Journal article
A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey III: Discovery of Five Additional Quasars
The Astronomical journal, v 128(2), pp 515-522
07 May 2004
Abstract
Astron.J.128:515,2004 We present the discovery of five new quasars at z>5.7, selected from the
multicolor imaging data of the Sloan Digital Sky Survey (SDSS). Three of them,
at redshifts 5.93, 6.07, and 6.22, were selected from ~1700 deg^2 of new SDSS
Main Survey imaging in the Northern Galactic Cap. An additional quasar, at
redshift 5.85, was discovered by coadding the data obtained in the Fall
Equatorial Stripe in the SDSS Southern Survey Region. The fifth object, at
redshift 5.80, is selected from a non-standard SDSS scan in the Southern
Galactic Cap outside the Main Survey area. The spectrum of SDSS
J162331.81+311200.5 (z=6.22) shows a complete Gunn-Peterson trough at z_abs >
5.95, similar to the troughs detected in other three z>6.2 quasars known. We
present a composite spectrum of the z>5.7 quasars discovered in the SDSS to
date. The average emission line and continuum properties of z~6 quasars exhibit
no significant evolution compared to those at low redshift. Using a complete
sample of nine z>5.7 quasars, we find that the density of quasars with M_1450 <
-26.7 at z~6 is (6+/-2) x 10^-10 per Mpc^3 consistent with our previous
estimates. The luminosity distribution of the sample is fit with a power law
luminosity function Psi(L) ~ L^(-3.2+/-0.7), somewhat steeper than but
consistent with our previous estimates.
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Details
- Title
- A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey III: Discovery of Five Additional Quasars
- Creators
- Xiaohui FanJoseph F HennawiGordon T RichardsMichael A StraussDonald P SchneiderJennifer L DonleyJason E YoungJames AnnisHuan LinHubert LampeitlRobert H LuptonJames E GunnGillan R KnappW. N Brandt
- Publication Details
- The Astronomical journal, v 128(2), pp 515-522
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000223099600001
- Scopus ID
- 2-s2.0-4544295232
- Other Identifier
- 991019201495104721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics