J/A+A/525/A148ivo://CDS.VizieR/J/A+A/525/A148doi:10.26093/cds/vizier.35250148CDSScarpa R.Marconi G.Carraro G.Falomo R.Villanova S.2017-06-28T06:58:11Z2011-06-16T17:06:57ZCDS support team

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

cds-question@unistra.frglobular-star-clustersradial-velocityGlobular clusters are useful for testing the validity of Newtonian dynamics in the low acceleration regime typical of galaxies, without the complications of non-baryonic dark matter. In the absence of disturbing effects, such as tidal heating, the velocity dispersion of globular clusters is expected to vanish at large radii. If this is not observed, and in particular if, as observed in elliptical galaxies, the dispersion is found to be constant at large radii below a certain threshold acceleration, this might indicate a breakdown of Newtonian dynamics. To minimize the effects of tidal heating that can increase the velocity dispersion at large radii, we study the velocity dispersion profile of two distant globular clusters, NGC 1851 and NGC 1904. The velocity dispersion profile is derived from accurate radial velocity measurements, obtained at the ESO 8m VLT telescope with the FLAMES multi-object spectrograph. Reliable data for 184 and 146 bona fide cluster star members were obtained for NGC 1851 and NGC 1904, respectively.2011A&A...525A.148Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/525/A148CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/525/A148https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/525/A148http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/525/A148https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/525/A148https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/525/A148http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/525/A148GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/525/A148/veloc (Radial velocities observed in the 2 globulars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/525/A148/veloc?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/525/A148/veloc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/525/A148/veloc?GETtext/xml+votable180.050000true78.34875-40.08347220.0055555555555555566/21017 34242-34243https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/525/A148?format=asciiOpticaldefaultJ/A+A/525/A148/velocRadial velocities observed in the 2 globularsIDID numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCSimbad column added by the CDSmeta.id.parentintnullableSeqSequential number within the tablemeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVrms uncertainty on HRVkm/sstat.errorfloato_HRVNumber of spectra available for this starmeta.numberintVmagV magnitudemagphot.mag;em.opt.Vfloat