About: Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy

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About: Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy Goto Sponge NotDistinct Permalink

An Entity of Type : schema:ScholarlyArticle, within Data Space : covidontheweb.inria.fr associated with source document(s)

Attributes	Values
type	Academic Article research paper schema:ScholarlyArticle
isDefinedBy	Covid-on-the-Web dataset
title	Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy
Creator	Mason, Andrew O'connell, Robert Cunha, Katia Fragkoudi, Francesca Hasselquist, Sten Holtzman, Jon Horta, Danny Kisku, Shobhit Mackereth, J Majewski, Steven Nataf, David Pfeffer, Joel Prieto, Carlos Schiavon, Ricardo Schultheis, Mathias Smith, Verne
source	ArXiv
abstract	We report evidence from APOGEE for the presence of a new metal-poor stellar structure located within $/sim$4~kpc of the Galactic centre. Characterised by a chemical composition resembling those of low mass satellites of the Milky Way, this new inner Galaxy structure (IGS) seems to be chemically and dynamically detached from more metal-rich populations in the inner Galaxy. We conjecture that this structure is associated with an accretion event that likely occurred in the early life of the Milky Way. Comparing the mean elemental abundances of this structure with predictions from cosmological numerical simulations, we estimate that the progenitor system had a stellar mass of $/sim5/times10^8M_/odot$, or approximately twice the mass of the recently discovered Gaia-Enceladus/Sausage system. We find that the accreted:{/it in situ} ratio within our metal-poor ([Fe/H]$<$--0.8) bulge sample is somewhere between 1:3 and 1:2, confirming predictions of cosmological numerical simulations by various groups.
has issue date	2020-07-20(xsd:dateTime)
has license	arxiv
sha1sum (hex)	355d720537bd58e5d35e3b186e602f4288f33870
resource representing a document's title	Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy
resource representing a document's body	covid:355d720537bd58e5d35e3b186e602f4288f33870#body_text
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