J/A+A/599/A12ivo://CDS.VizieR/J/A+A/599/A12doi:10.26093/cds/vizier.35990012CDSZoccaliM.VasquezS.GonzalezO. A.ValentiE.,Rojas-ArriagadaA.MinnitiJ.RejkubaM.MinnitiD.McWilliamA.,BabusiauxC.HillV.RenziniA.2018-12-03T13:09:28Z2017-02-22T17:39:19ZCDS support team

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

cds-question@unistra.frmilky-way-galaxychemical-abundancesphotometryradial-velocitySeveral recent studies have demonstrated that the Galactic bulge hosts two components with different mean metallicities, and possibly different spatial distribution and kinematics. As a consequence, both the metallicity distribution and the radial velocity of bulge stars vary across different line of sights. We present here the metallicity distribution function of red clump stars in 26 fields spread across a wide area of the bulge, with special emphasis on fields close to Galactic plane, at latitudes b=-2 and b=-1, that were not explored before. This work includes new metallicities from a sample of ~5000 K giant stars, observed at spectral resolution R~6500, in the Calcium II Triplet region. They are the main dataset of the GIRAFFE Inner Bulge Survey. As part of the same survey we have previously published results for a sample of ~600 K giant stars, at latitude b~-4 derived from higher resolution spectra (R=22500). The combined sample allows us to trace and characterize the metal poor and metal rich bulge populations down to the inner bulge. We present a density map for each of the two components. Contrary to the expectations from previous works, we found the metal poor population to be more centrally concentrated than the metal rich one, and with a more axisymmetric spatial distribution. The metal rich population, on the other hand, is arranged in a boxy distribution, consistent with an edge-on bar. By coupling metallicities and radial velocities we show that the metal poor population has a velocity dispersion that varies rather mildly with latitude. On the contrary, the metal rich population has a low velocity dispersion far from the plane (b=-8.5) but it has a steeper gradient with latitude, becoming higher than the metal poor one in the innermost field (b=-1). This work provides new observational constraints on the actual chemodynamical properties of the Galactic bulge, that will help discriminating among different formation models.2017A&A...599A..12Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/599/A12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/562/A66 : GIRAFFE Inner Bulge Survey (GIBS). I. (Zoccali+, 2014)J/A+A/584/A46 : GIRAFFE Inner Bulge Survey (GIBS). II. (Gonzalez+, 2015)J/A+A/580/A121 : Galactic bulge stars CaT/[Fe/H] calibration (Vasquez+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/599/A12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/599/A12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/599/A12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/599/A12https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/599/A12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/599/A12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/599/A12/table1 (Coordinates, VVV magnitudes, radial velocities and metallicities of the program stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/599/A12/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/599/A12/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/599/A12/table1?GETtext/xml+votable180.050000true267.58608306-29.978416940.0055555555555555565/7242 6/28673 28682 28691 28694 28698 28704 28706-28707 28716 28720 28738-28739 28744-28745 28761 28763 28768 28770 28778 28786 28792 28801 28821-28823 28843 28858 28867-28869 28887 28895 28961 29200 29252 29254 29267 29270 29273 29276 42366-42367 42452-42453 42488 42490https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/599/A12?format=asciidefaultJ/A+A/599/A12/table1Coordinates, VVV magnitudes, radial velocities and metallicities of the program starsSimbadNameSimbad column added by the CDSmeta.idchar[Fe/H]Metallicitylog(Sun)phys.abund.ZfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDLabelmeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainJmag? VVV J magnitudemagphot.mag;em.IR.JfloatnullableKsmag? VVV Ks magnitudemagphot.mag;em.IR.KfloatnullableHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVHeliocentric radial velocity errorkm/sstat.errorfloat