J/ApJ/751/50ivo://CDS.VizieR/J/ApJ/751/50doi:10.26093/cds/vizier.17510050CDSGerke B.F.Newman J.A.Davis M.Coil A.L.Cooper M.C.Dutton A.A.,Faber S.M.Guhathakurta P.Konidaris N.Koo D.C.Lin L.Noeske K.,Phillips A.C.Rosario D.J.Weiner B.J.Willmer C.N.A.Yan R.2017-12-18T07:56:55Z2014-02-03T11:51:22ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxy-kinematicsredshiftedWe present a public catalog of galaxy groups constructed from the spectroscopic sample of galaxies in the fourth data release from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) Galaxy Redshift Survey, including the Extended Groth Strip (EGS). The catalog contains 1165 groups with two or more members in the EGS over the redshift range 0<z<1.5 and 1295 groups at z>0.6 in the rest of DEEP2. 25% of EGS galaxies and 14% of high-z DEEP2 galaxies are assigned to galaxy groups. The groups were detected using the Voronoi-Delaunay method (VDM) after it has been optimized on mock DEEP2 catalogs following similar methods to those employed in Gerke et al (2005, J/ApJ/625/6). In the optimization effort, we have taken particular care to ensure that the mock catalogs resemble the data as closely as possible, and we have fine-tuned our methods separately on mocks constructed for the EGS and the rest of DEEP2. We have also probed the effect of the assumed cosmology on our inferred group-finding efficiency by performing our optimization on three different mock catalogs with different background cosmologies, finding large differences in the group-finding success we can achieve for these different mocks. Using the mock catalog whose background cosmology is most consistent with current data, we estimate that the DEEP2 group catalog is 72% complete and 61% pure (74% and 67% for the EGS) and that the group finder correctly classifies 70% of galaxies that truly belong to groups, with an additional 46% of interloper galaxies contaminating the catalog (66% and 43% for the EGS). We also confirm that the VDM catalog reconstructs the abundance of galaxy groups with velocity dispersions above ~300 km/s to an accuracy better than the sample variance, and this successful reconstruction is not strongly dependent on cosmology.2012ApJ...751...50Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/301 : The DEEP2-DR1 Photometric Catalog (Coil+ 2004)III/268 : DEEP2 Redshift Survey, Data Release 4 (Matthews+ 2013)VII/86 : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982)J/A+A/520/A42 : Galaxy groups in the VIMOS-VLT Deep Survey (Cucciati+, 2010)J/ApJ/654/115 : DEEP2 Galaxy Redshift Survey: SDSS QSOs (Coil+, 2007)J/MNRAS/377/806 : Tully-Fisher relation of DEEP2 galaxies (Chiu+, 2007)J/ApJ/625/6 : Galaxy groups in the DEEP2 GRS (Gerke+, 2005)J/ApJS/157/175 : DEEP Groth Strip Survey. VIII. (Koo+, 2005)J/MNRAS/348/866 : 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) (Eke+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/751/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/751/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/751/50https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/751/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/751/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/751/50/table3 (The DEEP2 Voronoi-Delaunay method (VDM) group catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/50/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/50/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/50/table3?GETtext/xml+votable180.050000true37.84329170.58877780.005555555555555556Cone search capability for table J/ApJ/751/50/table4 (Galaxies in the DEEP2 VDM group catalog and the ID numbers of their host groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/50/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/50/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/50/table4?GETtext/xml+votable180.050000true37.842983060.592328890.0055555555555555565/4697 6/9342 9343 9428 9429 11424 11425 11426 11428 17766 17767 17772 17773 18787 18793 18796https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/751/50?format=asciiOpticaldefaultJ/ApJ/751/50/table3The DEEP2 Voronoi-Delaunay method (VDM) group catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/2500] Unique identification group number (<[GND2012] NNNN> in Simbad)meta.id;meta.mainintprimaryRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainz[0.04/1.5] Redshift of the group (1)src.redshiftfloatNg[2/21] Number of galaxies within the groupmeta.numberintsigV[0/960] Velocity dispersion {sigma}_V_km/sphys.veloc.dispersionintHP[Yes/No ] High-Purity? (2)meta.codecharG05Cross-match with Gerke et al., 2005, Cat. J/ApJ/625/6, within 60"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/751/50/table4Galaxies in the DEEP2 VDM group catalog and the ID numbers of their host groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjNoUnique DEEP2 catalog galaxy identification (<DEEP2-GRS NNNNNNNN> in Simbad)meta.id;meta.mainintID[1/2500] Unique identification group number as in Table 3meta.id.parentintSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions of galaxies from DEEP2-DR1 photometric catalog II/301 (right ascension part)degpos.eq.ra;meta.main_DEPositions of galaxies from DEEP2-DR1 photometric catalog II/301 (declination part)degpos.eq.dec;meta.main