NBC Quasar Candidate Catalog J/ApJS/155/257 ivo://CDS.VizieR/J/ApJS/155/257 doi:10.26093/cds/vizier.21550257 CDS Richards G.T. Nichol R.C. Gray A.G. Brunner R.J. Lupton R.H.,Vanden Berk D.E. Chong S.S. Weinstein M.A. Schneider D.P.,Anderson S.F. Munn J.A. Harris H.C. Strauss M.A. Fan X. Gunn J.E.,Ivezic Z. York D.G. Brinkmann J. Moore A.W. 2011-02-03T08:53:05Z 2005-08-21T17:04:32Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars galaxies catalogs ultraviolet-astronomy We present a catalog of 100563 unresolved, UV-excess (UVX) quasar candidates to g=21 from 2099 deg^2^ of the Sloan Digital Sky Survey (SDSS) Data Release One (DR1) imaging data. Existing spectra of 22737 sources reveals that 22191 (97.6%) are quasars; accounting for the magnitude dependence of this efficiency, we estimate that 95502 (95.0%) of the objects in the catalog are quasars. Such a high efficiency is unprecedented in broadband surveys of quasars. This "proof-of-concept" sample is designed to be maximally efficient, but still has 94.7% completeness to unresolved, g~<19.5, UVX quasars from the DR1 quasar catalog. This efficient and complete selection is the result of our application of a probability density type analysis to training sets that describe the four-dimensional color distribution of stars and spectroscopically confirmed quasars in the SDSS. Specifically, we use a nonparametric Bayesian classification, based on kernel density estimation, to parameterize the color distribution of astronomical sources - allowing for fast and robust classification. We further supplement the catalog by providing photometric redshifts and matches to FIRST/VLA, ROSAT, and USNO-B sources. 2004ApJS..155..257R https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/155/257 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to http://www.sdss.org/ : the SDSS Home Page J/AJ/123/567 : SDSS quasar catalog, I: Early Data Release (Schneider+, 2002) J/AJ/126/2579 : SDSS quasar catalog. II. First data release (Schneider+, 2003) J/AJ/125/1817 : SDSS Early-Type Galaxies Catalog (Bernardi+, 2003) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/155/257 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/155/257 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/155/257 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/155/257 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/155/257 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/155/257 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/155/257/table1 (NBC Quasar Candidate Catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/155/257/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/155/257/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/155/257/table1? 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Should Not be used for identification. meta.record int [RNG2004] Unique catalog number meta.id;meta.main int Name The SDSS name (1) meta.id char RAJ2000 Right ascension in decimal degrees (J2000.0) deg pos.eq.ra;meta.main indexed DEJ2000 Declination in decimal degrees (J2000.0) deg pos.eq.dec;meta.main indexed ID SDSS Object ID string (2) meta.id char RPix Row position of object in field pix pos.cartesian;instr.det float CPix Column position of object in field pix pos.cartesian;instr.det float umag PSF SDSS u asinh magnitude (3) mag phot.mag;em.opt.U float e_umag Error in umag mag stat.error;phot.mag;em.opt.U float gmag PSF SDSS g asinh magnitude (3) mag phot.mag;em.opt.B float e_gmag Error in gmag mag stat.error;phot.mag;em.opt.B float rmag PSF SDSS r asinh magnitude (3) mag phot.mag;em.opt.R float e_rmag Error in rmag mag stat.error;phot.mag;em.opt.R float imag PSF SDSS i asinh magnitude (3) mag phot.mag;em.opt.I float e_imag Error in imag mag stat.error;phot.mag;em.opt.I float zmag PSF SDSS z asinh magnitude (3) mag phot.mag;em.opt.I float e_zmag Error in zmag mag stat.error;phot.mag;em.opt.I float Au Galactic extinction in the u band mag phys.absorption float Ag Galactic extinction in the g band mag phys.absorption float Ar Galactic extinction in the r band mag phys.absorption float Ai Galactic extinction in the i band mag phys.absorption float Az Galactic extinction in the z band mag phys.absorption float QDen KDE (Kernel Density Estimator) quasar density stat.fit.param double SDen KDE (Kernel Density Estimator) star density stat.fit.param double z Photometric redshift src.redshift.phot float e_z Lower limit in z stat.error;src.redshift float E_z Upper limit in z stat.error;stat.max float zProb Photometric redshift range probability stat.fit.goodness float r_class Origin of class: 2QZ or release number (4) meta.ref;pos.frame char class Previous catalog object classification (4) meta.code.class;src.class;meta.table char zPrev ? Previous catalog object redshift (5) src.redshift.phot float nullable S20cm ? 20cm flux density (5) mJy phot.flux.density;em.radio.750-1500MHz double nullable logX ? Log RASS full-band count rate (6) log(count.s**-1) phot.count;em.X-ray float nullable pm ? Proper motion (7) mas/yr pos.pm float nullable