J/ApJ/736/146ivo://CDS.VizieR/J/ApJ/736/146doi:10.26093/cds/vizier.17360146CDSKoposov S.E.Gilmore G.Walker M.G.Belokurov V.Evans N.W.,Fellhauer M.Gieren W.Geisler D.Monaco L.Norris J.E.Okamoto S.,Penarrubia J.Wilkinson M.Wyse R.F.G.Zucker D.B.2018-01-05T08:55:58Z2013-02-04T08:02:44ZCDS support team

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

cds-question@unistra.frgalaxiesradial-velocityvisible-astronomysloan-photometrymetallicityWe develop, implement, and characterize an enhanced data reduction approach which delivers precise, accurate, radial velocities from moderate resolution spectroscopy with the fiber-fed VLT/FLAMES+GIRAFFE facility. This facility, with appropriate care, delivers radial velocities adequate to resolve the intrinsic velocity dispersions of the very faint dwarf spheroidal (dSph) galaxies. Importantly, repeated measurements let us reliably calibrate our individual velocity errors (0.2km/s<={delta}_V_<=5km/s) and directly detect stars with variable radial velocities. We show, by application to the Bootes I dSph, that the intrinsic velocity dispersion of this system is significantly below 6.5km/s reported by previous studies. Our data favor a two-population model of Bootes I, consisting of a majority "cold" stellar component, with velocity dispersion 2.4^+0.9^_-0.5_km/s, and a minority "hot" stellar component, with velocity dispersion ~9km/s, although we cannot completely rule out a single component distribution with velocity dispersion 4.6^0.8^_-0.6_km/s. We speculate that this complex velocity distribution actually reflects the distribution of velocity anisotropy in Bootes I, which is a measure of its formation processes.2011ApJ...736..146Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/736/146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/ApJ/723/1632 : Abundance spreads in Bootes I and Segue 1 (Norris+, 2010)J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)J/AJ/136/2321 : Washington photometry of Bootes I stars (Hughes+, 2008)J/MNRAS/380/281 : Galactic satellites spectroscopic survey (Martin+, 2007)J/A+A/407/1157 : UVES sky atlas (Hanuschik+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/736/146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/736/146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/736/146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/736/146https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/736/146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/736/146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/736/146/table1 (Observational data for all stars observed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/736/146/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/736/146/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/736/146/table1?GETtext/xml+votable180.050000true209.83914.60170.0055555555555555566/87452.85864675833786e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/736/146?format=asciiOpticaldefaultJ/ApJ/736/146/table1Observational data for all stars observedSimbadNameSimbad column added by the CDSmeta.idcharMm[B] Best flag (1)meta.code.membercharSeq[0/117] Running sequence numbermeta.id;meta.mainintprimarySDSSStar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000[209.8/210.3] Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[14.3/14.8] Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmag[16.6/22.4] SDSS g-band magnitudemagphot.mag;em.opt.BfloatrmagSDSS r-band magnitudemagphot.mag;em.opt.RfloatRV[-236/225]? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV[0.05/9.14]? RV uncertaintykm/sstat.errorfloatnullablePvar[0/1]? Probability of detected radial velocity variabilitystat.fit.goodness;src.varfloatnullableTeff[4000/9000]? Effective temperatureKphys.temperature.effectiveintnullable[Fe/H][-2.5/0]? Fe/H abundancelog(Sun)phys.abund.Fefloatnullablelogg[1/4.5]? Surface gravitylog(cm.s**-2)phys.gravityfloatnullableDR7Cross-match with the SDSS photometric catalog, DR7 (Cat. II/294), within 1"meta.ref.urlcharSloanDisplay the SDSS data for this starmeta.ref.urlchar