J/MNRAS/442/1663ivo://CDS.VizieR/J/MNRAS/442/1663doi:10.26093/cds/vizier.74421663CDSDobbie P.D.Cole A.A.Subramaniam A.Keller S.2024-08-09T20:15:16Z2015-06-11T08:53:55ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsgiant-starsradial-velocityWe present results from an extensive spectroscopic survey of field stars in the Small Magellanic Cloud (SMC). 3037 sources, predominantly first-ascent red giants, spread across roughly 37.5deg^2^, are analysed. The line-of-sight velocity field is dominated by the projection of the orbital motion of the SMC around the Large Magellanic Cloud/Milky Way. The residuals are inconsistent with both a non-rotating spheroid and a nearly face on disc system. The current sample and previous stellar and Hi kinematics can be reconciled by rotating disc models with line-of-nodes position angle {Theta} ~120{deg}-130{deg}, moderate inclination (25{deg}-70{deg}), and rotation curves rising at 20-40km/s/kpc. The metal-poor stars exhibit a lower velocity gradient and higher velocity dispersion than the metal-rich stars. If our interpretation of the velocity patterns as bulk rotation is appropriate, then some revision to simulations of the SMC orbit is required since these are generally tuned to the SMC disc line of nodes lying in a north-east-south-west (SW) direction. Residuals show strong spatial structure indicative of non-circular motions that increase in importance with increasing distance from the SMC centre. Kinematic substructure in the north-west part of our survey area is associated with the tidal tail or Counter-Bridge predicted by simulations. Lower line-of-sight velocities towards the Wing and the larger velocities just beyond the SW end of the SMC Bar are probably associated with stellar components of the Magellanic-Bridge and Counter-Bridge, respectively. Our results reinforce the notion that the intermediate-age stellar population of the SMC is subject to substantial stripping by external forces.2014MNRAS.442.1663Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/442/1663CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/304/347 : 40 field red supergiants in the SMC (Meliani+, 1995)J/AJ/131/2514 : Radial velocities of red giants in the SMC (Harris+, 2006)J/AJ/136/1039 : CaII index of SMC red giant branch stars (Carrera+, 2008)J/AJ/138/517 : CaII spectroscopy of SMC red giants (Parisi+, 2009)J/ApJ/754/35 : Red supergiant stars in the SMC. II. (Yang+, 2012)J/MNRAS/442/1680 : Red giants in SMC. Abundnances (Dobbie+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/442/1663https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/442/1663http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/442/1663https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/442/1663https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/442/1663http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/442/1663GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/442/1663/table4 (Details of the 4172 red giants identified in our spectroscopic follow-up of sources towards the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/442/1663/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/442/1663/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/442/1663/table4?GETtext/xml+votable180.050000true0.1178333-75.55122220.005555555555555556Cone search capability for table J/MNRAS/442/1663/table5 (*Details of the 352 carbon rich giants that were included in our spectroscopic survey of the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/442/1663/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/442/1663/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/442/1663/table5?GETtext/xml+votable180.050000true1.2395417-76.41880560.0055555555555555565/8238 8321-8324 8326 8328-8329 8331-8333 6/32943 33300 33302 33308 33310-33311 33321 33323 33336-33338 33409 33411-33414 33424 45317 453288.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/442/1663?format=asciiOpticaldefaultJ/MNRAS/442/1663/table4Details of the 4172 red giants identified in our spectroscopic follow-up of sources towards the SMCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main2MASS2MASS star name (HHMMSSss+DDMMSSs)meta.id;meta.maincharJmag[12/15.2] 2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag[0.02/0.08] rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatKsmag[10/14.6] 2MASS Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmag[0.02/0.11] rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatHcorr[10.6/13.9] Heliocentric correction on velocitykm/sphys.veloc;arith.difffloatvmod[17/316] Model velocitykm/sphys.veloc;meta.modelledfloatHV[56/249] Heliocentric velocity of starkm/sspect.dopplerVeloc;pos.heliocentricfloate_HV[1.7/9] rms uncertainty on HVkm/sstat.errorfloat2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/MNRAS/442/1663/table5*Details of the 352 carbon rich giants that were included in our spectroscopic survey of the SMCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main2MASS2MASS star name (HHMMSSss+DDMMSSs)meta.id;meta.maincharJmag[12/15.2] 2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag[0.02/0.08] rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatKsmag[10/14.6] 2MASS Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmag[0.02/0.11] rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatHcorr[10.6/13.9] Heliocentric correction on velocitykm/sphys.veloc;arith.difffloatvmod[17/316] Model velocitykm/sphys.veloc;meta.modelledfloatHV[56/249] Heliocentric velocity of starkm/sspect.dopplerVeloc;pos.heliocentricfloate_HV[1.7/9] rms uncertainty on HVkm/sstat.errorfloat2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar