J/A+A/421/59ivo://CDS.VizieR/J/A+A/421/59doi:10.26093/cds/vizier.34210059CDSGerken B.Ziegler B.L.Balogh M.L.Gilbank D.G.Fritz A.Jaeger K.2004-10-11T20:22:37Z2004-10-11T20:22:29ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyline-intensitiesredshiftedWe present a spectroscopic analysis of two galaxy clusters out to ~4Mpc at z~0.2. The two clusters VMF73 and VMF74 identified by Vikhlinin et al. (1998, Cat. <J/ApJ/502/558>) were observed with MOSCA at the Calar Alto 3.5m telescope. Both clusters lie in the ROSAT PSPC field R285 and were selected from the X-ray Dark Cluster Survey (Gilbank et al., 2004MNRAS.348..551G) that provides optical V- and I-band data. VMF73 and VMF74 are located at respective redshifts of z=0.25 and z=0.18 with velocity dispersions of 671km/s and 442km/s, respectively. The spectroscopic observations reach out to ~2.5 virial radii. Line strength measurements of the emission lines H_alpha and [OII]3727 are used to assess the star formation activity of cluster galaxies which show radial and density dependences. The mean and median of both line strength distributions as well as the fraction of star forming galaxies increase with increasing clustercentric distance and decreasing local galaxy density. Except for two galaxies with strong H_alpha and [OII] emission, all of the cluster galaxies are normal star forming or passive galaxies. Our results are consistent with other studies that show the truncation in star formation occurs far from the cluster centre.2004A&A...421...59Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/421/59CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/502/558 : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/421/59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/421/59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/421/59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/421/59https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/421/59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/421/59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/421/59/tablea1 (J2000 coordinates, redshifts and H{alpha} and [OII]3727 equivalent widths of 79 galaxies in VMF73 and VMF74)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/421/59/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/421/59/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/421/59/tablea1?GETtext/xml+votable180.050000true146.0133958316.663497220.0055555555555555566/4403 4409https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/421/59?format=asciiOpticaldefaultJ/A+A/421/59/tablea1J2000 coordinates, redshifts and H{alpha} and [OII]3727 equivalent widths of 79 galaxies in VMF73 and VMF74recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDGalaxy spectrum ID numbermeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzSpectroscopic redshiftsrc.redshiftfloatEWHa? H{alpha} equivalent width (1)0.1nmspect.line.eqWidthdoublenullablee_EWHa? Error of H{alpha} equivalent width0.1nmstat.errorfloatnullableEWOIIEquivalent width of [OII]37270.1nmspect.line.eqWidthfloate_EWOIIError of [OII]3727 equivalent width0.1nmstat.errorfloatClCorresponding galaxy cluster (VMF73 or VMF74) (2)meta.id.parentchar