of a Radio-Selected z ~ 6 Quasar
• Discovery of a new high redshift QSO at z=5.96 with the Subaru telescope
• The Pan-STARRS1 Small Area Survey 2
• Discovery of an Optically-Faint Quasar at z=5.70 and Implications for the Faint End of the Quasar Luminosity Function
• The Ultraviolet-to-Mid-Infrared Spectral Energy Distribution of Weak Emission Line Quasars
• WISE detections of known QSOs at redshifts greater than six

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