J/ApJ/708/717ivo://CDS.VizieR/J/ApJ/708/717doi:10.26093/cds/vizier.17080717CDSSesar B.Ivezic Z.Grammer S.H.Morgan D.P.Becker A.C.Juric M.,De Lee N.Annis J.Beers T.C.Fan X.Lupton R.H.Gunn J.E.,Knapp G.R.Jiang L.Jester S.Johnston D.E.Lampeitl H.2017-07-04T07:08:49Z2012-03-26T12:34:16ZCDS support team

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

cds-question@unistra.frvisible-astronomysloan-photometryvariable-starshalo-starsWe present an improved analysis of halo substructure traced by RR Lyrae stars in the Sloan Digital Sky Survey (SDSS) stripe 82 region. With the addition of SDSS-II data, a revised selection method based on new ugriz light curve templates results in a sample of 483 RR Lyrae stars that is essentially free of contamination. The main result from our first study persists: the spatial distribution of halo stars at galactocentric distances 5-100kpc is highly inhomogeneous. At least 20% of halo stars within 30kpc from the Galactic center can be statistically associated with substructure. We present strong direct evidence, based on both RR Lyrae stars and main-sequence stars, that the halo stellar number density profile significantly steepens beyond a Galactocentric distance of ~30kpc, and a larger fraction of the stars are associated with substructure. By using a novel method that simultaneously combines data for RR Lyrae and main-sequence stars, and using photometric metallicity estimates for main-sequence stars derived from deep co-added u-band data, we measure the metallicity of the Sagittarius dSph tidal stream (trailing arm) toward RA~2h-3h and DE~0{deg} to be 0.3dex higher ([Fe/H]=-1.2) than that of surrounding halo field stars.2010ApJ...708..717Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/708/717CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/A+A/526/A28 : SDSS-II supernovae NTT and NOT spectroscopy (Oestman+, 2011)J/ApJS/186/233 : Variable point sources in SDSS stripe 82. I. (Bhatti+, 2010)J/AJ/130/1640 : Photometry of candidate RR Lyrae stars in the SDSS (Wu+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/708/717https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/708/717http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/708/717https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/708/717https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/708/717http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/708/717GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/708/717/RR_Lyr (Stripe 82 RR Lyrae stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/708/717/RR_Lyr?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/708/717/RR_Lyr?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/708/717/RR_Lyr?GETtext/xml+votable180.050000true0.935678891.115858890.0055555555555555565/4453 4694 4709 4714 4757 4758 4761 4773 4774 4778 7509 7510 6/1 2 12288 12289 12290 17405 17406 17407 17726 17727 17748 17749 17755 17756 17761 17765 17767 17768 17769 17770 17772 17773 17774 17776 17777 17807 17811 17817 17818 17819 17820 17821 17822 17827 17829 17830 17832 17833 17842 17856 17982 17983 17999 18001 18004 18009 18011 18013 18017 18018 18021 18022 18024 18025 18028 18033 18069 18070 18074 18075 18076 18077 18078 18082 18083 18085 18086 18087 18090 18092 18094 18097 18098 18114 18177 18178 18679 18685 18686 18687 18750 18751 18765 18767 18770 18771 18772 18773 18774 18780 18781 18782 18785 18786 18788 18790 18791 18795 18796 18797 18798 18800 18802 18830 18831 18834 18840 18841 18843 18844 18849 18850 18851 18852 18853 18854 18860 18866 18880 18881 18882 19005 19006 19007 19021 19022 19023 19026 19027 19037 19041 19042 19048 19050 19051 19052 19053 19054 19056 19057 19058 19083 19085 19086 19087 19091 19100 19101 19102 19105 19106 19107 19108 19110 19111 19116 19117 19120 19121 19122 19128 19136 19137 19138 19200 19456 19457 19458 23102 23103 23139 23145 23146 23147 23148 23150 23185 23186 23189 23190 23191 23194 23195 23196 23197 23198 23204 23205 23210 23212 23217 23218 23232 23233 30029 30030 30031 30033 30034 30035 30044 30045 30046 30052 30053 30055 30064 30065 30066 36861 36862 36863 49149 49150 491512.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/708/717?format=asciiOpticaldefaultJ/ApJ/708/717/RR_LyrStripe 82 RR Lyrae starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SIG2010]RR Lyrae identification numbermeta.id;meta.mainintType[abc ] RR Lyrae typemeta.code;src.varcharLCLight curve of this RR Lyr starmeta.ref.urlcharPerPerioddtime.perioddoubleuAmpBest-fit template u band amplitudemagsrc.var.amplitudefloatumag1Best-fit template u band maximum brightness (1)magphot.mag;em.opt.UfloatT0.uBest-fit template u band epoch of maximum brightness (MJD)dtime.epoch;stat.maxdoubleTuBest-fit template u band ID numbermeta.idintnullablegAmpBest-fit template g band amplitudemagsrc.var.amplitudefloatgmag1Best-fit template g band maximum brightness (1)magphot.mag;em.opt.BfloatT0.gBest-fit template g band epoch of maximum brightness (MJD)dtime.epoch;stat.maxdoubleTgBest-fit template g band ID numbermeta.idintnullablerAmpBest-fit template r band amplitudemagsrc.var.amplitudefloatrmag1Best-fit template r band maximum brightness (1)magphot.mag;em.opt.RfloatT0.rBest-fit template r band epoch of maximum brightness (MJD)dtime.epoch;stat.maxdoubleTrBest-fit template r band ID numbermeta.idintnullableiAmpBest-fit template i band amplitudemagsrc.var.amplitudefloatimag1Best-fit template i band maximum brightness (1)magphot.mag;em.opt.IfloatT0.iBest-fit template i band epoch of maximum brightness (MJD)dtime.epoch;stat.maxdoubleTiBest-fit template i band ID numbermeta.idintnullablezAmpBest-fit template z band amplitudemagsrc.var.amplitudefloatzmag1Best-fit template z band maximum brightness (1)magphot.mag;em.opt.IfloatT0.zBest-fit template z band epoch of maximum brightness (MJD)dtime.epoch;stat.maxdoubleTzBest-fit template z band ID numbermeta.idintnullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainArSchlegel et al. 1998ApJ...500..525S ISM extinction in r bandmagphot.magfloatDistHeliocentric distancekpcpos.distancefloatRGCGalactocentric distancekpcpos.distance;pos.galactocentricfloatumagFlux-averaged u band magnitude (1)magphot.mag;em.opt.UfloatgmagFlux-averaged g band magnitude (1)magphot.mag;em.opt.BfloatrmagFlux-averaged r band magnitude (1)magphot.mag;em.opt.RfloatimagFlux-averaged i band magnitude (1)magphot.mag;em.opt.IfloatzmagFlux-averaged z band magnitude (1)magphot.mag;em.opt.IfloatVmagFlux-averaged V band magnitude (1)magphot.mag;em.opt.Vfloatu-gMedian (u-g) color at minimum brightness (1)magphot.color;em.opt.U;em.opt.Bfloate_u-gUncertainty in u-gmagstat.errorfloatg-rMedian (g-r) color at minimum brightness (1)magphot.color;em.opt.B;em.opt.Rfloate_g-rUncertainty in g-rmagstat.error;phot.color;em.opt.BfloatDR7Display the SDSS-DR7 photometric catalog within 3" (Cat. II/294)meta.ref.urlcharSloanDisplay the SDSS online data for this RR Lyrae starmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar