Metallicity and alpha-element abundance gradients along the Sagittarius Stream as seen by APOGEE
Author | dc.contributor.author | Hayes, Christian | |
Author | dc.contributor.author | Majewski, Steven | |
Author | dc.contributor.author | Hasselquist, Sten | |
Author | dc.contributor.author | Anguiano, Borja | |
Author | dc.contributor.author | Shetrone, Matthew | |
Author | dc.contributor.author | Law, David | |
Author | dc.contributor.author | Schiavon, Ricardo | |
Author | dc.contributor.author | Cunha, Katia | |
Author | dc.contributor.author | Smith, Verne | |
Author | dc.contributor.author | Beaton, Rachael | |
Author | dc.contributor.author | Price Whelan, Adrián | |
Author | dc.contributor.author | Allende Prieto, Carlos | |
Author | dc.contributor.author | Battaglia, Giuseppina | |
Author | dc.contributor.author | Bizyaev, Dimitry | |
Author | dc.contributor.author | Brownstein, Joel | |
Author | dc.contributor.author | Cohen, Roger | |
Author | dc.contributor.author | Frinchaboy, Peter | |
Author | dc.contributor.author | García Hernández, D. A. | |
Author | dc.contributor.author | Lacerna, Iván | |
Author | dc.contributor.author | Lane, Richard | |
Author | dc.contributor.author | Meszaros, Szabolcs | |
Author | dc.contributor.author | Moni Bidin, Christian | |
Author | dc.contributor.author | Muñoz Vidal, Ricardo | |
Author | dc.contributor.author | Nidever, David | |
Author | dc.contributor.author | Oravetz, Audrey | |
Author | dc.contributor.author | Oravetz, Daniel | |
Author | dc.contributor.author | Pan, Kaike | |
Author | dc.contributor.author | Román Lopes, Alexandre | |
Author | dc.contributor.author | Sobeck, Jennifer | |
Author | dc.contributor.author | Stringfellow, Guy | |
Admission date | dc.date.accessioned | 2020-05-07T22:26:14Z | |
Available date | dc.date.available | 2020-05-07T22:26:14Z | |
Publication date | dc.date.issued | 2020 | |
Cita de ítem | dc.identifier.citation | Astrophysical Journal (2020) 889:artículo 63 | es_ES |
Identifier | dc.identifier.other | 10.3847/1538-4357/ab62ad | |
Identifier | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/174528 | |
Abstract | dc.description.abstract | Using 3D positions and kinematics of stars relative to the Sagittarius (Sgr) orbital plane and angular momentum, we identify 166 Sgr stream members observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) that also have Gaia DR2 astrometry. This sample of 63/103 stars in the Sgr trailing/leading arm is combined with an APOGEE sample of 710 members of the Sgr dwarf spheroidal core (385 of them newly presented here) to establish differences of 0.6 dex in median metallicity and 0.1 dex in [alpha/Fe] between our Sgr core and dynamically older stream samples. Mild chemical gradients are found internally along each arm, but these steepen when anchored by core stars. With a model of Sgr tidal disruption providing estimated dynamical ages (i.e., stripping times) for each stream star, we find a mean metallicity gradient of 0.12 0.03 dex Gyr(-1) for stars stripped from Sgr over time. For the first time, an [alpha/Fe] gradient is also measured within the stream, at 0.02 0.01 dex Gyr(-1) using magnesium abundances and at 0.04 0.01 dex Gyr(-1) using silicon, which imply that the Sgr progenitor had significant radial abundance gradients. We discuss the magnitude of those inferred gradients and their implication for the nature of the Sgr progenitor within the context of the current family of Milky Way satellite galaxies, and we suggest that more sophisticated Sgr models are needed to properly interpret the growing chemodynamical detail we have on the Sgr system. | es_ES |
Patrocinador | dc.description.sponsorship | National Science Foundation (NSF) DGE-1315231 National Science Foundation (NSF) AST-1616636 National Science Foundation (NSF) AST-1801940 National Aeronautics & Space Administration (NASA) 51386.01 Space Telescope Science Institute Spanish MINECO AYA2017-86389 grant (AEI/FEDER, UE) AYA2017-89076-P MCIU Ramon y Cajal Fellowship RYC-2012-11537 Ministerio de Ciencia, Innovacion y Universidades (MCIU), through the State Budget Consejeria de Economia, Industria, Comercio y Conocimiento of the Canary Islands Autonomous Community National Aeronautics & Space Administration (NASA) NAS 5-26555 Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation PHY 14-30152 Leverhulme Trust National Science Foundation (NSF) AST-1715662 State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU) European Union (EU) AYA2017-88254-P Premium Postdoctoral Research Program of the Hungarian Academy of Sciences Hungarian Academy of Sciences Hungarian NKFI grants of the Hungarian National Research, Development and Innovation Office K-119517 GINOP-2.3.2-152016-00003 Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT PIA/BASAL AFB-170002 Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 1170364 Alfred P. Sloan Foundation United States Department of Energy (DOE) Brazilian Participation Group Carnegie Institution for Science Carnegie Mellon University Chilean Participation Group French Participation Group Smithsonian Institution Harvard-Smithsonian Center for Astrophysics Instituto de Astrofisica de Canarias Johns Hopkins University Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo Korean Participation Group United States Department of Energy (DOE) Leibniz Institut fur Astrophysik Potsdam (AIP) Max-Planck-Institut fur Astronomie (MPIA Heidelberg) Max-Planck-Institut fur Astrophysik (MPA Garching) Max-Planck-Institut fur Extraterrestrische Physik (MPE) National Astronomical Observatories of China New Mexico State University New York University University of Notre Dame Observatario Nacional/MCTI Ohio State University Pennsylvania State University Shanghai Astronomical Observatory United Kingdom Participation Group Universidad Nacional Autonoma de Mexico University of Arizona University of Colorado Boulder University of Oxford University of Portsmouth University of Utah University of Virginia University of Washington University of Wisconsin Vanderbilt University Yale University | es_ES |
Lenguage | dc.language.iso | en | es_ES |
Publisher | dc.publisher | IOP | es_ES |
Type of license | dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Chile | * |
Source | dc.source | Astrophysical Journal | es_ES |
Keywords | dc.subject | Sagittarius dwarf spheroidal galaxy | es_ES |
Keywords | dc.subject | Milky Way stellar halo | es_ES |
Keywords | dc.subject | Chemical abundances | es_ES |
Keywords | dc.subject | Galaxy evolution | es_ES |
Keywords | dc.subject | Tidal tails | es_ES |
Keywords | dc.subject | Galaxy chemical evolution | es_ES |
Keywords | dc.subject | Galaxy abundances | es_ES |
Keywords | dc.subject | Stellar kinematics | es_ES |
Keywords | dc.subject | Stellar abundances | es_ES |
Keywords | dc.subject | Dwarf galaxies | es_ES |
Título | dc.title | Metallicity and alpha-element abundance gradients along the Sagittarius Stream as seen by APOGEE | es_ES |
Document type | dc.type | Artículo de revista | es_ES |
dcterms.accessRights | dcterms.accessRights | Acceso a solo metadatos | es_ES |
Cataloguer | uchile.catalogador | apc | es_ES |
Indexation | uchile.index | Artículo de publicación ISI | |
Indexation | uchile.index | Artículo de publicación SCOPUS |
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