A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey III: Discovery of Five Additional Quasars

Simple item page
dc.creatorFan, Xiaohui
dc.creatorHennawi, Joseph F.
dc.creatorRichards, Gordon T.
dc.creatorStrauss, Michael A.
dc.creatorSchneider, Donald P.
dc.creatorDonley, Jennifer L.
dc.creatorYoung, Jason E.
dc.creatorAnnis, James
dc.creatorLin, Huan
dc.creatorLampeitl, Hubert
dc.creatorLupton, Robert H.
dc.creatorGunn, James E.
dc.creatorKnapp, Gillan R.
dc.creatorBrandt, W. N.
dc.date2004-05-07
dc.date.accessioned2026-07-07T10:27:13Z
dc.date.available2026-07-07T10:27:13Z
dc.descriptionWe 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.
dc.descriptionAJ in press (Aug 2004), 18 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0405138
dc.identifierhttp://arxiv.org/abs/astro-ph/0405138
dc.identifierAstron.J.128:515,2004
dc.identifierdoi:10.1086/422434
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177086
dc.subjectAstrophysics
dc.titleA Survey of z>5.7 Quasars in the Sloan Digital Sky Survey III: Discovery of Five Additional Quasars
dc.typetext

Files

Collections

arXiv