J/MNRAS/485/2312ivo://CDS.VizieR/J/MNRAS/485/2312doi:10.26093/cds/vizier.74852312CDSHarris A.Drew J.E.Monguio M.2024-08-19T20:17:18Z2019-03-26T08:03:25ZCDS support team

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

cds-question@unistra.frgalaxy-planesmilky-way-galaxyradial-velocityproper-motionsspectrophotometryearly-type-starsA and F stars can be used as probes of outer Galactic disk kinematics: here we extend the work of Harris et al. (2018, Cat. J/MNRAS/475/1680) by crossmatching their A/F sample with Gaia DR2 to bring in proper motions. These are combined with the already measured radial velocities and spectro-photometric distances to obtain full space motions. We use this sample of 1173 stars, located in two pencil-beam sightlines (l=178{deg} and l=118{deg}), to sample the Galactocentric velocity field out to almost R_G_=15kpc. We find there are significant differences in all three (radial, azimuthal and vertical) kinematic components between the two directions. The rotation curve is roughly flat in the anticentre direction, confirming and extending the result of Kawata et al. (2018MNRAS.479L.108K) thanks to the greater reach of our spectro-photometric distance scale. However at l=118{deg} the circular velocity rises outwards from R_G_=10.5kpc and there is a more pronounced gradient in radial motion than is seen at l=178{deg}. Furthermore, the A star radial motion differs from the F stars by ~10km/s. We discuss our findings in the context of perturbers potentially responsible for the trends, such as the central bar, spiral arms, the warp and external satellites. Our results at l=178{deg} are broadly consistent with previous work on K giants in the anticentre, but the kinematics at l=118{deg} in the Perseus region do not yet reconcile easily with bar or spiral arm perturbation.2019MNRAS.485.2312Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/485/2312CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/MNRAS/475/1680 : Parameters of 1183 A and F stars (Harris+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/485/2312https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/485/2312http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/485/2312https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/485/2312https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/485/2312http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/485/2312GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/485/2312/table (Table of data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/485/2312/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/485/2312/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/485/2312/table?GETtext/xml+votable180.050000true1.6187564.59896860.0055555555555555566/3067 3070 24475 24478 24497 24500https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/485/2312?format=asciidefaultJ/MNRAS/485/2312/tableTable of dataGLATGalactic latitudedegpos.galactic.latdoubleHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVRadial velocity negative errorkm/sstat.errorfloatE_HRVRadial velocity positive errorkm/sstat.error;stat.maxfloatDistHeliocentric distancekpcpos.distancefloate_DistHeliocentric distance errorkpcstat.errorfloatRGGalactocentric distancekpcpos.distance;pos.galactocentricfloate_RGGalactocentric distance errorkpcstat.errorfloatSourceIDGaia DR2 Source IDmeta.idpmGLON*Proper motion in Galactic longitude, pmGLON*cosGLAT (1)mas/yrpos.pmfloate_pmGLON*Error of proper motion in Galactic longitudemas/yrstat.errorfloatpmGLATProper motion in Galactic latitude directionmas/yrpos.pmfloate_pmGLATError in proper motion in Gal. latitudemas/yrstat.errorfloatuGalactocentric radial velocitykm/sphys.veloc;pos.cartesian.xfloate_uGalactocentric radial velocity errorkm/sstat.errorfloatvGalactocentric azimuthal velocitykm/sphys.veloc;pos.cartesian.yfloate_vGalactocentric azimuthal velocity errorkm/sstat.errorfloatwGalactocentric vertical velocitykm/sphys.veloc;pos.cartesian.zfloate_wGalactocentric vertical velocity errorkm/sstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDTarget IDmeta.id;meta.maincharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lon