The Milky Way Tomography With SDSS. II. Stellar Metallicity

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dc.contributor.utaustinauthorPrieto, Carlos Allendeen_US
dc.creatorIvezic, Zeljkoen_US
dc.creatorSesar, Branimiren_US
dc.creatorJuric, Marioen_US
dc.creatorBond, Nicholasen_US
dc.creatorDalcanton, Julianneen_US
dc.creatorRockosi, Constance M.en_US
dc.creatorYanny, Brianen_US
dc.creatorNewberg, Heidi J.en_US
dc.creatorBeers, Timothy C.en_US
dc.creatorPrieto, Carlos Allendeen_US
dc.creatorWilhelm, Ronen_US
dc.creatorLee, Young Sunen_US
dc.creatorSivarani, Thirupathien_US
dc.creatorNorris, John E.en_US
dc.creatorBailer-Jones, Coryn A. L.en_US
dc.creatorFiorentin, Paola Reen_US
dc.creatorSchlegel, Daviden_US
dc.creatorUomoto, Alanen_US
dc.creatorLupton, Robert H.en_US
dc.creatorKnapp, Gillian R.en_US
dc.creatorGunn, James E.en_US
dc.creatorCovey, Kevin R.en_US
dc.creatorSmith, J. Allynen_US
dc.creatorMiknaitis, Gajusen_US
dc.creatorDoi, Mamoruen_US
dc.creatorTanaka, Masayukien_US
dc.creatorFukugita, Masatakaen_US
dc.creatorKent, Steveen_US
dc.creatorFinkbeiner, Douglasen_US
dc.creatorMunn, Jeffrey A.en_US
dc.creatorPier, Jeffrey R.en_US
dc.creatorQuinn, Tomen_US
dc.creatorHawley, Suzanneen_US
dc.creatorAnderson, Scotten_US
dc.creatorKiuchi, Fureaen_US
dc.creatorChen, Alexen_US
dc.creatorBushong, Jamesen_US
dc.creatorSohi, Harkiraten_US
dc.creatorHaggard, Darylen_US
dc.creatorKimball, Amyen_US
dc.creatorBarentine, Johnen_US
dc.creatorBrewington, Howarden_US
dc.creatorHarvanek, Mikeen_US
dc.creatorKleinman, Scotten_US
dc.creatorKrzesinski, Jureken_US
dc.creatorLong, Danen_US
dc.creatorNitta, Atsukoen_US
dc.creatorSnedden, Stephanieen_US
dc.creatorLee, Brianen_US
dc.creatorHarris, Hughen_US
dc.creatorBrinkmann, Jonathanen_US
dc.creatorSchneider, Donald P.en_US
dc.creatorYork, Donald G.en_US
dc.date.accessioned2016-04-28T19:35:26Z
dc.date.available2016-04-28T19:35:26Z
dc.date.issued2008-09en
dc.description.abstractUsing effective temperature and metallicity derived from SDSS spectra for similar to 60,000 F- and G-type main-sequence stars (0.2 < g - r < 0.6), we develop polynomial models for estimating these parameters from the SDSS u - g and g - r colors. These photometric estimates have similar error properties as those determined from SDSS spectra. We apply this method to SDSS photometric data for over 2 million F/G stars and measure the unbiased metallicity distribution for a complete volume-limited sample of stars at distances between 500 pc and 8 kpc. The metallicity distribution can be exquisitely modeled using two components with a spatially varying number ratio, which correspond to disk and halo. The two components also possess the kinematics expected for disk and halo stars. The metallicity of the halo component is spatially invariant, while the median disk metallicity smoothly decreases with distance from the Galactic plane from -0.6 at 500 pc to -0.8 beyond several kiloparsecs. The absence of a correlation between metallicity and kinematics for disk stars is in a conflict with the traditional decomposition in terms of thin and thick disks. We detect coherent substructures in the kinematics-metallicity space, such as the Monoceros stream, which rotates faster than the LSR, and has a median metallicity of [Fe/H] = -0.95, with an rms scatter of only similar to 0.15 dex. We extrapolate our results to the performance expected from the Large Synoptic Survey Telescope (LSST) and estimate that LSST will obtain metallicity measurements accurate to 0.2 dex or better, with proper-motion measurements accurate to similar to 0.5 mas yr(-1), for about 200 million F/G dwarf stars within a distance limit of similar to 100 kpc (g < 23.5).en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipNSF AST 61-5991, AST 07-0901, AST 05-51161, PHY-053584, AST 02-38683, AST 04-06784, AST 07-07776en_US
dc.description.sponsorshipNASA NAG5-13057, NAG5-13147en_US
dc.identifierdoi:10.15781/T21J7J
dc.identifier.Filename2008_09_milkyway.pdfen_US
dc.identifier.citationIvezi?, ﾎeljko, Branimir Sesar, Mario Juri?, Nicholas Bond, Julianne Dalcanton, Constance M. Rockosi, Brian Yanny et al. "The Milky Way Tomography with SDSS. II. Stellar Metallicity." The Astrophysical Journal, Vol. 684, No. 1 (Sep., 2008): 287.en_US
dc.identifier.doi10.1086/589678en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34834
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxy : haloen_US
dc.subjectgalaxy : kinematics and dynamicsen_US
dc.subjectgalaxy : stellaren_US
dc.subjectcontenten_US
dc.subjectgalaxy : structureen_US
dc.subjectmethods : data analysisen_US
dc.subjectstars : statisticsen_US
dc.subjectdigital sky surveyen_US
dc.subjectspectroscopic target selectionen_US
dc.subjectdark-matteren_US
dc.subjectuniverseen_US
dc.subjectmetal-poor starsen_US
dc.subjectgalactic latitude structuresen_US
dc.subjectsurveyen_US
dc.subjectphotometric systemen_US
dc.subjectsynoptic survey telescopeen_US
dc.subjectsurvey commissioningen_US
dc.subjectdataen_US
dc.subjectradial-velocity surveyen_US
dc.subjectmain-sequence starsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Milky Way Tomography With SDSS. II. Stellar Metallicityen_US
dc.typeReviewen_US

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