The Milky Way Tomography with SDSS: II. Stellar Metallicity

Simple item page
dc.creatorIvezic, Zeljko
dc.creatorSesar, Branimir
dc.creatorJuric, Mario
dc.creatorBond, Nicholas
dc.creatorDalcanton, Julianne
dc.creatorRockosi, Constance M.
dc.creatorYanny, Brian
dc.creatorNewberg, Heidi J.
dc.creatorBeers, Timothy C.
dc.creatorPrieto, Carlos Allende
dc.creatorWilhelm, Ron
dc.creatorLee, Young Sun
dc.creatorSivarani, Thirupathi
dc.creatorNorris, John E.
dc.creatorBailer-Jones, Coryn A. L.
dc.creatorFiorentin, Paola Re
dc.creatorSchlegel, David
dc.creatorUomoto, Alan
dc.creatorLupton, Robert H.
dc.creatorKnapp, Gillian R.
dc.creatorGunn, James E.
dc.creatorCovey, Kevin R.
dc.creatorSmith, J. Allyn
dc.creatorMiknaitis, Gajus
dc.creatorDoi, Mamoru
dc.creatorTanaka, Masayuki
dc.creatorFukugita, Masataka
dc.creatorKent, Steve
dc.creatorFinkbeiner, Douglas
dc.creatorMunn, Jeffrey A.
dc.creatorPier, Jeffrey R.
dc.creatorQuinn, Tom
dc.creatorHawley, Suzanne
dc.creatorAnderson, Scott
dc.creatorKiuchi, Furea
dc.creatorChen, Alex
dc.creatorBushong, James
dc.creatorSohi, Harkirat
dc.creatorHaggard, Daryl
dc.creatorKimball, Amy
dc.creatorBarentine, John
dc.creatorBrewington, Howard
dc.creatorHarvanek, Mike
dc.creatorKleinman, Scott
dc.creatorKrzesinski, Jurek
dc.creatorLong, Dan
dc.creatorNitta, Atsuko
dc.creatorSnedden, Stephanie
dc.creatorLee, Brian
dc.creatorHarris, Hugh
dc.creatorBrinkmann, Jonathan
dc.creatorSchneider, Donald P.
dc.creatorYork, Donald G.
dc.date2008-04-24
dc.date2008-04-24
dc.date.accessioned2026-07-07T12:14:26Z
dc.date.available2026-07-07T12:14:26Z
dc.descriptionUsing effective temperature and metallicity derived from SDSS spectra for ~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. We apply this method to SDSS photometric data for about 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, that 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 kpc. 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]=-0.96, with an rms scatter of only ~0.15 dex. We extrapolate our results to the performance expected from the Large Synoptic Survey Telescope (LSST) and estimate that the LSST will obtain metallicity measurements accurate to 0.2 dex or better, with proper motion measurements accurate to ~0.2 mas/yr, for about 200 million F/G dwarf stars within a distance limit of ~100 kpc (g<23.5). [abridged]
dc.description40 pages, 21 figures, emulateApJ style, accepted to ApJ, high resolution figures are available from http://www.astro.washington.edu/ivezic/sdss/mw/astroph0804.3850
dc.identifierhttps://arxiv.org/abs/0804.3850
dc.identifierhttp://arxiv.org/abs/0804.3850
dc.identifierAstrophys.J.684:287-325,2008
dc.identifierdoi:10.1086/589678
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211190
dc.subjectAstrophysics
dc.titleThe Milky Way Tomography with SDSS: II. Stellar Metallicity
dc.typetext

Files

Collections

arXiv