Disk-like Chemistry of the Triangulum-Andromeda Overdensity as Seen by APOGEE

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dc.contributor.authorHayes, Christian R.
dc.contributor.authorMajewski, Steven R.
dc.contributor.authorHasselquist, Sten
dc.contributor.authorBeaton, Rachael L.
dc.contributor.authorCunha, Katia
dc.contributor.authorSmith, Verne V.
dc.contributor.authorPrice Whelan, Adrian M.
dc.contributor.authorAnguiano, Borja
dc.contributor.authorBeers, Timothy C.
dc.contributor.authorCarrera, Ricardo
dc.contributor.authorFernandez Trincado, J. G.
dc.contributor.authorFrinchaboy, Peter M.
dc.contributor.authorGarcia Hernandez, D. A.
dc.contributor.authorLane, Richard R.
dc.contributor.authorNidever, David L.
dc.contributor.authorNitschelm, Christian
dc.contributor.authorRoman Lopes, Alexandre
dc.contributor.authorZamora, Olga
dc.date.accessioned2024-01-10T13:47:39Z
dc.date.available2024-01-10T13:47:39Z
dc.date.issued2018
dc.description.abstractThe nature of the Triangulum-Andromeda (TriAnd) system has been debated since the discovery of this distant, low-latitude Milky Way (MW) overdensity more than a decade ago. Explanations for its origin are either as a halo substructure from the disruption of a dwarf galaxy, or a distant extension of the Galactic disk. We test these hypotheses using the chemical abundances of a dozen TriAnd members from the Sloan Digital Sky Survey-IV's (SDSS-IV's) 14th Data Release (DR14) of Apache Point Observatory Galactic Evolution Experiment (APOGEE) data to compare to APOGEE abundances of stars with similar metallicity from both the Sagittarius (Sgr) dSph and the outer MW disk. We find that TriAnd stars are chemically distinct from Sgr across a variety of elements, (C+N), Mg, K, Ca, Mn, and Ni, with a separation in [X/Fe] of about 0.1 to 0.4 dex depending on the element. Instead, the TriAnd stars, with a median metallicity of about -0.8, exhibit chemical abundance ratios similar to those of the lowest metallicity ([Fe/H] similar to-0.7)stars in the outer Galactic disk, and are consistent with expectations of extrapolated chemical gradients in the outer disk of the MW. These results suggest that TriAnd is associated with the MW disk, and, therefore, that the disk extends to this overdensity-i.e., past a Galactocentric radius of 24 kpc -albeit vertically perturbed about 7 kpc below the nominal disk midplane in this region of the Galaxy.
dc.description.funderNSF
dc.description.funderNASA by the Space Telescope Science Institute
dc.description.funderFONDECYT
dc.description.funderSpanish Ministry of Economy and Competitiveness (MINECO)
dc.description.funderPhysics Frontier Center/JINA-CEE - U.S. National Science Foundation
dc.description.funderAlfred P. Sloan Foundation
dc.description.funderU.S. Department of Energy Office of Science
dc.description.funderCenter for High-Performance Computing at the University of Utah
dc.description.funderBrazilian Participation Group
dc.description.funderCarnegie Institution for Science, Carnegie Mellon University
dc.description.funderChilean Participation Group
dc.description.funderFrench Participation Group
dc.description.funderHarvard-Smithsonian Center for Astrophysics
dc.description.funderInstituto de Astrofisica de Canarias
dc.description.funderJohns Hopkins University
dc.description.funderKavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
dc.description.funderLawrence Berkeley National Laboratory
dc.description.funderLeibniz Institut fur Astrophysik Potsdam (AIP)
dc.description.funderMax-Planck-Institut fur Astronomie (MPIA Heidelberg)
dc.description.funderMax-Planck-Institut fur Astrophysik (MPA Garching)
dc.description.funderMax-Planck-Institut fur Extraterrestrische Physik (MPE)
dc.description.funderNational Astronomical Observatories of China
dc.description.funderNew Mexico State University
dc.description.funderNew York University
dc.description.funderUniversity of Notre Dame
dc.description.funderObservatario Nacional/MCTI
dc.description.funderOhio State University
dc.description.funderPennsylvania State University
dc.description.funderShanghai Astronomical Observatory
dc.description.funderUnited Kingdom Participation Group
dc.description.funderUniversidad Nacional Autonoma de Mexico
dc.description.funderUniversity of Arizona
dc.description.funderUniversity of Colorado Boulder
dc.description.funderUniversity of Oxford
dc.description.funderUniversity of Portsmouth
dc.description.funderUniversity of Utah
dc.description.funderUniversity of Virginia
dc.description.funderUniversity of Washington
dc.description.funderUniversity of Wisconsin
dc.description.funderVanderbilt University
dc.description.funderYale University
dc.description.funderNASA
dc.description.funderDirect For Mathematical & Physical Scien
dc.description.funderDivision Of Astronomical Sciences
dc.description.funderDivision Of Physics
dc.fechaingreso.objetodigital2024-05-30
dc.format.extent7 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3847/2041-8213/aac38c
dc.identifier.eissn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.3847/2041-8213/aac38c
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79290
dc.identifier.wosidWOS:000432868200001
dc.information.autorucFísica; Lane RR;S/I;1021384
dc.issue.numero1
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherIOP PUBLISHING LTD
dc.revistaASTROPHYSICAL JOURNAL LETTERS
dc.rightsacceso restringido
dc.subjectGalaxy: disk
dc.subjectGalaxy: evolution
dc.subjectGalaxy: halo
dc.subjectGalaxy: structure
dc.subjectstars: abundances
dc.subjectDIGITAL SKY SURVEY
dc.subjectMILKY-WAY HALO
dc.subjectGALACTIC DISC
dc.subjectSTARS
dc.subjectABUNDANCES
dc.subjectREGION
dc.subjectMASSES
dc.subjectAGES
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleDisk-like Chemistry of the Triangulum-Andromeda Overdensity as Seen by APOGEE
dc.typeartículo
dc.volumen859
sipa.codpersvinculados1021384
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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