J/ApJ/518/69ivo://CDS.VizieR/J/ApJ/518/69doi:10.26093/cds/vizier.15180069CDSMahdavi A.Geller M.J.Bohringer H.Kurtz M.J.Ramella M.2018-01-30T07:18:08Z2010-11-26T22:22:38ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedWe assemble and observe a sample of poor galaxy systems that is suitable for testing N-body simulations of hierarchical clustering and other dynamical halo models. We (1) determine the parameters of the density profile {Rho}(r) and the velocity dispersion profile {sigma}_p_(R), (2) separate emission-line galaxies from absorption-line galaxies, examining the model parameters, {beta}, and as a function of spectroscopic type, and (3) for the best-behaved subsample, constrain the velocity anisotropy parameter, {beta}, which determines the shapes of the galaxy orbits. Our sample consists of 20 systems, 12 of which have extended X-ray emission in the ROSAT All-Sky Survey. We measure the 877 optical spectra of galaxies brighter than m_R_~15.4 within 1.5h^-1^Mpc of the system centers (we take H_0_=100h*km/s/Mpc). Thus, we sample the system membership to a radius typically three times larger than other recent optical group surveys. The average system population is 30 galaxies, and the average line-of-sight velocity dispersion is ~300km/s. The Navarro, Frenk, & White universal profile and the Hernquist model both provide good descriptions of the spatial data. In most cases an isothermal sphere is ruled out. Systems with declining {sigma}_p_(R) are well-matched by theoretical profiles in which the star-forming galaxies have predominantly radial orbits ({beta}>0); many of these galaxies are probably falling in for the first time. There is significant evidence for spatial segregation of the spectroscopic classes regardless of {sigma}_p_(R).1999ApJ...518...69Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/518/69CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/193 : The CfA Redshift Catalogue, Version June 1995 (Huchra+ 1995)J/AJ/116/1 : Southern Sky Redshift Survey (SSRS2) (Da Costa+, 1998)J/ApJ/534/114 : RASSCALS: X-ray and optical study (Mahdavi+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/518/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/518/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/518/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/518/69https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/518/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/518/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/518/69/table1 (The Deep Optical Catalog: basic data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/518/69/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/518/69/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/518/69/table1?GETtext/xml+votable180.050000true4.5937530.0666670.005555555555555556Cone search capability for table J/ApJ/518/69/table2 (Galaxy positions and measured velocities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/518/69/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/518/69/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/518/69/table2?GETtext/xml+votable180.050000true2.987529.4855560.0055555555555555565/1238 1247 1275 1416 1417 2104 2360 4560 5081 6649 6/4735 4821 4823 4906 4907 4956 4961 4963 4964 4966 4967 4972 4982 4985 4986 4987 4992 4993 4995 5076 5095 5097 5099 5201 5204 5205 5383 5389 5394 5400 5642 5647 5658 5659 5672 5677 5680 5682 8373 8425 9446 9448 9449 10439 10444 10445 10447 10450 10456 13377 13380 13381 17896 17898 17899 17902 17903 18244 18245 18246 19383 19426 19427 19432 19433 19434 20201 20202 20203 20204 20206 20207 20302 20303 20321 20323 20333 20338 26561 26562 26563 26564 26566 26568 26569 26571 26572 26574 26593 26595 28411 28412 28414 28523 28526 28527 28575 28597 28598 28599 28609 28612 28640 28642https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/518/69?format=asciiOpticaldefaultJ/ApJ/518/69/table1The Deep Optical Catalog: basic dataComComments (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDOCGroup identification (Deep Optical Catalog) (<DOC SRGaNNN>, <DOC NRGaNNN> in Simbad)meta.id;meta.maincharprimaryn_DOC[abcde ] Individual Notes (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNCSOCNumber of galaxies classified as members in the CSOC (combined CfA-SSRS2 redshifts surveys, Ramella et al., 1999, in prep.)meta.numberintNtotTotal number of galaxies to m_R_~15.4 in the field of the systemmeta.id;obs.fieldintNdocTotal number of galaxies classified as members in this work.meta.numberint<v>Recession velocity of the systemkm/sphys.veloc;pos.frameintE_<v>Error in <v> (upper limit)km/sstat.error;stat.maxinte_<v>Error in <v> (lower limit)km/sstat.errorintsigmapDispersion velocitykm/sphys.veloc.dispersionintE_sigmapError in sigmap (upper limit)km/sstat.error;stat.maxinte_sigmapError in sigmap (lower limit)km/sstat.errorintl_PpointLimit flag on Ppointmeta.code.errorcharPpoint? Probability that the X-ray emission in the field is due to a single point source.%statfloatnullablePpoint2? Probability for NRGs156. See note (3)%statfloatnullableJ/ApJ/518/69/table2Galaxy positions and measured velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDOCGroup identification (SNGaNNN or NRGaNNN)meta.id.parentcharm_DOCGalaxy number in the Group (.NN) (<DOC SRGaNNN.NN>, <DOC NRGaNNN.NN> in simbad)meta.code.multipcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainczVelocity (typical uncertainty = 40km/s)km/sstat.error;phys.velocint