J/A+A/482/419ivo://CDS.VizieR/J/A+A/482/419doi:10.26093/cds/vizier.34820419CDSMilvang-Jensen B.Noll S.Halliday C.Poggianti B.M.Jablonka P.,Aragon-Salamanca A.Saglia R.P.Nowak N.von der Linden A.De Lucia G.,Pello R.Moustakas J.Poirier S.Bamford S.P.Clowe D.I.,Dalcanton J.J.Rudnick G.H.Simard L.White S.D.M.Zaritsky D.2022-09-02T12:23:05Z2008-05-17T13:50:01ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedWe present spectroscopic observations of galaxies in 15 survey fields as part of the ESO Distant Cluster Survey (EDisCS). We determine the redshifts and velocity dispersions of the galaxy clusters located in these fields, and we test for possible substructure in the clusters. We obtained multi-object mask spectroscopy using the FORS2 instrument at the VLT. We reduced the data with particular attention to the sky subtraction. We implemented the method of Kelson for performing sky subtraction prior to any rebinning/interpolation of the data. From the measured galaxy redshifts, we determine cluster velocity dispersions using the biweight estimator and test for possible substructure in the clusters using the Dressler-Shectman test. The method of subtracting the sky prior to any rebinning/interpolation of the data delivers photon-noise-limited results, whereas the traditional method of subtracting the sky after the data have been rebinned/interpolated results in substantially larger noise for spectra from tilted slits. Redshifts for individual galaxies are presented and redshifts and velocity dispersions are presented for 21 galaxy clusters. For the 9 clusters with at least 20 spectroscopically confirmed members, we present the statistical significance of the presence of substructure obtained from the Dressler-Shectman test, and substructure is detected in two of the clusters. Together with data from our previous paper, spectroscopy and spectroscopic velocity dispersions are now available for 26 EDisCS clusters with redshifts in the range 0.40-0.96 and velocity dispersions in the range 166-1080km/s.2008A&A...482..419Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/482/419CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/137/117 : Las Campanas Distant Cluster Survey (LCDCS) (Gonzalez+, 2001)J/A+A/427/397 : Redshifts of 5 EDisCS galaxy clusters (Halliday+, 2004)J/A+A/444/365 : ESO Distant Cluster Survey, EDisCS (White+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/482/419https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/482/419http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/482/419https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/482/419https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/482/419http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/482/419GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/482/419/data (Redshift data (main part for 14 fields, and supplementary for 13 fields))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/482/419/data?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/482/419/data?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/482/419/data?GETtext/xml+votable180.050000true154.714875-12.13886110.0055555555555555566/25083 25327 25335 25398 25415 25484 25667 25676 25739 26654 26671 26676 26692 44788 44793https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/482/419?format=asciidefaultJ/A+A/482/419/table5Cluster redshifts and velocity dispersionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster designation (HHMM+DDMMa, J2000)meta.id;meta.maincharzRedshiftsrc.redshiftfloatsigmaCluster dispersion velocitykm/sphys.veloc.dispersionintE_sigmaError on sigma (upper limit)km/sstat.error;stat.maxinte_sigmaError on sigma (lower limit)km/sstat.errorintNm0Number of (unique) cluster members having "secure" redshifts (1)meta.numberintNm01Number of (unique) cluster members having "secure" or "secure but with larger uncertainties" redshifts (1)meta.numberintNm012Number of (unique) cluster members having "secure", "secure but with larger uncertainties" or "not secure" redshifts (1)meta.numberintdataDisplay all galaxies member of this clustermeta.ref.urlcharJ/A+A/482/419/dataRedshift data (main part for 14 fields, and supplementary for 13 fields)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Fieldmeta.notecharFieldField designationmeta.id.parentcharIDEDisCS name, EDCSNJHHMMSSs-DDMMSSs (1)meta.id;meta.maincharm_ID[AB] Multiplicity index on IDmeta.code.multipcharRAJ2000Right Ascension J2000, Epoch 2001pos.eq.ra;meta.mainDEJ2000Declination J2000, Epoch 2001pos.eq.dec;meta.mainImag? I-band Magnitude for aperture radius 1" (2)magphot.mag;em.opt.Ifloatnullablez? Spectroscopic redshift (z=0.0000 corresponds to stars) (3)src.redshiftfloatnullableu_z[: ] Uncertainty flag on z (4)meta.code.error;src.redshiftcharMemMembership flag (5)meta.code.errorcharTar[1-4] Targeting flag (6)meta.codeint