J/ApJS/167/1ivo://CDS.VizieR/J/ApJS/167/1doi:10.26093/cds/vizier.21670001CDSBerlind A.A.Frieman J.Weinberg D.H.Blanton M.R.Warren M.S.,Abazajian K.Scranton R.Hogg D.W.Scoccimarro R.Bahcall N.A.,Brinkmann J.Gott J.R.IIIKleinman S.J.Krzesinski J.Lee B.C.,Miller C.J.Nitta A.Schneider D.P.Tucker D.L.Zehavi I.,(the SDSS Collaboration)2009-06-01T17:05:08Z2009-06-01T16:57:00ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedgalaxy-kinematicsWe identify galaxy groups and clusters in volume-limited samples of the Sloan Digital Sky Survey (SDSS) redshift survey, using a redshift-space friends-of-friends algorithm. We optimize the friends-of-friends linking lengths to recover galaxy systems that occupy the same dark matter halos, using a set of mock catalogs created by populating halos of N-body simulations with galaxies. Extensive tests with these mock catalogs show that no combination of perpendicular and line-of-sight linking lengths is able to yield groups and clusters that simultaneously recover the true halo multiplicity function, projected size distribution, and velocity dispersion. We adopt a linking length combination that yields, for galaxy groups with 10 or more members: a group multiplicity function that is unbiased with respect to the true halo multiplicity function; an unbiased median relation between the multiplicities of groups and their associated halos; a spurious group fraction of less than ~1%; a halo completeness of more than 97%; the correct projected size distribution as a function of multiplicity; and a velocity dispersion distribution that is ~20% too low at all multiplicities. These results hold over a range of mock catalogs that use different input recipes of populating halos with galaxies. We apply our group-finding algorithm to the SDSS data and obtain three group and cluster catalogs for three volume-limited samples that cover 3495.1deg^2^ on the sky, go out to redshifts of 0.1, 0.068, and 0.045, and contain 57138, 37820, and 18895 galaxies, respectively. We correct for incompleteness caused by fiber collisions and survey edges and obtain measurements of the group multiplicity function, with errors calculated from realistic mock catalogs. These multiplicity function measurements provide a key constraint on the relation between galaxy populations and dark matter halos.2006ApJS..167....1Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/167/1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/312/745 : SSRS groups of galaxies redshift neighbourhood (Ramella+, 1996)J/AN/321/101 : Compact groups of galaxies in LCRS (Allam+, 2000)J/A+A/381/420 : Group of Galaxies in the SSRS2 catalog (Adami+, 2002)J/AJ/123/2976 : The UZC-SSRS2 group catalog (Ramella+, 2002)J/ApJ/625/6 : Galaxy groups in the DEEP2 Galaxy Redshift Survey (Gerke+ 2005)J/A+A/479/927 : Group of galaxies in SDSS 5 (Tago+, 2008)J/AN/327/365 : Clusters and groups of galaxies in 2dF (Tago+, 2006)J/A+A/474/783 : Main galaxy groups from SDSS-DR5 (Deng+, 2007)II/259 : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005)http://sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/167/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/167/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/167/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/167/1https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/167/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/167/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/167/1/table3 (Group and Cluster Catalogs for Samples Mr20, Mr19, and Mr18)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/167/1/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/167/1/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/167/1/table3?GETtext/xml+votable180.050000true239.5807427.312343060.005555555555555556Cone search capability for table J/ApJS/167/1/table4 (Member Galaxies of Groups and Clusters for Samples Mr20, Mr19, and Mr18)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/167/1/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/167/1/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/167/1/table4?GETtext/xml+votable180.050000true196.76989389-0.039161110.0055555555555555564/313 316 373 402 451 621 687 1599 1637 1694 5/136 1024 1028 1030 1038 1039 1040 1041 1042 1045 1198 1199 1207 1210 1212 1213 1214 1246 1247 1251 1256 1259 1260 1263 1269 1271 1272 1273 1275 1399 1405 1407 1416 1423 1424 1431 1434 1439 1443 1445 1446 1456 1463 1466 1471 1478 1479 1480 1482 1483 1489 1491 1497 1499 1506 1507 1508 1510 1514 1517 1518 1520 1521 1522 1535 1540 1549 1553 1555 1559 1560 1561 1566 1567 1603 1605 1606 1607 1613 1616 1619 1624 1632 1633 1635 1636 1637 1639 1640 1641 1644 1645 1649 1650 1651 1653 1654 1655 1797 1799 1809 1810 1816 1817 1824 1826 1827 1828 1829 1830 1840 1842 1860 1861 1878 2051 2052 2271 2302 2316 2325 2327 2332 2333 2334 2338 2342 2348 2356 2359 2361 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45043 45045 45046 45047 45048 45050 45051 45054 49005 49007 49012 49014 49016 49017 49018 49020 49022 49091 49092 49095 49097 49100 49103 49104 49106 49112 49121 49122 49128 49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/167/1?format=asciiOpticaldefaultJ/ApJS/167/1/table3Group and Cluster Catalogs for Samples Mr20, Mr19, and Mr18RichGroup richnesssrc.class.richnessintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampThe volume-limited sample (G1)src.samplecharGroupGroup identification number \linkRole{galaxies of this group } (1)meta.id;meta.mainintprimaryRAJ2000Right Ascension (J2000) of group centroiddegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of group centroiddegpos.eq.dec;meta.mainzMean redshift of the groupsrc.redshiftdoublerMAGTotal group r band absolute magnitudemagphys.magAbsfloatg-rTotal group (g-r) color indexmagphot.color;em.opt.B;em.opt.RfloatsigmaGroup velocity dispersionkm/sphys.veloc.dispersionfloatRPerpGroup projected rms radius (in h^-1^Mpc)Mpcstat.stdev;phys.size.radius;pos.lgfloatRedgePerpendicular distance of group center from survey edge (in h^-1^Mpc)Mpcpos.distancefloatJ/ApJS/167/1/table4Member Galaxies of Groups and Clusters for Samples Mr20, Mr19, and Mr18recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampThe R band sample (G1)src.samplecharGroupGroup identification number (1)meta.id.parentintRAJ2000Galaxy Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Galaxy Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedzGalaxy redshift (2)src.redshiftdoublerMAGGalaxy r band absolute magnitudemagphys.magAbsfloatg-rGalaxy (g-r) color indexmagphot.color;em.opt.B;em.opt.Rfloatf_z[0/1] Fiber collision flag (3)meta.codeintRedgePerpendicular distance of galaxy from the survey edge (in h^-1^ Mpc)Mpcpos.distancefloatSDSSDisplay the SDSS datameta.ref.urlchar