J/ApJ/785/63ivo://CDS.VizieR/J/ApJ/785/63doi:10.26093/cds/vizier.17850063CDSBhattacharjee P.Chaudhury S.Kundu S.2017-09-04T08:01:08Z2017-07-05T10:00:51ZCDS support team

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

cds-question@unistra.frmilky-way-galaxygalaxy-rotationstellar-distanceThe rotation curve (RC) of our Galaxy, the Milky Way, is constructed starting from its very inner regions (few hundred parsecs) out to a large galactocentric distance of ~200 kpc using kinematical data on a variety of tracer objects moving in the gravitational potential of the Galaxy, without assuming any theoretical models of the visible and dark matter (DM) components of the Galaxy. We study the effect on the RC due to the uncertainties in the values of the Galactic constants (GCs) R_0_ and V_0_ (these being the Sun's distance from and circular rotation speed around the Galactic center, respectively) and the velocity anisotropy parameter {beta} of the halo tracer objects used for deriving the RC at large galactocentric distances. The resulting RC in the disk region is found to depend significantly on the choice of the GCs, while the dominant uncertainty in the RC at large distances beyond the stellar disk comes from the uncertainty in the value of {beta}. In general we find that the mean RC steadily declines at distances beyond ~60 kpc, independently of the value of {beta}. Also, at a given radius, the circular speed is lower for larger values of {beta} (i.e., for more radially biased velocity anisotropy). Considering that the largest possible value of {beta} is unity, which corresponds to stellar orbits being purely radial, our results for the case of {beta}=1 give a lower limit to the total mass of the Galaxy within ~200 kpc, M(200 kpc)>~(6.8+/-4.1)x10^11^ M_{sun}_, independently of any model of the DM halo of the Galaxy.2014ApJ...785...63Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/785/63CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/70 : Galaxies Rotation Curves (Baiesi-Pillastrini+ 1983)J/A+A/275/67 : Velocity Field of the outer Galaxy (Brand+ 1993)J/AJ/139/59 : Milky Way halo velocity dispersion profile (Brown+, 2010)J/ApJ/714/1170 : Faraday rotation at high Galactic latitude (Mao+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/785/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/785/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/785/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/785/63https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/785/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/785/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/785/63/table2Rotation Curve of the Milky WayrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintR0Sun's distance from Galactic centerkpcpos.distance;pos.galactocentricfloatV0Sun's circular rotation velocity around Galactic centerkm/sphys.veloc.rotatintrDistance from Galactic centerkpcpos.distance;pos.galactocentricfloatVcCircular velocitykm/sphys.velocfloate_VcThe 1-{sigma} error in Vckm/sstat.error;pos.cartesian.yfloat