J/ApJ/885/87ivo://CDS.VizieR/J/ApJ/885/87doi:10.26093/cds/vizier.18850087CDSMcGaugh S.S.2022-03-15T08:00:47Z2021-09-28T06:21:53ZCDS support team

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

cds-question@unistra.frastronomical-modelsmilky-way-galaxygalaxy-rotationWe discuss a model for the Milky Way obtained by fitting the observed terminal velocities with the radial acceleration relation. The resulting stellar surface density profile departs from a smooth exponential disk, having bumps and wiggles that correspond to massive spiral arms. These features are used to estimate the term for the logarithmic density gradient in the Jeans equation, which turn out to have exactly the right location and amplitude to reconcile the apparent discrepancy between the stellar rotation curve and that of the interstellar gas. This model also predicts a gradually declining rotation curve outside the solar circle with slope -1.7km/s/kpc, as subsequently observed.2019ApJ...885...87Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/885/87CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/ApJ/827/L19 : Central surface densities in SPARC disk galaxies (Lelli+, 2016)J/ApJ/831/124 : Milky Way kinematics. II. (McClure-Griffiths+, 2016)J/ApJ/816/42 : Mass models for the Milky Way (McGaugh, 2016)J/MNRAS/486/2995 : GD-1 stellar stream (Malhan+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/885/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/885/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/885/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/885/87https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/885/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/885/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/885/87/table2Milky Way mass modelRadGalaxy model radiuskpcphys.size.radius;meta.modelleddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVbulgeCircular speed of bulge gravitational potentialkm/sphys.velocdoubleVgasCircular speed of gas gravitational potentialkm/sphys.velocdoubleVdiskCircular speed of disk gravitational potentialkm/sphys.velocfloatVcCircular speed of model gravitational potential (1)km/sphys.velocfloatSbulgeSurface Density of the bulgesolMass.pc**-2phot.flux.density.sbdoubleSdiskSurface Density of the disksolMass.pc**-2phot.flux.density.sbfloatSgasSurface Density of gassolMass.pc**-2phot.flux.density.sbfloatJ/ApJ/885/87/table3Jeans term and rotation curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRadGalaxy Radiuskpcphys.size.radiusfloatdSdRlogarithmic density gradientarith.gradfloatE_dSdRUpper error in dSdRstat.error;stat.maxfloate_dSdRLower error in dSdRstat.errorfloatVccCircular speedkm/sphys.velocfloatE_VccUpper error in Vcckm/sstat.error;stat.maxfloate_VccLower error in Vcckm/sstat.errorfloat