Discovery of a redshift 6.13 quasar in the UKIRT Infrared Deep Sky Survey

Abstract

Optical and near-infrared (NIR) spectra are presented for ULAS J131911.29+095951.4 (hereafter ULAS J1319+0950), a new redshift z = 6.127 +/- 0.004 quasar discovered in the Third Data Release (DR3) of the UKIRT Infrared Deep Sky Survey (UKIDSS). The source has Y_Vega = 19.10 +/- 0.03, corresponding to M_1450,AB = -27.12, which is comparable to the absolute magnitudes of the z ~= 6 quasars discovered in the SDSS. ULAS J1319+0950 was, in fact, registered by SDSS as a faint source with z_AB = 20.1 +/- 0.1, just below the signal--to--noise ratio limit of the SDSS high-redshift quasar survey. The faint z-band magnitude is a consequence of the weak Ly alpha/N V emission line, which has a rest-frame equivalent width of only ~20 A and provides only a small boost to the z-band flux. Nevertheless, there is no evidence from this UKIDSS-based search for a significant population of high-redshift quasars with weak emission lines. The Ly alpha optical depth to ULAS J1319+0950 is consistent with that measured towards similarly distant SDSS quasars, implying that results from optical- and NIR-selected quasars may be combined. Also presented is a new NIR-spectrum of the previously discovered UKIDSS quasar ULAS J020332.38+001229.2, which reveals the object to be a broad absorption line quasar. The new spectrum shows that the emission line previously identified as Ly alpha is actually N V, leading to a revised redshift of z = 5.72, rather than z = 5.86 as previously estimated.

A&A in press; 8 pages, 7 figures; author list corrected

References in corpus (19)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• The UKIRT Infrared Deep Sky Survey ZYJHK Photometric System: Passbands and Synthetic Colours
• The Fifth Data Release of the Sloan Digital Sky Survey
• The WFCAM Science Archive
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
• A galaxy at a redshift z = 6.96
• 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
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• The UKIRT Infrared Deep Sky Survey Early Data Release
• The UKIRT Infrared Deep Sky Survey First Data Release
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• High-Redshift SDSS Quasars with Weak Emission Lines
• The discovery of the first luminous z~6 quasar in the UKIDSS Large Area Survey
• An Exploratory Search for z~6 Quasars in the UKIDSS Early Data Release
• The Impact of HI in Galaxies on 21-cm Intensity Fluctuations During the Reionisation Epoch

Cited by in corpus (62)

• The Canada-France High-z Quasar Survey: nine new quasars and the luminosity function at redshift 6
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• 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
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Hydrogen reionisation ends by $z=5.3$: Lyman-$\alpha$ optical depth measured by the XQR-30 sample
• Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• The extinction law at high redshift and its implications
• Discovery of eight z ~ 6 quasars from Pan-STARRS1
• Constraining the radio-loud fraction of quasars at z>5.5
• The compact, ~1 kpc host galaxy of a quasar at z=7.1
• 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
• The X-SHOOTER/ALMA sample of Quasars in the Epoch of Reionization. I. NIR spectral modeling, iron enrichment and broad emission line properties
• Metals in the IGM approaching the re-ionization epoch: results from X-shooter at the VLT
• 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
• Constraints on the Universal CIV Mass Density at z~6 from Early IR Spectra Obtained with the Magellan FIRE Spectrograph
• Two bright z > 6 quasars from VST ATLAS and a new method of optical plus mid-infra-red colour selection
• XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
• The galaxy environment of a QSO at z ~ 5.7
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) III. Star formation properties of the host galaxies at $z\gtrsim 6$ studied with ALMA
• 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
• Gas dynamics of a luminous $z$ = 6.13 quasar ULAS J1319$+$0950 revealed by ALMA high resolution observations
• Heavy Element Absorption Systems at $5.0<z<6.8$: Metal-Poor Neutral Gas and a Diminishing Signature of Highly Ionized Circumgalactic Matter
• The dust content of QSO hosts at high redshift
• Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
• Probabilistic selection of high-redshift quasars
• Complete infrared spectral energy distributions of mm detected quasars at z>5
• A Cross-Match of 2MASS and SDSS. II. Peculiar L Dwarfs, Unresolved Binaries, and the Space Density of T Dwarf Secondaries
• Dynamical Characterization of Galaxies at z~4-6 via Tilted Ring Fitting to ALMA [CII] Observations
• A New Method to Measure the Post-Reionization Ionizing Background from the Joint Distribution of Lyman-$\alpha$ and Lyman-$\beta$ Forest Transmission
• Chronicling the reionization history at $6\lesssim z\lesssim 7$ with emergent quasar damping wings
• A comparison of quasar emission reconstruction techniques for $z\ge 5.0$ Lyman-$\alpha$ and Lyman-$\beta$ transmission
• The Contribution of Host Galaxies to the Infrared Energy Output of $z\gtrsim 5.0$ QUASARS
• Constraining the quasar radio-loud fraction at $z\sim 6$ with deep radio observations
• Star Formation and ISM Properties in Host Galaxies of Three Far-infrared Luminous Quasars at $z\sim 6$
• The role of galaxies and AGN in reionizing the IGM - II: metal-tracing the faint sources of reionization at $5\lesssim z\lesssim 6$
• The Pan-STARRS1 $\mathbf{z}>5.6$ Quasar Survey: III. The $\mathbf{z}\approx 6$ Quasar Luminosity Function
• A new bright z=6.82 quasar discovered with VISTA: VHS J0411-0907
• Constraints on high-J CO emission lines in $z\sim 6$ quasars
• Limits to Rest-Frame Ultraviolet Emission From Far-Infrared-Luminous z~6 Quasar Hosts
• The Near and Mid-infrared photometric properties of known redshift $z\ge 5$ Quasars
• A spectral stacking analysis to search for faint outflow signatures in z~6 quasars
• No Evidence for Millimeter Continuum Source Overdensities in the Environments of $z\gtrsim 6$ Quasars
• Quasars as probes of cosmological reionization
• The comoving mass density of MgII from $z\sim 2$ to $5.5$
• WISE detections of known QSOs at redshifts greater than six
• New quasar proximity zone size measurements at $z\sim 6$ using the enlarged XQR-30 sample
• Resolving the interstellar medium in the nuclear region of two z=5.78 quasar host galaxies with ALMA
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of Two Red Quasars at z > 5.6
• Selection constraints on high redshift quasar searches in the VISTA kilo-degree infrared galaxy survey
• The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
• Extreme Galaxies During Reionization: Testing ISM and Disk Models
• Formation of the First Black Holes: Current observational status
• The Noctua Suite of Simulations -- The Difficulty of Growing Massive Black Holes in Low-Mass Dwarf Galaxies
• Euclid: The potential of slitless infrared spectroscopy: A z=5.4 quasar and new ultracool dwarfs
• Shedding the envelope: JWST reveals a kiloparsec-scale [OIII]-weak Balmer shell around a z=7.64 quasar