GMBCG galaxy cluster catalog from SDSS DR7 J/ApJS/191/254 ivo://CDS.VizieR/J/ApJS/191/254 doi:10.26093/cds/vizier.21910254 CDS Hao J. McKay T.A. Koester B.P. Rykoff E.S. Rozo E. Annis J.,Wechsler R.H. Evrard A. Siegel S.R. Becker M. Busha M. Gerdes D.,Johnston D.E. Sheldon E. 2013-11-09T07:53:50Z 2013-10-24T09:09:31Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr galaxy-clusters galaxies catalogs visible-astronomy sloan-photometry We present a large catalog of optically selected galaxy clusters from the application of a new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data. The algorithm detects clusters by identifying the red-sequence plus brightest cluster galaxy (BCG) feature, which is unique for galaxy clusters and does not exist among field galaxies. Red-sequence clustering in color space is detected using an Error Corrected Gaussian Mixture Model. We run GMBCG on 8240 deg^2^ of photometric data from SDSS DR7 to assemble the largest ever optical galaxy cluster catalog, consisting of over 55,000 rich clusters across the redshift range from 0.1<z<0.55. We present Monte Carlo tests of completeness and purity and perform cross-matching with X-ray clusters and with the maxBCG sample at low redshift. These tests indicate high completeness and purity across the full redshift range for clusters with 15 or more members. 2010ApJS..191..254H https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/191/254 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) http://home.fnal.gov/~jghao/gmbcg_sdss_catalog.html : GMBCG Home Page http://www.sdss.org : SDSS Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/191/254 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/191/254 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/191/254 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/191/254 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/191/254 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/191/254 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/191/254/gmbcgdr7 (Catalog of BCGs in rich clusters of galaxies from GMBCG (Gaussian Mixture Brightest Cluster Galaxy)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/191/254/gmbcgdr7? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/191/254/gmbcgdr7? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/191/254/gmbcgdr7? 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49087 49097 49098 49099 49104 49105 49107 49112 49124 49126 49149 49150 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/191/254?format=ascii Optical default J/ApJS/191/254/gmbcgdr7 Catalog of BCGs in rich clusters of galaxies from GMBCG (Gaussian Mixture Brightest Cluster Galaxy) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Sloan Display the SDSS data for this quasar meta.ref.url char objid Unique ID of each galaxy in SDSS DR7 meta.id RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed zph Photometric redshift from DR7 photo-z table src.redshift float e_zph Error of zph stat.error float zsp Spectroscopic redshift src.redshift double g-r SDSS g-r colour index (1) mag phot.color;em.opt.B;em.opt.R float e_g-r Error of g-r mag stat.error;phot.color;em.opt.B float r-i SDSS r-i colour index (1) mag phot.color;em.opt.R;em.opt.I float e_r-i Error of r-i mag stat.error;phot.color;em.opt.R float umag Dust extinction corrected model u magnitude (2) mag phot.mag;em.opt.U float e_umag Error on umag mag stat.error;phot.mag;em.opt.U float gmag Dust extinction corrected model g magnitude (2) mag phot.mag;em.opt.B float e_gmag Error on gmag mag stat.error;phot.mag;em.opt.B float rmag Dust extinction corrected model r magnitude (2) mag phot.mag;em.opt.R float e_rmag Error on rmag mag stat.error;phot.mag;em.opt.R float imag Dust extinction corrected model i magnitude (2) mag phot.mag;em.opt.I float e_imag Error on imag mag stat.error;phot.mag;em.opt.I float zmag Dust extinction corrected model z magnitude (2) mag phot.mag;em.opt.I float e_zmag Error on zmag mag stat.error;phot.mag;em.opt.I float Scl [5/67] Clustering strength (3) stat.param float Ng [8/143] Number of member galaxies inside GM_SCALED_R from BCG (GM_SCALED_NGALS) meta.number int Ng.W [0/134] Weighted richness (GM_NGALS_WEIGHTED) src.class.richness float q_Ng.W [0/1] If it is set to 1, we recommend the use of Ng.W for this cluster meta.code.qual int GMBCG GMBCG designation, JDDD.ddddd+DD.ddddd meta.id;meta.main char DR7 Galaxies within 2' from the SDSS meta.ref.url char