The accretion history of the Milky Way: IV. Hints of recent star formation in Milky Way dwarf spheroidal galaxies

Dwarf spheroidal galaxies are known to be dominated by old stellar populations. This has led to the assumption that their gas-rich progenitors lost their gas during their infall in the Milky Way (MW) halo at distant look-back times. Here, we report a discovery of a tiny but robustly detected populat...

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Published in:Astronomy and astrophysics (Berlin) 2024-11, Vol.691
Main Authors: Yang, Yanbin, Caffau, Elisabetta, Bonifacio, Piercarlo, Hammer, François, Wang, Jianling, Mamon, Gary A.
Format: Article
Language:English
Subjects:
Astrophysics
Physics
Online Access:Get full text
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Summary:Dwarf spheroidal galaxies are known to be dominated by old stellar populations. This has led to the assumption that their gas-rich progenitors lost their gas during their infall in the Milky Way (MW) halo at distant look-back times. Here, we report a discovery of a tiny but robustly detected population of possibly young (∼1 Gyr old) and intermediate-mass (1.8 M⊙ ≤ M 
ISSN:0004-6361
1432-0756
DOI:10.1051/0004-6361/202451233