J/MNRAS/419/80ivo://CDS.VizieR/J/MNRAS/419/80doi:10.26093/cds/vizier.74190080CDSAbraham S.Philip N.S.Kembhavi A.Wadadekar Y.G.Sinha R.2024-07-16T20:12:25Z2013-01-24T06:51:09ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysquasarsvisible-astronomysloan-photometryWe present a catalogue of about six million unresolved photometric detections in the Sloan Digital Sky Survey (SDSS) Seventh Data Release, classifying them into stars, galaxies and quasars. We use a machine learning classifier trained on a subset of spectroscopically confirmed objects from 14th to 22nd magnitude in the SDSS i band. Our catalogue consists of 2430625 quasars, 3544036 stars and 63586 unresolved galaxies from 14th to 24th magnitude in the SDSS i-band. Our algorithm recovers 99.96 per cent of spectroscopically confirmed quasars and 99.51 per cent of stars to i~21.3 in the colour window that we study. The level of contamination due to data artefacts for objects beyond i=21.3 is highly uncertain and all mention of completeness and contamination in the paper are valid only for objects brighter than this magnitude. However, a comparison of the predicted number of quasars with the theoretical number counts shows reasonable agreement.2012MNRAS.419...80Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/419/80CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)http://www.sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/419/80https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/419/80http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/419/80https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/419/80https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/419/80http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/419/80GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/419/80/catalog (Photometric catalogue based on 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Should Not be used for identification.meta.recordintObjIDSDSS ObjIDmeta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedumagSDSS u band PSF ubercalibrated asinh magnitude (1)magphot.mag;em.opt.UfloatgmagSDSS g band PSF ubercalibrated asinh magnitude (1)magphot.mag;em.opt.BfloatrmagSDSS r band PSF ubercalibrated asinh magnitude (1)magphot.mag;em.opt.RfloatimagSDSS i band PSF ubercalibrated asinh magnitude (1)magphot.mag;em.opt.IfloatzmagSDSS z band PSF ubercalibrated asinh magnitude (1)magphot.mag;em.opt.IfloatC1Confidence the classifier has in the most probable class%stat.fit.goodnessfloatcl2[1/6] Second most probable class of the object (2)src.class.starGalaxyintC2Confidence the classifier has in the second most probable class%stat.fit.goodnessfloatDR7Details from the SDSS photometric catalogmeta.ref.urlcharSDSSDisplay the SDSS image for this sourcemeta.ref.urlcharcl1[1/6] Most probable class of the object (2)src.class.starGalaxyint