The assembly history of the Galactic inner halo inferred from α-element patterns

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dc.contributor.authorFernandez-Alvar, Emma
dc.contributor.authorTissera, Patricia B.
dc.contributor.authorCarigi, Leticia
dc.contributor.authorSchuster, William J.
dc.contributor.authorBeers, Timothy C.
dc.contributor.authorBelokurov, Vasily A.
dc.date.accessioned2023-06-19T14:52:44Z
dc.date.available2023-06-19T14:52:44Z
dc.date.issued2019-02-15
dc.descriptionIndexación Scopuses
dc.description.abstractWe explore the origin of the observed decline in [O/Fe] (and [Mg/Fe]) with Galactocentric distance for high-metallicity stars ([Fe/H] > −1.1), based on a sample of halo stars selected within the Apache Point Observatory Galactic Evolution Experiment (APOGEE) fourteenth data release (DR14). We also analyse the characteristics of the [α/Fe] distributions in the inner-halo regions inferred from two zoom-in Milky Way mass-sized galaxies that are taken as case studies. One of them qualitatively reproduces the observed trend to have higher fraction of α-rich star for decreasing galactocentric distance; the other exhibits the opposite trend. We find that stars with [Fe/H] > −1.1 located in the range [15–30] kpc are consistent with formation in two starbursts, with maxima separated by about ∼1 Gyr. We explore the contributions of stellar populations with different origin to the [α/Fe] gradients detected in stars with [Fe/H] > −1.1. Our analysis reveals that the simulated halo that best matches the observed chemical trends is characterized by an accretion history involving low-to intermediate-mass satellite galaxies with a short and intense burst of star formation, and contributions from a more massive satellite with dynamical masses about ∼1010 M, distributing low [α/Fe] stars at intermediate radius.es
dc.identifier.citationMonthly Notices of the Royal Astronomical Society Volume 485, Issue 2, Pages 1745 - 1756 15 February 2019es
dc.identifier.doi10.1093/mnras/stz443en
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/50804
dc.language.isoenes
dc.publisherMonthly Notices of the Royal Astronomical Societyes
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectGalaxy: abundanceses
dc.subjectGalaxy: formationes
dc.subjectGalaxy: haloes
dc.subjectMethods: numericales
dc.subjectTechniques: spectroscopices
dc.titleThe assembly history of the Galactic inner halo inferred from α-element patternses
dc.typeArtículoes
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