Fitting a two-infall chemical evolution model to SDSS Milky Way Mapper stars yields a second accretion peak around 4.1 Gyr after the Galaxy formed, roughly 10 Gyr ago.
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Reconstructing the Milky Way chemical map with Galactic Chemical Evolution tool OMEGA+ from SDSS-MWM
Fitting a two-infall chemical evolution model to SDSS Milky Way Mapper stars yields a second accretion peak around 4.1 Gyr after the Galaxy formed, roughly 10 Gyr ago.