J/A+A/435/781ivo://CDS.VizieR/J/A+A/435/781doi:10.26093/cds/vizier.34350781CDSOlsen L.F.Benoist C.da Costa L.Hansen L.Joergensen H.E.2007-06-12T13:19:30Z2007-06-12T13:17:14ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxiesphotometryredshiftedgalaxy-kinematicsWe have carried out an investigation of the properties of low redshift EIS clusters using both spectroscopy and imaging data. We present new redshifts for 738 galaxies in 21 ESO Imaging Survey (EIS) Cluster fields. We use the "gap"-technique to search for significant overdensities in redshift space and to identify groups/clusters of galaxies corresponding to the original EIS matched filter cluster candidates. In this way we spectroscopically confirm 20 of the 21 cluster candidates with a matched-filter estimated redshift z_MF_=0.2. We have now obtained spectroscopic redshifts for 34 EIS cluster candidates with z_MF_=0.2 (see also Hansen et al., 2002, Cat. <J/A+A/388/1>; Olsen et al., 2003, Cat. <J/A+A/409/439>. Of those we spectroscopically confirm 32 with redshifts ranging from z=0.064 to 0.283. We find that: 1) the velocity dispersions of the systems range from sigma_v_<=130km/s to sigma_v_=1200km/s, typical of galaxy groups to rich clusters; 2) richnesses corresponding to Abell classes R<=1; and 3) concentration indices ranging from C=0.2 to C=1.2. From the analysis of the colours of the galaxy populations we find that 53% of the spectroscopically confirmed systems have a "significant" red sequence. These systems are on average richer and have higher velocity dispersions. We find that the colour of the red sequence galaxies matches passive stellar evolution predictions.2005A&A...435..781Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/435/781CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/388/1 : Redshifts of five EIS clusters (Hansen+, 2002)J/A+A/409/439 : Redshifts of 11 EIS clusters (Olsen+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/435/781https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/435/781http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/435/781https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/435/781https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/435/781http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/435/781GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/435/781/table3 (List of galaxy redshifts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/435/781/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/435/781/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/435/781/table3?GETtext/xml+votable180.050000true146.53110833-21.555408330.005555555555555556Cone search capability for table J/A+A/435/781/table5 (Properties of the confirmed EIS clusters and groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/435/781/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/435/781/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/435/781/table5?GETtext/xml+votable180.050000true11.25-29.38330.0055555555555555565/10072 6/16640 35755 40245-40247 40252-40253 40255 40266 40296 46509 46511 46852https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/435/781?format=asciiOpticaldefaultJ/A+A/435/781/table3List of galaxy redshiftszMeasured redshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential identification number for this tablemeta.id;meta.mainintRAJ2000Right ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainImagEIS I magnitudemagphot.mag;em.opt.IfloatNotes[e:] e=emission line(s) (1)meta.notecharClusterclosest cluster from table5meta.ref.urlcharJ/A+A/435/781/table5Properties of the confirmed EIS clusters and groupsCIConcentration indexphys.size;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential identification number for this tablemeta.id;meta.mainintNameEIS cluster name (JHHMM+DDMM)meta.idcharMembNumber of member galaxiesmeta.numberintzMean redshiftsrc.redshiftfloatsigmaVelocity dispersionkm/sphys.veloc.dispersionintE_sigmaUpper error of sigmakm/sstat.error;stat.maxinte_sigmaLower error of sigmakm/sstat.errorintRichLambda-richnessmeta.notefloatV-Ip? V-I from photometric analysismagphot.color;em.opt.V;em.opt.Ifloatnullablen_V-Ip[ab] Note when no data (1)meta.notecharsgp? Significance of detected photometric sequence%stat.fit.goodnessfloatnullablen_sgp[ab] Note when no data (1)meta.notecharV-Is? V-I from spectroscopic analysismagphot.color;em.opt.V;em.opt.Ifloatnullablen_V-Is[ab] Note when no data (1)meta.notecharsgs? Significance of spectroscopic sequence%stat.fit.goodnessfloatnullablen_sgs[ab] Note when no data (1)meta.notecharScatter? Scatter of spectroscopic sequencemagstat.fit.paramfloatnullablen_Scatter[ab] Note when no data (1)meta.notecharGalaxiesclosest galaxies from table3meta.ref.urlchar_RAPosition (derived from Name) (right ascension part)degpos.eq.ra;meta.main_DEPosition (derived from Name) (declination part)degpos.eq.dec;meta.main