TY  - JOUR
A1  - Perottoni, Hélio D.
A1  - Limberg, Guilherme
A1  - Amarante, João A. S.
A1  - Rossi, Silvia
A1  - Queiroz, Anna B. A.
A1  - Santucci, Rafael M.
A1  - Pérez-Villegas, Angeles
A1  - Chiappini, Cristina
T1  - The unmixed debris of Gaia-Sausage/Enceladus in the form of a pair of halo stellar overdensities
T2  - Astrophysical journal letters
N2  - In the first billion years after its formation, the galaxy underwent several mergers with dwarf satellites of various masses. The debris of Gaia-Sausage/Enceladus (GSE), the galaxy responsible for the last significant merger of the Milky Way, dominates the inner halo and has been suggested to be the progenitor of both the Hercules-Aquila Cloud (HAC) and Virgo Overdensity (VOD). We combine SEGUE, APOGEE, Gaia, and StarHorse distances to characterize the chemodynamical properties and verify the link between HAC, VOD, and GSE. We find that the orbital eccentricity distributions of the stellar overdensities and GSE are comparable. We also find that they have similar, strongly peaked, metallicity distribution functions, reinforcing the hypothesis of common origin. Furthermore, we show that HAC and VOD are indistinguishable from the prototypical GSE population within all chemical-abundance spaces analyzed. All these evidences combined provide a clear demonstration that the GSE merger is the main progenitor of the stellar populations found within these halo overdensities.
Y1  - 2022
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/64321
SN  - 2041-8213
VL  - 936
IS  - 1
PB  - IOP Publishing
CY  - Bristol
ER  -