J/AJ/112/36ivo://CDS.VizieR/J/AJ/112/36doi:10.26093/cds/vizier.51120036CDSQuintana H.Ramirez A.Way M.J.2023-04-06T16:50:23Z1998-08-31T12:19:32ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradial-velocityWe present 387 velocities covering an area 1.8x1.8{deg}^2^, including 229 new galaxy velocities obtained from 309 spectra, of which 317 appear to be cluster members according to our analysis. Based on this extended velocity sample we reanalyzed the velocity structure of the cluster. We found a strongly decreasing velocity dispersion profile that, as well as the mean velocity, shows significant radial scatter. Inside the 2.5h_50_^-1^Mpc radius, the velocity dispersion has a value of 1306+/-73km/s, while further out than 3h_50_^-1^Mpc it falls below 800km/s. The global dispersion is 1085+/-51km/s. We found a remarkable velocity substructure, which we interpret as a tidal outgoing arm reaching from the center to the northernmost extensions surveyed. The arm could be produced by a recent merger with another cluster, that moved from the front and SW direction and scattered from the main cluster core into the arm. This model allows us to derive an epoch for the collision between the more massive core and the front edge of the incoming cluster of 4x10^9^h_50_^-1^yr ago and of ~2x10^9^h_50_^-1^yr for the merging of both cores. Formation of the dumb-bell is a later merger process of the two BCMs, consistent with theoretical estimates. The collision picture is also consistent with the distorted X-ray image. The very northernmost parts of the arm could, alternatively, be interpreted as ongoing infall of a few outlying loose groups. The suggestion of a faint galaxy system within 400h_50_^-1^kpc, satellite to the central dumb-bell, is maintained in spite of the large central velocity dispersion value; however, confirmation requires data for further compact faint members. From several mass estimators we derived a cluster dynamical mass value of 5x10^15^h_50_^-1^M_{sun}_, but this value should be seen in the merger context described.1996AJ....112...36Qhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/112/36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/112/36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/112/36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/112/36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/112/36https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/112/36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/112/36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/112/36/table1 (A3266 - Velocities.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/112/36/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/112/36/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/112/36/table1?GETtext/xml+votable180.050000true65.990269-60.6816130.005555555555555556Cone search capability for table J/AJ/112/36/a3266 (Cluster members (Figures 8-9 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/112/36/a3266?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/112/36/a3266?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/112/36/a3266?GETtext/xml+votable180.050000true67.831343-61.4050780.0055555555555555565/8308 6/33223 33229 33236 33238 33240-33241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/112/36?format=asciiOpticaldefaultJ/AJ/112/36/table1A3266 - Velocities.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdIdentification numbermeta.id;meta.mainintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainVelVelocitykm/sphys.veloc;pos.heliocentricinte_Velrms uncertainty on Velkm/sstat.errorintTDR? R Tonry and Davis (1979AJ.....84.1511T) valuestat.correlationfloatnullableNote[*e] emission/uncertainty (1)meta.notecharRefReferences (2)meta.refcharIdRefFiber or galaxy number in the references (3)meta.notecharVelAdop? Adopted final velocitykm/sphys.veloc;phys.atmol.finalintnullablee_VelAdop? rms uncertainty on VelAdopkm/sstat.errorintnullable_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/AJ/112/36/a3266Cluster members (Figures 8-9 of paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNoGalaxy Numbermeta.id;meta.mainintIdIdentification numbermeta.idintRA1950Right Ascension 1950pos.eq.ra;meta.mainDE1950Declination 1950pos.eq.dec;meta.mainXDistance from cluster center, East leftMpcpos.distancefloatYDistance from cluster center, NorthMpcpos.distancefloatRDistance from cluster center (1)Mpcpos.distancefloatVelFinal velocitykm/sphys.veloc;pos.heliocentricinte_VelMean error on Velkm/sstat.errorint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed