Chemical Cartography With Apogee: Large-Scale Mean Metallicity Maps Of The Milky Way Disk

dc.contributor.utaustinauthorShetrone, Matthew D.en_US
dc.creatorMichael R. Haydenen_US
dc.creatorJon A. Holtzmanen_US
dc.creatorJo Bovyen_US
dc.creatorSteven R. Majewskien_US
dc.creatorJennifer A. Johnsonen_US
dc.creatorCarlos Allende Prietoen_US
dc.creatorTimothy C. Beersen_US
dc.creatorKatia Cunhaen_US
dc.creatorPeter M. Frinchaboyen_US
dc.creatorAna E. García Pérezen_US
dc.creatorLéo Girardien_US
dc.creatorFred R. Heartyen_US
dc.creatorYoung Sun Leeen_US
dc.creatorDavid Nideveren_US
dc.creatorRicardo P. Schiavonen_US
dc.creatorKatharine J. Schlesingeren_US
dc.creatorDonald P. Schneideren_US
dc.creatorMathias Schultheisen_US
dc.creatorMatthew Shetroneen_US
dc.creatorVerne V. Smithen_US
dc.creatorGail Zasowskien_US
dc.creatorDmitry Bizyaeven_US
dc.creatorDiane Feuilleten_US
dc.creatorSten Hasselquisten_US
dc.creatorKaren Kinemuchien_US
dc.creatorElena Malanushenkoen_US
dc.creatorViktor Malanushenkoen_US
dc.creatorRobert O'Connellen_US
dc.creatorKaike Panen_US
dc.creatorKeivan Stassunen_US
dc.description.abstractWe present Galactic mean metallicity maps derived from the first year of the SDSS-III APOGEE experiment. Mean abundances in different zones of projected Galactocentric radius (0 < R < 15 kpc) at a range of heights above the plane (0 < vertical bar z vertical bar < 3 kpc), are derived from a sample of nearly 20,000 giant stars with unprecedented coverage, including stars in the Galactic mid-plane at large distances. We also split the sample into subsamples of stars with low- and high-[alpha/M] abundance ratios. We assess possible biases in deriving the mean abundances, and find that they are likely to be small except in the inner regions of the Galaxy. A negative radial metallicity gradient exists over much of the Galaxy; however, the gradient appears to flatten for R < 6 kpc, in particular near the Galactic mid-plane and for low-[alpha/M] stars. At R > 6 kpc, the gradient flattens as one moves off the plane, and is flatter at all heights for high-[alpha/M] stars than for low-[alpha/M] stars. Alternatively, these gradients can be described as vertical gradients that flatten at larger Galactocentric radius; these vertical gradients are similar for both low- and high-[alpha/M] populations. Stars with higher [alpha/M] appear to have a flatter radial gradient than stars with lower [alpha/M]. This could suggest that the metallicity gradient has grown steeper with time or, alternatively, that gradients are washed out over time by migration of stars.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipAlfred P. Sloan Foundationen_US
dc.description.sponsorshipNational Science Foundationen_US
dc.description.sponsorshipU.S. Department of Energy Office of Scienceen_US
dc.description.sponsorshipUniversity of Arizonaen_US
dc.description.sponsorshipBrazilian Participation Groupen_US
dc.description.sponsorshipBrookhaven National Laboratoryen_US
dc.description.sponsorshipCarnegie Mellon Universityen_US
dc.description.sponsorshipUniversity of Floridaen_US
dc.description.sponsorshipFrench Participation Groupen_US
dc.description.sponsorshipGerman Participation Groupen_US
dc.description.sponsorshipHarvard Universityen_US
dc.description.sponsorshipMichigan State/Notre Dame/JINA Participation Groupen_US
dc.description.sponsorshipJohns Hopkins Universityen_US
dc.description.sponsorshipLawrence Berkeley National Laboratoryen_US
dc.description.sponsorshipMax Planck Institute for Astrophysicsen_US
dc.description.sponsorshipMax Planck Institute for Extraterrestrial Physicsen_US
dc.description.sponsorshipNew Mexico State Universityen_US
dc.description.sponsorshipNew York Universityen_US
dc.description.sponsorshipOhio State Universityen_US
dc.description.sponsorshipPennsylvania State Universityen_US
dc.description.sponsorshipUniversity of Portsmouthen_US
dc.description.sponsorshipPrinceton Universityen_US
dc.description.sponsorshipSpanish Participation Groupen_US
dc.description.sponsorshipUniversity of Tokyoen_US
dc.description.sponsorshipUniversity of Utahen_US
dc.description.sponsorshipVanderbilt Universityen_US
dc.description.sponsorshipUniversity of Virginiaen_US
dc.description.sponsorshipUniversity of Washingtonen_US
dc.description.sponsorshipYale Universityen_US
dc.description.sponsorshipNational Science Foundation AST-1109178, AST-0907873en_US
dc.description.sponsorshipNASA through Hubble Fellowship from the Space Telescope Science Institute HST-HF-51285.01en_US
dc.description.sponsorshipNASA NAS5-26555en_US
dc.description.sponsorshipNSF Astronomy and Astrophysics Postdoctoral Fellowship AST-1203017en_US
dc.description.sponsorshipPhysics Frontier Center/Joint Institute for Nuclear Astrophysics (JINA) PHY 08-22648en_US
dc.description.sponsorshipUS National Science Foundationen_US
dc.description.sponsorshipInstituto de Astrofisica de Canariasen_US
dc.identifier.citationHayden, Michael R., Jon A. Holtzman, Jo Bovy, Steven R. Majewski, Jennifer A. Johnson, Carlos Allende Prieto, Timothy C. Beers et al. >Chemical Cartography with APOGEE: Large-scale Mean Metallicity Maps of the Milky Way Disk.> The Astronomical Journal, 147, no. 5 (May., 2014): 116.en_US
dc.relation.ispartofserialAstronomical 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.subjectgalaxy: abundancesen_US
dc.subjectgalaxy: disken_US
dc.subjectgalaxy: stellar contenten_US
dc.subjectdigital sky surveyen_US
dc.subjectmono-abundance subpopulationsen_US
dc.subjectthick disken_US
dc.subjectgalactic disken_US
dc.subjectdata releaseen_US
dc.subjectspectroscopic surveyen_US
dc.subjectstellar populationsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleChemical Cartography With Apogee: Large-Scale Mean Metallicity Maps Of The Milky Way Disken_US

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