J/ApJ/756/74ivo://CDS.VizieR/J/ApJ/756/74doi:10.26093/cds/vizier.17560074CDSFrinchaboy P.M.Majewski S.R.Munoz R.R.Law D.R.Lokas E.L.,Kunkel W.E.Patterson R.J.Johnston K.V.2014-05-25T17:26:28Z2014-05-25T17:24:39ZCDS support team

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

cds-question@unistra.frm-starsgiant-starsradial-velocitygalaxiesinfrared-sourcesinfrared-photometryWe have assembled a large-area spectroscopic survey of giant stars in the Sagittarius (Sgr) dwarf galaxy core. Using medium resolution (R~15000), multifiber spectroscopy we have measured velocities of these stars, which extend up to 12{deg} from the galaxy's center (3.7 core radii or 0.4 times the King limiting radius). From these high-quality spectra we identify 1310 Sgr members out of 2296 stars surveyed, distributed across 24 different fields across the Sgr core. Additional slit spectra were obtained of stars bridging from the Sgr core to its trailing tail. Our systematic, large-area sample shows no evidence for significant rotation, a result at odds with the ~20km/s rotation required as an explanation for the bifurcation seen in the Sgr tidal stream; the observed small (<=4km/s) velocity trend primarily along the major axis is consistent with models of the projected motion of an extended body on the sky with no need for intrinsic rotation. The Sgr core is found to have a flat velocity dispersion (except for a kinematically colder center point) across its surveyed extent and into its tidal tails, a property that matches the velocity dispersion profiles measured for other Milky Way dwarf spheroidal (dSph) galaxies. We comment on the possible significance of this observed kinematical similarity for the dynamical state of the other classical Milky Way dSphs in light of the fact that Sgr is clearly a strongly tidally disrupted system.2012ApJ...756...74Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/756/74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/MNRAS/427/2647 : Sgr dSph stars spectral classification (McDonald+, 2012)J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)J/A+A/513/A62 : Sgr dSph VIMOS phot. and radial velocities (Giuffrida+, 2010)J/ApJ/708/1290 : A 2MASS view of the Sgr dSph. VI. (Chou+, 2010)J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)J/ApJ/670/346 : M giant stars in the Sgr dwarf galaxy. V. (Chou+, 2007)J/AJ/128/245 : M giant stars in the Sgr dwarf galaxy (Majewski+, 2004)J/A+A/414/503 : Abundances in the Sgr dSph (Bonifacio+, 2004)J/AJ/113/634 : The survival of Sagittarius dwarf galaxy (Ibata+ 1997)J/AJ/110/1141 : Variables in the Sagittarius dSph (Mateo+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/756/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/756/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/756/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/756/74https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/756/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/756/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/756/74/table2 (Sagittarius stellar velocity data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/756/74/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/756/74/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/756/74/table2?GETtext/xml+votable180.050000true283.543625-30.43780560.005555555555555556Cone search capability for table J/ApJ/756/74/table5 (Supplementary radial velocity data on M giants observed with the DuPont telescope)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/756/74/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/756/74/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/756/74/table5?GETtext/xml+votable180.050000true298.3272917-34.81541670.0055555555555555565/11966 11984 12008 12011 6/28758 28759 28764 28765 28928 28929 28931 28932 28934 28937 28940 28945 28948 46526 46815 46828 46830 46898 46984 47475 47558 47582 47591 47592 47593 47594 47596 47598 47599 47602 47604 47608 47609 47610 47860 47861 47863 47869 47871 47903 47916 47918 47925 47926 47930 47931 47932 47940 47944 47945 47946 47952 47968 48002 48003 48007 48008 48010 48011 48013 48014 48015 48016 48017 48018 48024 48036 48037 48039 48041 48042 48043 48050 48058 48144 48163 48168 48172 48186 48256 48258 48266https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/756/74?format=asciiOpticalInfrareddefaultJ/ApJ/756/74/table2Sagittarius stellar velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldSagittarius field name (1)obs.fieldchar2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharKmag0[8.8/14] Dereddened 2MASS K magnitudemagphot.mag;em.IR.Kfloat(J-K)0[0.5/1.4] Dereddened 2MASS J-K color indexmagphot.color;em.IR.J;em.IR.KfloatE(B-V)[0.07/0.3] E(B-V) from Schlegel et al. 1998ApJ...500..525Smagphot.color.excessfloatGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latdoubleLambda[0.001/360] The Sgr longitude as viewed from the Sun ({Lambda}_{sun}_) (G1)degpos.earth.lonfloatHRV[-356.7/301.2] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[1.2/5] Mean error on radial velocitykm/sstat.errorfloatVgsr[-336.4/318.5] Galactocentric radial velocitykm/sspect.dopplerVeloc;pos.galactocentricfloatR[5/61] Tonry-Davis ratio (1979AJ.....84.1511T)stat.fit.paramfloatMm[YN] Membership flag (Y=yes, N=no)meta.code.errorchar_RAPosition from the 2MASS source name (right ascension part)degpos.eq.ra;meta.main_DEPosition from the 2MASS source name (declination part)degpos.eq.dec;meta.mainJ/ApJ/756/74/table5Supplementary radial velocity data on M giants observed with the DuPont telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharKmag0[9.7/12.4] Dereddened 2MASS K magnitudemagphot.mag;em.IR.Kfloat(J-K)0[0.9/1.3] Dereddened 2MASS J-K color indexmagphot.color;em.IR.J;em.IR.KfloatE(B-V)[0/0.2] E(B-V) from Schlegel et al. 1998ApJ...500..525Smagphot.color.excessfloatGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latfloatLambda[12.7/48.2] The Sgr longitude as viewed from the Sun ({Lambda}_{sun}_) (G1)degpos.earth.lonfloatHRV[-133.2/144.2] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatVgsr[-120.7/165.7] Galactocentric radial velocitykm/sspect.dopplerVeloc;pos.galactocentricfloatCCP[0.2/0.95] Peak of the cross-correlation spectrumstat.correlationfloatQ[4/7] Data quality (7=best; 0=worst)meta.code.qualintMm[YN] Membership flag (Y=yes, N=no)meta.code.errorchar_RAPosition from the 2MASS source name (right ascension part)degpos.eq.ra;meta.main_DEPosition from the 2MASS source name (declination part)degpos.eq.dec;meta.main