That's so Retro: The Gaia-Sausage-Enceladus Merger Trajectory as the Origin of the Chemical Abundance Bimodality in the Milky Way Disk

James W. Johnson, Diane K. Feuillet, Ana Bonaca +1

The Milky Way (MW) is thought to have experienced a $\sim$3:1 mass-ratio merger event near redshift $z\sim 2$ with a significantly retrograde trajectory. This now-disrupted dwarf ga…