Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 891, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ab78a4
Keywords
Milky Way dynamics; Milky Way formation; Hydrodynamical simulations; Milky Way evolution
Categories
Funding
- National Key Basic Research and Development Program of China [2018YFA0404501]
- NSFC [11673083]
- World Academy of Sciences
- Chinese Academy of Sciences
- STFC Consolidated grant [ST/R000786/1]
- BIS National E-infrastructure capital grant [ST/J005673/1]
- STFC capital grant [ST/H008586/1]
- STFC DiRAC Operations grant [ST/K00333X/1]
- STFC [ST/M007618/1, ST/R001049/1, ST/J005673/1, ST/P000673/1, ST/P002447/1, ST/M006530/1, ST/T00049X/1, ST/V002635/1, ST/R000832/1, ST/K00333X/1, ST/R00689X/1, ST/T001372/1, ST/M007065/1, ST/M007006/1, ST/S003762/1, ST/R001006/1, ST/S003916/1, ST/M007073/1, ST/M006948/1, ST/V002376/1, ST/V002384/1, ST/P003400/1, ST/R001014/1, ST/T001550/1, ST/L000636/1, ST/T001348/1, ST/T001569/1] Funding Source: UKRI
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The Milky Way's progenitor experienced several merger events that left their imprints on the stellar halo, including the Gaia-Sausage/Enceladus. Recently, it has been proposed that this event perturbed the proto-disk and gave rise to a metal-rich ([Fe/H] > -1), low angular momentum (v < 100 km s(-1)) stellar population. These stars have dynamical and chemical properties different from the accreted stellar halo, but are continuous with the canonical thick disk. In this Letter, we use a hydrodynamical simulation of an isolated galaxy that develops clumps that produce a bimodal thin+thick disk chemistry to explore whether it forms such a population. We demonstrate that clump scattering forms a metal-rich, low angular momentum population, without the need for a major merger. We show that, in the simulation, these stars have chemistry, kinematics, and density distribution in good agreement with those in the Milky Way.
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