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Discovery of a redshift 6.13 quasar in the UKIRT infrared deep sky survey

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Title: Discovery of a redshift 6.13 quasar in the UKIRT infrared deep sky survey
Authors: Mortlock, DJ
Patel, M
Warren, SJ
Venemans, BP
McMahon, RG
Hewett, PC
Simpson, C
Sharp, RG
Burningham, B
Dye, S
Ellis, S
Gonzales-Solares, EA
Huelamo, N
Item Type: Journal Article
Abstract: Optical and near-infrared (NIR) spectra are presented for ULAS J131911.29+095051.4 (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 = 19.10 ± 0.03, corresponding to = -27.12, which is comparable to the absolute magnitudes of the z 6 quasars discovered in the Sloan Digital Sky Survey (SDSS). ULAS J1319+0950 was, in fact, registered by SDSS as a faint source with = 20.13 ± 0.12, 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 α/N V emission line, which has a rest-frame equivalent width of ~20Å and provides only a small boost to the z-band flux. Nevertheless, there is no evidence of a significant new population of high-redshift quasars with weak emission lines from this UKIDSS-based search. The Ly α 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 in studies of cosmological reionization. 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 initially identified as Ly α is actually N V, leading to a revised redshift of z = 5.72, rather than z = 5.86 as previously estimated.
Issue Date: 1-Oct-2009
Date of Acceptance: 17-Apr-2009
URI: http://hdl.handle.net/10044/1/73488
DOI: https://doi.org/10.1051/0004-6361/200811161
ISSN: 0004-6361
Publisher: EDP Sciences
Start Page: 97
End Page: 104
Journal / Book Title: Astronomy and Astrophysics: a European journal
Volume: 505
Issue: 1
Copyright Statement: © 2009 ESO.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/G001901/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: quasars: individual: ULAS J020332.38+001229.2, ULAS J131911.29+095051.4
infrared: general
cosmology: observations
EARLY DATA RELEASE
BLACK-HOLE MASSES
Z-SIMILAR-TO-6 QUASARS
Z-GREATER-THAN-5.7 QUASARS
ADDITIONAL QUASARS
EMISSION-LINES
SDSS QUASARS
3C 273
REIONIZATION
ABSORPTION
Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: quasars: individual: ULAS J020332.38+001229.2, ULAS J131911.29+095051.4
infrared: general
cosmology: observations
EARLY DATA RELEASE
BLACK-HOLE MASSES
Z-SIMILAR-TO-6 QUASARS
Z-GREATER-THAN-5.7 QUASARS
ADDITIONAL QUASARS
EMISSION-LINES
SDSS QUASARS
3C 273
REIONIZATION
ABSORPTION
astro-ph
astro-ph
Astronomy & Astrophysics
0201 Astronomical and Space Sciences
Publication Status: Published
Online Publication Date: 2009-06-22
Appears in Collections:Physics
Astrophysics