Imperial College London
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ProfessorStephenWarren

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7554s.j.warren Website

 
 
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Location

 

1115Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Mortlock:2009:0004-6361/200811161,
author = {Mortlock, DJ and Patel, M and Warren, SJ and Venemans, BP and McMahon, RG and Hewett, PC and Simpson, C and Sharp, RG and Burningham, B and Dye, S and Ellis, S and Gonzales-Solares, EA and Huelamo, N},
doi = {0004-6361/200811161},
journal = {Astronomy and Astrophysics: a European journal},
pages = {97--104},
title = {Discovery of a redshift 6.13 quasar in the UKIRT infrared deep sky survey},
url = {http://dx.doi.org/10.1051/0004-6361/200811161},
volume = {505},
year = {2009}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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+0950was, 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 Vemission line, which has a rest-frame equivalent width of ~20Åand 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 αoptical depth to ULAS J1319+0950is 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 αis actually N V, leading to a revised redshift of z = 5.72, rather than z = 5.86 as previously estimated.
AU  - Mortlock,DJ
AU  - Patel,M
AU  - Warren,SJ
AU  - Venemans,BP
AU  - McMahon,RG
AU  - Hewett,PC
AU  - Simpson,C
AU  - Sharp,RG
AU  - Burningham,B
AU  - Dye,S
AU  - Ellis,S
AU  - Gonzales-Solares,EA
AU  - Huelamo,N
DO  - 0004-6361/200811161
EP  - 104
PY  - 2009///
SN  - 0004-6361
SP  - 97
TI  - Discovery of a redshift 6.13 quasar in the UKIRT infrared deep sky survey
T2  - Astronomy and Astrophysics: a European journal
UR  - http://dx.doi.org/10.1051/0004-6361/200811161
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000270436000011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/73488
VL  - 505
ER  -
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