J/MNRAS/417/1823ivo://CDS.VizieR/J/MNRAS/417/1823doi:10.26093/cds/vizier.74171823CDSAlves-Brito A.Hau G.K.T.Forbes D.A.Spitler L.R.Strader J.,Brodie J.P.Rhode K.L.2024-07-15T20:16:56Z2018-03-22T16:11:53ZCDS support team

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

cds-question@unistra.frglobular-star-clustersradial-velocityinfrared-photometryvisible-astronomybroad-band-photometrymetallicitygalaxy-classification-systemsWe present a large sample of over 200 integrated-light spectra of confirmed globular clusters (GCs) associated with the Sombrero (M104) galaxy taken with the Deep Imaging Multi-Object Spectrograph (DEIMOS) instrument on the Keck telescope. A significant fraction of the spectra have signal-to-noise ratio levels high enough to allow measurements of GC metallicities using the method of Brodie & Huchra. We find a distribution of spectroscopic metallicities in the range -2.2<[Fe/H]<+0.1 that is bimodal, with peaks at [Fe/H]~-1.4 and -0.6. Thus, the GC system of the Sombrero galaxy, like a few other galaxies now studied in detail, reveals a bimodal spectroscopic metallicity distribution supporting the long-held belief that colour bimodality reflects two metallicity subpopulations. This further suggests that the transformation from optical colour to metallicity for old stellar populations, such as GCs, is not strongly non-linear. We also explore the radial and magnitude distribution with metallicity for GC subpopulations but small number statistics prevent any clear trends in these distributions.2011MNRAS.417.1823Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/417/1823CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/132/1593 : BVR photometry of NGC 4594 globular clusters (Spitler+, 2006)J/ApJ/658/980 : New velocities for 62 M104 globular clusters (Bridges+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/417/1823https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/417/1823http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/417/1823https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/417/1823https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/417/1823http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/417/1823GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/417/1823/tablea1 (IDs, positions and velocities for the sample.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/417/1823/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/417/1823/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/417/1823/tablea1?GETtext/xml+votable180.050000true190.153875-11.68820830.0055555555555555566/250833.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/417/1823?format=asciiOpticalInfrareddefaultJ/MNRAS/417/1823/tablea1IDs, positions and velocities for the sample.RVRadial velocitykm/sphys.veloc;pos.heliocentricintONameAlternative ID (SNNN)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGCindicates magnitudes, colours, indices and metallicities for the GC candidate samplemeta.ref.urlcharIDName (RZNNNN or SNNN), [RZ2004] GCl NNNN or [SLS2006] NNN in Simbabmeta.id;meta.maincharprimaryMask[1/4] Mask numbermeta.id;instrintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainMajMajor axisarcminphys.angSizefloatMinMajor axisarcminphys.angSize;srcfloatRpProjected distance from the centre of the galaxyarcminpos.distancefloate_RVrms uncertainty on RVkm/sstat.errorintSimbadNameSimbad column added by the CDSmeta.idcharJ/MNRAS/417/1823/tableb1IDs, magnitudes, colours, indices and metallicities for the GC candidate samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName (RZNNNN or SNNN)meta.id;meta.maincharONameAlternative ID (SNNN)meta.idcharVmagV magnitudemagphot.mag;em.opt.VfloatB-RB-R colour indexmagphot.color;em.opt.B;em.opt.RfloatCHCH indexmeta.code;spect.indexfloate_CH? rms uncertainty on CHstat.errorfloatnullable[Fe/H]CH? Metallicity [Fe/H] from CH indexphys.abund.Zfloatnullablee_[Fe/H]CH? rms uncertainty on [Fe/H]CHstat.error;phys.abund.FefloatnullableMgb? Mgb indexmeta.code;spect.indexfloatnullablee_Mgb? rms uncertainty on Mgbstat.errorfloatnullable[Fe/H]Mgb? Metallicity [Fe/H] from Mgb indexphys.abund.Zfloatnullablee_[Fe/H]Mgb? rms uncertainty on [Fe/H]Mgbstat.error;phys.abund.FefloatnullableFe5270? Fe5270 indexmeta.code;spect.indexfloatnullablee_Fe5270? rms uncertainty on Fe5270stat.errorfloatnullable[Fe/H]Fe5270? Metallicity [Fe/H] from Fe5270 indexphys.abund.Zfloatnullablee_[Fe/H]Fe5270? rms uncertainty on [Fe/H]Fe5270stat.error;phys.abund.Fefloatnullable[Fe/H]? Final metallicity [Fe/H]phys.abund.Zfloatnullablee_[Fe/H]? rms uncertainty on [Fe/H]stat.error;phys.abund.Fefloatnullable