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Author
dc.contributor.author
Fan, XH 
Author
dc.contributor.author
Hennawi, JF 
Author
dc.contributor.author
Richards, GT 
Author
dc.contributor.author
Strauss, MA 
Author
dc.contributor.author
Schneider, DP 
Author
dc.contributor.author
Donley, JL 
Author
dc.contributor.author
Young, JE 
Author
dc.contributor.author
Annis, J 
Author
dc.contributor.author
Lin, H 
Author
dc.contributor.author
Lampeitl, H 
Availability Date
dc.date.accessioned
2020-08-08T20:20:53Z
Availability Date
dc.date.available
2020-08-08T20:20:53Z
Release
dc.date.issued
2004
uri
dc.identifier.uri
http://hdl.handle.net/10831/49234
Abstract
dc.description.abstract
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 similar to1700 deg(2) of new SDSS Main Survey imaging in the northern Galactic cap. An additional quasar, at redshift 5.85, was discovered by co-adding 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 nonstandard 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 the other three z greater than or similar to 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 similar to 6 quasars exhibit no significant evolution compared with 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 similar to 6 is (6 +/- 2) x 10(-10) Mpc(-3) (H-0 = 65 km s(-1) Mpc(-1), Omega = 0.35, and Lambda = 0.65), consistent with our previous estimates. The luminosity distribution of the sample is fitted with a power-law luminosity function Psi( L) proportional to L-3.2 +/- 0.7, somewhat steeper than but consistent with our previous estimates.
Language
dc.language
Angol
Title
dc.title
A survey of z > 5.7 quasars in the Sloan Digital Sky Survey. III. Discovery of five additional quasars
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-06-05T12:24:06Z
Scope
dc.format.page
515-522
Doi ID
dc.identifier.doi
10.1086/422434
Wos ID
dc.identifier.wos
000223099600001
ID Scopus
dc.identifier.scopus
4544295232
MTMT ID
dc.identifier.mtmt
3130992
Issue Number
dc.identifier.issue
2
abbreviated journal
dc.identifier.jabbrev
ASTRON J
Journal
dc.identifier.jtitle
ASTRONOMICAL JOURNAL
Volume Number
dc.identifier.volume
128
Release Date
dc.description.issuedate
2004
department of Author
dc.contributor.institution
Fizikai Intézet
department of Author
dc.contributor.institution
Eötvös Gravity Research Group
department of Author
dc.contributor.institution
Atomfizikai Tanszék


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A survey of z > 5.7 quasars in the Sloan Digital Sky Survey. III. Discovery of five additional quasars
 

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