J/MNRAS/499/89ivo://CDS.VizieR/J/MNRAS/499/89doi:10.26093/cds/vizier.74990089CDSWang K.Mo H.J.Li C.Meng J.Chen Y.2024-08-21T20:16:38Z2023-11-07T07:42:19ZCDS support team

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

cds-question@unistra.frgalaxy-groupsredshiftedgalaxiescatalogsvisible-astronomyIdentifying galaxy groups from redshift surveys of galaxies plays an important role in connecting galaxies with the underlying dark matter distribution. Current and future high-z spectroscopic surveys, usually incomplete in redshift sampling, present both opportunities and challenges to identifying groups in the high-z Universe. We develop a group finder that is based on incomplete redshift samples combined with photometric data, using a machine learning method to assign halo masses to identified groups. Test using realistic mock catalogues shows that >~90 per cent of true groups with halo masses M_h_>~_10^12^M_{sun}_h^-1^ are successfully identified, and that the fraction of contaminants is smaller than 10 per cent. The standard deviation in the halo mass estimation is smaller than 0.25dex at all masses. We apply our group finder to zCOSMOS-bright and describe basic properties of the group catalogue obtained.2020MNRAS.499...89Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/499/89CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)J/ApJS/172/70 : zCOSMOS-bright catalog, DR3 (Lilly+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/499/89https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/499/89http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/499/89https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/499/89https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/499/89http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/499/89GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/499/89/galaxies (The galaxy catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/499/89/galaxies?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/499/89/galaxies?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/499/89/galaxies?GETtext/xml+votable180.050000true149.653842.70290.005555555555555556Cone search capability for table J/MNRAS/499/89/groups (The group catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/499/89/groups?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/499/89/groups?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/499/89/groups?GETtext/xml+votable180.050000true149.653842.70290.0055555555555555565/6814 6/27245 27247https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/499/89?format=asciiOpticaldefaultJ/MNRAS/499/89/galaxiesThe galaxy cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[0/30327] Galaxy internal identifiermeta.id;meta.mainintSIDGalaxy identifier from the original survey data releasemeta.idintL16IDGalaxy identifier in Laigle et al. (2016ApJS..224...24L, Cat. J/ApJS/224/24)meta.idintGroup? Group internal identifier (1)meta.idintnullableRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedzRedshift (2)src.redshiftdoublelogMassLogarithm of the galaxy's stellar masslog(solMass)phys.massdoubletagGalaxy tag (3)meta.codecharCCRedshift confidence flag (4)meta.codefloatJ/MNRAS/499/89/groupsThe group cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup? Group internal identifiermeta.id;meta.mainintnullableIDInternal identifier of the central galaxy of the groupmeta.id.associntL16IDCentral galaxy identifier in Laigle et al. (2016ApJS..224...24L, Cat. J/ApJS/224/24)meta.id.associntRAJ2000Right ascension (J2000) of the group centre (1)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000) of the group centre (1)degpos.eq.dec;meta.mainindexedzRedshift of the group (2)src.redshiftdoublelogMhaloLogarithm of the halo mass of the grouplog(solMass)phys.massdoubletag[0/2] Group tag (3)meta.codecharRichnessNumber of member galaxies in a groupmeta.numberint