J/MNRAS/451/3400ivo://CDS.VizieR/J/MNRAS/451/3400doi:10.26093/cds/vizier.74513400CDSBeasley M.A.San Roman IGallart G.Sarajedini A.Aparicio A.2024-08-15T20:13:53Z2015-08-21T10:32:50ZCDS support team

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

cds-question@unistra.fropen-star-clustersglobular-star-clustersgalaxiesWe present precision radial velocities and stellar population parameters for 77 star clusters in the Local Group galaxy M33. Our Gran Telescopio de Canarias and William Herschel Telescope observations sample both young, massive clusters and known/candidate globular clusters (GCs), spanning ages ~10^6-10^10yr, and metallicities, [M/H]~-1.7 to solar. The cluster system exhibits an age-metallicity relation; the youngest clusters are the most metal rich. When compared to HI data, clusters with [M/H]~-1.0 and younger than ~4Gyr are clearly identified as a disc population. The clusters show evidence for strong time evolution in the disc radial metallicity gradient (d[M/H]dt/dR=0.03dex/kpc/Gyr). The oldest clusters have stronger, more negative gradients than the youngest clusters in M33. The clusters also show a clear age-velocity dispersion relation. The line-of-sight velocity dispersions of the clusters increases with age similar to Milky Way open clusters and stars. The general shape of the relation is reproduced by disc heating simulations, and the similarity between the relations in M33 and the Milky Way suggests that heating by substructure and cooling of the interstellar medium both play a role in shaping this relation. We identify 12 'classical' GCs, six of which are newly identified GC candidates. The GCs are more metal rich than Milky Way halo clusters, and show weak rotation. The inner (R<4.5kpc) GCs exhibit a steep radial metallicity gradient (d[M/H]/dR=-0.29+/-0.11dex/kpc) and an exponential-like surface density profile. We argue that these inner GCs are thick disc rather than halo objects.2015MNRAS.451.3400Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/451/3400CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/134/447 : Catalog of star cluster candidates in M 33 (Sarajedini+, 2007)J/ApJ/720/1674 : CFHT M33 extended sources catalog (San Roman+, 2010)J/MNRAS/426/2427 : Structural parameters of M33 clusters (San Roman+, 2012)J/ApJS/211/22 : Updated photometry for star clusters in M33 (Fan+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/451/3400https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/451/3400http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/451/3400https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/451/3400https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/451/3400http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/451/3400GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/451/3400/table2 (Co-ordinates, velocities, ages and metallicities of 77 M33 star clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/451/3400/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/451/3400/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/451/3400/table2?GETtext/xml+votable180.050000true23.230791730.64404720.0055555555555555566/2154-2155 2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/451/3400?format=asciidefaultJ/MNRAS/451/3400/table2Co-ordinates, velocities, ages and metallicities of 77 M33 star clustersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCluster ID (1)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainAge[0.009/15.8] Cluster ageGyrtime.agefloate_Age[0.001/3.8] Uncertainty in ageGyrstat.error;time.agefloat[M/H][-1.8/0.2] Cluster metallicity (in dex)log(Sun)phys.abund.Zfloate_[M/H][0.1/0.32] Uncertainty in metallicity (in dex)log(Sun)stat.error;phys.abundfloatHRV[-262/-21] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricinte_HRV[2/30] Uncertainty in radial velocitykm/sstat.errorintVHI[-261/-100] HI velocity at cluster locationkm/sspect.dopplerVelocintPA[0/360] Position angle (East of North) of clusterdegpos.posAngfloatNotesComments on cluster propertiesmeta.notechar