J/AJ/127/1811ivo://CDS.VizieR/J/AJ/127/1811doi:10.26093/cds/vizier.51271811CDSLee B.C.Allam S.S.Tucker D.L.Annis J.Johnston D.E.Scranton R.,Acebo Y.Bahcall N.A.Bartelmann M.Bohringer H.Ellman N.,Grebel E.K.Infante L.Loveday J.Mckay T.A.Prada F.Schneider D.P.,Stoughton C.Szalay A.S.Vogeley M.S.Voges W.Yanny B.2023-04-06T16:51:02Z2005-11-08T12:54:34ZCDS support team

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

cds-question@unistra.frsurveysgalaxiescatalogsvisible-astronomysloan-photometryCompact groups (CGs) of galaxies - relatively poor groups of galaxies in which the typical separations between members is of the order of a galaxy diameter - offer an exceptional laboratory for the study of dense galactic environments with short (<1Gyr) dynamical timescales. We present an objectively defined catalog of CGs in 153deg^2^ of the Sloan Digital Sky Survey (SDSS) Early Data Release (<J/AJ/123/567>). To identify CGs, we applied a modified version of Hickson's criteria of 1982 aimed at finding the highest-density CGs and thus reducing the number of chance alignments. Our catalog contains 175 CGs down to a limiting galaxy magnitude of r*=21. The resulting catalog has a median depth of z_med_~0.13, substantially deeper than previous CG catalogs. Since the SDSS will eventually image up to one-quarter of the celestial sphere, we expect our final catalog, based on the completed SDSS, will contain on the order of 5000-10000CGs. This catalog will be useful for conducting studies of the general characteristics of CGs, their environments, and their component galaxies.2004AJ....127.1811Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/127/1811CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/567 : SDSS quasar catalog, I: Early Data Release (Schneider+, 2002)J/AJ/126/2579 : SDSS quasar catalog. II. First data release (Schneider+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/127/1811https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/127/1811http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/127/1811https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/127/1811https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/127/1811http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/127/1811GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/127/1811/table1 (The SDSS Compact Group Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/1811/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/1811/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/1811/table1?GETtext/xml+votable180.050000true145.203-0.8601750.005555555555555556Cone search capability for table J/AJ/127/1811/table2 (The SDSS Compact Group Members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/1811/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/1811/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/1811/table2?GETtext/xml+votable180.050000true145.207375-0.8630750.0055555555555555565/7849 6/25598-25599 25853 25918-25919 25935 25938 25940-25941 25944 25947-25950 25954-25955 25957-25959 25961 25964 25969 25999 26004 26006 26010 26017-26019 26021-26022 26025 26027-26028 26030 26032 26048 26050 26173-26175 26183 26189 26191 26193-26197 26199-26200 26202-26204 26209-26211 26216-26217 26224 26255 26257 26259-26260 26262 26266 26275-26276 26278-26279 26281-26282 26368 26943 26962 26964-26966 26971-26972 26980 26983 26986-26987 27031 27033 27036 27038 27043 27045 27048 27051 27054 27074 27218 27220-27221 27224 27226 27229 27237-27240 27244-27245 27248-27250 27284 27394 27648-27650 31378 31383 31388 31400-31401 31404 31406 314082.85864675833786e-19 3.5010283109654867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/127/1811?format=asciiOpticaldefaultJ/AJ/127/1811/table1The SDSS Compact Group PropertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSCGCompact group identificationcharprimaryRAJ2000Hour of right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (1)pos.eq.dec;meta.mainthetaGAngular diameter of the smallest circlearcsecfloatmuGTotal r* magnitude of the Ntot group members averaged over thetamag.arcsec**-2floatNtotTotal number of galaxies in the group within 3mag of the brightest group memberintDr*magThe r* magnitude difference between brightest and faintest group membersmagfloatN/GRatio of diameters, thetaN/thetaG (2)floatzph? Brightest group member's photometric redshiftfloatnullablezsp? Group spectroscopic redshift (3)floatnullablen_zsp? Number of group members in zspintnullableCommAdditional comments (4)charJ/AJ/127/1811/table2The SDSS Compact Group MembersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSCGName of the group member (1)charGalaxy[a-g] Galaxy identification in the group (1)charRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainr*magSDSS non-dereddened r-band model magnitudemagfloate_r*magEstimated rms error in r*magmagfloatA(r*)Reddening in r*mag (2)magfloatu*-g*SDSS non-dereddened (u*-g*) model colormagfloate_u*-g*Estimated rms error in u*-g* (3)magfloatg*-r*SDSS non-dereddened (g*-r*) model colormagfloate_g*-r*Estimated rms error in g*-r* (3)magfloatr*-i*SDSS non-dereddened (r*-i*) model colormagfloate_r*-i*Estimated rms error in r*-i* (3)magfloati*-z*SDSS non-dereddened (i*-z*) model colormagfloate_i*-z*Estimated rms error in i*-z* (3)magfloatzsp? SDSS spectroscopic redshift (4)doublenullablezNED? NED spectroscopic redshift (5)floatnullableNoteSource name of NED-derived spectroscopic redshiftcharSDSSDisplay the data from SDSS-DR3 (II/259)char