J/A+A/683/A167ivo://CDS.VizieR/J/A+A/683/A167doi:10.26093/cds/vizier.36830167CDSGran F.Kordopatis G.Zoccali M.Hill V.Saviane I.Navarrete C.,Rojas-Arriagada A.Carballo-Bello J.Hartke J.Valenti E.,Contreras Ramos R.De Leo M.Fabbro S.2024-11-29T20:01:11Z2024-07-18T15:35:17ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyglobular-star-clustersradial-velocityeffective-temperaturemetallicityvisible-astronomyAfter the second data release of Gaia, the number of new globular cluster candidates has increased significantly. However, most of them need to be properly characterised, both spectroscopically and photometrically, by means of radial velocities, metallicities, and deeper photometric observations. Our goal is to provide an independent confirmation of the cluster nature of Gran 4, a recently discovered globular cluster, with follow-up spectroscopic observations. The derived radial velocity for individual stars, coupled with proper motions, allows us to isolate cluster members from field stars, while the analysis of their spectra allows us to derive metallicities. By including in the analysis the recently confirmed clusters Gran 1, 2, 3, and 5, we aim to completely characterise recently discovered globular clusters. Using Gaia DR3 and VVV catalogue data and MUSE at VLT observations, we selected cluster members based on their proper motions, radial velocities and their position in colour-magnitude diagrams. Furthermore, full spectral synthesis was performed on the cluster members, extracting surface parameters and metallicity from MUSE spectra. Finally, a completeness estimation was performed on the total globular cluster population of the Milky Way. We confirm the nature of Gran 4, a newly discovered globular cluster behind the Galactic bulge, with a mean radial velocity of RV=-265.28+/-3.92km/s and a mean metallicity of [Fe/H]=-1.72+/-0.32dex. Additionally, independent measurements of the metallicities were derived for Gran 1, 2, 3, and 5. We also revise the observational lower mass limit for a globular cluster to survive in the bulge and disc environment. We estimate that ~12-26 globular clusters have still to be discovered on the other side of the Galaxy (i.e., behind the bulge, bar and disk), up to 20kpc.2024A&A...683A.167Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A167CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/683/A167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/683/A167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/683/A167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/683/A167https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/683/A167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/683/A167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/683/A167/table2 (Structural and dynamical parameters derived for the analysed GCs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/683/A167/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/683/A167/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/683/A167/table2?GETtext/xml+votable180.050000true269.651-32.020.005555555555555556Cone search capability for table J/A+A/683/A167/tablea (Atmospheric parameters for all MUSE Gran 1-Gran 5 analysed stars (Tables A1-A5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/683/A167/tablea?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/683/A167/tablea?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/683/A167/tablea?GETtext/xml+votable180.050000true269.64794-32.025590.0055555555555555566/28732 28908 28974 29221 42470https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/683/A167?format=asciiOpticaldefaultJ/A+A/683/A167/table2Structural and dynamical parameters derived for the analysed GCsRVMean radial velocitykm/sphys.veloc;pos.heliocentricfloatSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGCCluster name, Gran 0Nmeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLON[] Galactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatdLOSDistancekpcpos.distancefloate_RVCluster observational velocity dispersionkm/sstat.errorfloat[Fe/H]Median metallicityphys.abund.Z;stat.medianfloate_[Fe/H]Median metallicity errorstat.error;phys.abund.FefloatpmRAMean proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatpmDEMean proper motion along DEmas/yrpos.pm;pos.eq.decfloatNstarsNumber cluster member stars observedmeta.numberintJ/A+A/683/A167/tableaAtmospheric parameters for all MUSE Gran 1-Gran 5 analysed stars (Tables A1-A5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGC-ID, Gran NN-NNN (1)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeff? Effective temperatureKphys.temperature.effectiveintnullablelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullable[Fe/H]? Metallicityphys.abund.ZfloatnullableRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatS/NMean S/N were derived for observed GC members based on their multi-dimensional membership (RV, [Fe/H], and Kiel diagram)stat.snrint