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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 448166.0, MPI für Astronomie / Publikationen_mpia
A survey of z ~ 6 quasars in the Sloan Digital Sky Survey deep stripe. II. Discovery of six quasars at z AB>21
Authors:Jiang, Linhua; Fan, Xiaohui; Bian, Fuyan; Annis, James; Chiu, Kuenley; Jester, Sebastian; Lin, Huan; Lupton, Robert H.; Richards, Gordon T.; Strauss, Michael A.; Malanushenko, Viktor; Malanushenko, Elena; Schneider, Donald P.
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astronomical Journal
Journal Abbrev.:AJ
Volume:138
Start Page:305
End Page:311
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present the discovery of six new quasars at z ~ 6 selected from the Sloan Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by repeatedly scanning a stripe along the celestial equator. The six quasars are about 2 mag fainter than the luminous z ~ 6 quasars found in the SDSS main survey and 1 mag fainter than the quasars reported in Paper I. Four of them comprise a complete flux-limited sample at 21 < z AB < 21.8 over an effective area of 195 deg2. The other two quasars are fainter than z AB = 22 and are not part of the complete sample. The quasar luminosity function at z ~ 6 is well described as a single power law Phi(L 1450) vprop L beta 1450 over the luminosity range --28 < M 1450 < --25. The best-fitting slope beta varies from --2.6 to --3.1, depending on the quasar samples used, with a statistical error of 0.3-0.4. About 40% of the quasars discovered in the SDSS southern survey have very narrow Lyalpha emission lines, which may indicate small black hole masses and high Eddington luminosity ratios, and therefore short black hole growth timescales for these faint quasars at early epochs.
Free Keywords:cosmology: observations; quasars: emission lines; quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009AJ....138..305J [ID No:1]
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