Horta, D, Schiavon, RP and Apogee Team, (2024) Chemically characterising the Milky Way’s stellar halo. In: Proceedings of the International Astronomical Union , 18 (S377). pp. 93-97. (Symposium 377 International Astronomical Union Early Disk Galaxy Formation: From JWST to the Milky Way February, 6th Feb - 10 Feb 2023, Kuala Lumpur, Malaysia).

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Abstract

Galactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalised dwarf galaxies. The chemo-dynamical information recorded in their stellar populations helps elucidate their nature, constraining the assembly history of the Galaxy. Using data from APOGEE and Gaia, we examine the chemical properties of various halo substructures, considering elements that sample various nucleosynthetic pathways. The systems studied are Heracles, Gaia-Enceladus/Sausage (GES), the Helmi stream, Sequoia, Thamnos, Aleph, LMS1, Arjuna, I’itoi, Nyx, Icarus, and Pontus. Abundance patterns of all substructures are cross-compared in a statistically robust fashion. Our results show that many halo substructures conjectured to be debris from individual accretions likely belong to either the omnipresent GES or to in situ populations, and that the Milky Way likely underwent three major mergers so far: Heracles, GES, Sagittarius dSph.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	0201 Astronomical and Space Sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Cambridge University Press (CUP)
SWORD Depositor:	A Symplectic
Date Deposited:	07 Oct 2024 15:01
Last Modified:	07 Oct 2024 15:01
DOI or ID number:	10.1017/s1743921323002910
URI:	https://researchonline.ljmu.ac.uk/id/eprint/24436

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