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

Horta, D., Schiavon, R. P., Mackereth, J. T., Pfeffer, J., Mason, A. C., Kisku, S., et al. (2020). Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy. Monthly Notices of the Royal Astronomical Society, 500(1), 1385-1403. doi:10.1093/mnras/staa2987.

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Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy.pdf (Any fulltext), 4MB
 
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Horta, Danny, Author
Schiavon, Ricardo P., Author
Mackereth, J. Ted, Author
Pfeffer, Joel, Author
Mason, Andrew C., Author
Kisku, Shobhit, Author
Fragkoudi, Francesca1, Author              
Prieto, Carlos Allende, Author
Cunha, Katia, Author
Hasselquist, Sten, Author
Holtzman, Jon, Author
Majewski, Steven R., Author
Nataf, David, Author
O’Connell, Robert W., Author
Schultheis, Mathias, Author
Smith, Verne V., Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We report evidence from APOGEE for the presence of a new metal-poor stellar structure located within ∼4 kpc of the Galactic Centre. Characterized 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 ∼5 × 108 M, or approximately twice the mass of the recently discovered Gaia-Enceladus/Sausage system. We find that the accreted: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.

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 Dates: 2020-11-20
 Publication Status: Published online
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa2987
Other: LOCALID: 3283759
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 500 (1) Sequence Number: - Start / End Page: 1385 - 1403 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150