The Origin of the Milky Way's Halo Age Distribution

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dc.contributor.authorCarollo, Daniela
dc.contributor.authorTissera, Patricia B.
dc.contributor.authorBeers, Timothy C.
dc.contributor.authorGudin, Dmitrii
dc.contributor.authorGibson, Brad K.
dc.contributor.authorFreeman, Ken C.
dc.contributor.authorMonachesi, Antonela
dc.date.accessioned2022-08-03T22:21:21Z
dc.date.available2022-08-03T22:21:21Z
dc.date.issued2018-05
dc.descriptionIndexación Scopuses
dc.description.abstractWe present an analysis of the radial age gradients for the stellar halos of five Milky Way (MW) mass-sized systems simulated as part of the Aquarius Project. The halos show a diversity of age trends, reflecting their different assembly histories. Four of the simulated halos possess clear negative age gradients, ranging from approximately -7 to -19 Myr kpc-1, shallower than those determined by recent observational studies of the Milky Way's stellar halo. However, when restricting the analysis to the accreted component alone, all of the stellar halos exhibit a steeper negative age gradient with values ranging from -8 to -32 Myr kpc-1, closer to those observed in the Galaxy. Two of the accretion-dominated simulated halos show a large concentration of old stars in the center, in agreement with the Ancient Chronographic Sphere reported observationally. The stellar halo that best reproduces the current observed characteristics of the age distributions of the Galaxy is that formed principally by the accretion of small satellite galaxies. Our findings suggest that the hierarchical clustering scenario can reproduce the MW's halo age distribution if the stellar halo was assembled from accretion and the disruption of satellite galaxies with dynamical masses less than ∼109.5 M, and a minimal in situ contribution. © 2018. The American Astronomical Society..es
dc.description.urihttps://iopscience-iop-org.recursosbiblioteca.unab.cl/article/10.3847/2041-8213/aac2dc
dc.identifier.citationAstrophysical Journal Letters Volume 859, Issue 120 May 2018 Article number L7es
dc.identifier.doi10.3847/2041-8213/aac2dc
dc.identifier.issn20418205
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/23440
dc.language.isoenes
dc.publisherInstitute of Physics Publishinges
dc.rights.licenseCC BY 4.0
dc.subjectGlobular Clusterses
dc.subjectHaloes
dc.subjectGaiaes
dc.titleThe Origin of the Milky Way's Halo Age Distributiones
dc.typeArtículoes
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