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VII/252 ==OBSOLETE version of Catalogue==
23-Jun-2010: (by Francois Ochsenbein) See VII/260
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VII/252
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Beginning of ReadMe :VII/252 SDSS-DR5 quasar catalog (Schneider+, 2007)
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The Sloan Digital Sky Survey quasar catalog. IV. Fifth data release.
Schneider D.P., Hall P.B., Richards G.T., Strauss M.A., Vanden Berk D.E.,
Anderson S.F., Brandt W.N., Fan X., Jester S., Gray J., Gunn J.E.,
Subbarao M.U., Thakar A.R., Stoughton C., Szalay A.S., Yanny B., York D.G.,
Bahcall N.A., Barentine J., Blanton M.R., Brewington H., Brinkmann J.,
Brunner R.J., Castander F.J., Csabai I., Frieman J.A., Fukugita M.,
Harvanek M., Hogg D.W., Ivezic Z., Kent S.M., Kleinman S.J., Knapp G.R.,
Kron R.G., Krzesinski J., Long D.C., Lupton R.H., Nitta A., Pier J.R.,
Saxe D.H., Shen Y., Snedden S.A., Weinberg D.H., Wu J.
<Astron. J., 134, 102-117 (2007)>
=2007AJ....134..102S
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ADC_Keywords: QSOs ; Surveys ; Photometry, SDSS ; Redshifts
Keywords: catalogs ; quasars: general ; surveys
Abstract:
The fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar
Catalog, made from the SDSS Fifth Data Release, contains 77,429
objects; this is an increase of over 30,000 entries since the previous
edition (Schneider et al., Cat. VII/243). The catalog consists of
the objects in the SDSS Fifth Data Release that have luminosities
larger than M_i_=-22.0 (in a cosmology with Ho=70km.s-1.Mpc-1,
Omega_M_=0.3, and Omega_Lambda_=0.7), have at least one emission
line with FWHM larger than 1000km.s-1 or have interesting or complex
absorption features, are fainter than i 15.0, and have highly reliable
redshifts. The area covered by the catalog is about 5740deg^2^. The
quasar redshifts range from 0.08 to 5.41, with a median value of 1.48;
the catalog includes 891 quasars at redshifts greater than 4, of which
36 are at redshifts greater than 5. Approximately half of the catalog
quasars have i<19; nearly all have i<21. For each object the catalog
presents positions accurate to better than 0.2" rms per coordinate,
five-band (ugriz) CCD-based photometry with typical accuracy of
0.03mag, and information on the morphology and selection method. The
catalog also contains basic radio, near-infrared, and X-ray emission
properties of the quasars, when available, from other large-area
surveys. The calibrated digital spectra cover the wavelength region
3800-9200AA at a spectral resolution of about 2000; the spectra can
be retrieved from the public database using the information provided
in the catalog. The average SDSS colors of quasars as a function of
redshift, derived from the catalog entries, are presented in tabular
form. Approximately 96% of the objects in the catalog were discovered
by the SDSS.