J/ApJ/751/6ivo://CDS.VizieR/J/ApJ/751/6doi:10.26093/cds/vizier.17510006CDSDa Costa G.S.2017-07-03T14:25:42Z2014-01-29T09:29:08ZCDS support team

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

cds-question@unistra.frglobular-star-clustersradial-velocityline-intensitiesinfrared-photometryvisible-astronomyphotometryThe multi-object fiber-fed spectrograph AAOmega at the Anglo-Australian Telescope has been used to establish and measure accurate (<=1km/s) radial velocities for a new sample of members in the outer parts of the stellar system {omega} Centauri. The new sample more than doubles the number of known members with precise velocities that lie between 25' and 45' from the cluster center. Combining this sample with earlier work confirms that the line-of-sight velocity dispersion of {omega} Cen remains approximately constant at ~6.5km/s in the outer parts of the cluster, which contain only a small fraction of the total cluster stellar mass. It is argued that the approximately constant velocity dispersion in the outer regions is most likely a consequence of external influences, such as the tidal shock heating that occurs each time {omega} Cen crosses the Galactic plane. There is therefore no requirement to invoke dark matter or non-standard gravitational theories.2012ApJ...751....6Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/731/64 : Spectroscopy of 300 RGBs in {omega} Cen (Marino+, 2011)J/MNRAS/396/2183 : RVs of red giants in {omega} Cen (Sollima+ 2009)J/MNRAS/399/195 : Blue & red spectra of {omega} Cen HB stars (Van Loon+, 2009)J/ApJ/698/2048 : Abundances of red giants in {omega} Cen (Johnson+, 2009)J/AJ/136/506 : RVs of {omega} Centauri members (Da Costa+, 2008)J/ApJ/681/1505 : Abundances of red giants in {omega} Cen (Johnson+, 2008)J/ApJ/661/L155 : Radial velocities RGB stars in omega Cen (Pancino+, 2007)J/A+A/445/503 : Radial velocities in Omega Cen (NGC5139) (Reijns+, 2006)J/ApJ/647/1075 : Age-metallicity relation of {omega} Cen (Stanford+, 2006)J/AJ/114/1087 : Omega Cen radial velocities (Mayor+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/751/6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/751/6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/751/6https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/751/6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/751/6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/751/6/stars (Velocities measured)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/6/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/6/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/6/stars?GETtext/xml+votable180.050000true201.27725-47.29488890.0055555555555555566/43225 43226 43227 43228 43230 432493.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/751/6?format=asciiOpticalInfrareddefaultJ/ApJ/751/6/starsVelocities measurede_HRV[0.1/3] The 1{sigma} error in HRVkm/sstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMmSimbad column added by the CDSmeta.code.membercharIDCluster star identifier; <[DC2008] NN-N-NNNNN> in Simbadmeta.id;meta.maincharRAJ2000[13] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[46/48] Degree of Declination (J2000)pos.eq.dec;meta.mainHRV[210/255] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatDist[20/59] Distance from cluster centerarcminpos.angDistancefloatVmag[15/17.3] The V band magnitude (1)magphot.mag;em.opt.VfloatV-I[0.8/1.2] The (V-I) color index (1)magphot.color;em.opt.V;em.opt.IfloatEW[1.6/4.4] Sum of 8542 and 8662 Ca II triplet line equivalent widths ({AA})0.1nmspect.line.eqWidthfloate_EW[0.06/0.3] The 1{sigma} error in EW; Angstroms0.1nmstat.error;spect.line.eqWidthfloatDC08Display the DC08 data (Da Costa et al. 2008, Cat. J/AJ/136/506) if anymeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar