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Title:
Discovery of a Radio-selected z ~ 6 Quasar
Authors:
Zeimann, Gregory R.; White, Richard L.; Becker, Robert H.; Hodge, Jacqueline A.; Stanford, Spencer A.; Richards, Gordon T.
Affiliation:
AA(Department of Physics, University of California, Davis, CA 95616, USA), AB(Space Telescope Science Institute, Baltimore, MD 21218, USA), AC(Department of Physics, University of California, Davis, CA 95616, USA ; IGPP/Lawrence Livermore National Laboratory, Livermore, CA 94550, USA), AD(Department of Physics, University of California, Davis, CA 95616, USA ; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AE(Department of Physics, University of California, Davis, CA 95616, USA ; IGPP/Lawrence Livermore National Laboratory, Livermore, CA 94550, USA), AF(Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA)
Publication:
The Astrophysical Journal, Volume 736, Issue 1, article id. 57, 8 pp. (2011). (ApJ Homepage)
Publication Date:
07/2011
Origin:
IOP
Astronomy Keywords:
quasars: general, quasars: individual: SDSS J222843.54+011032.2
DOI:
10.1088/0004-637X/736/1/57
Bibliographic Code:
2011ApJ...736...57Z

Abstract

We present the discovery of only the second radio-selected z ~ 6 quasar. We identified SDSS J222843.54+011032.2 (z = 5.95) by matching the optical detections of the deep Sloan Digital Sky Survey Stripe 82 with their radio counterparts in the Stripe 82 Very Large Array Survey. We also matched the Canadian-France-Hawaiian Telescope Legacy Survey Wide with the Faint Images of the Radio Sky at Twenty cm survey but have yet to find any z ~ 6 quasars in this survey area. The discovered quasar is optically faint, z = 22.3 and M 1450 ~ -24.5, but radio bright, with a flux density of f 1.4 GHz, peak = 0.31 mJy and a radio loudness of R ~ 1100 (where R ≡ f 5 GHz/f 2500). The i - z color of the discovered quasar places it outside the color selection criteria for existing optical surveys. We conclude by discussing the need for deeper wide-area radio surveys in the context of high-redshift quasars.
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