Does the dwarf galaxy system of the Milky Way originate from Andromeda?
Sylvain Fouquet, Fran\c{c}ois Hammer, Yanbin Yang, Mathieu Puech and, Hector Flores

TL;DR
This study suggests that the Milky Way's dwarf galaxy system, including the Magellanic Clouds, may originate from a tidal tail produced by an ancient major merger in Andromeda, explaining several observed structures in the Local Group.
Contribution
It provides a novel scenario linking the origin of the Milky Way's dwarf satellites to tidal debris from a past merger in Andromeda, supported by hydrodynamical simulations.
Findings
The tidal tail's location coincides with the Milky Way's position.
The tail's velocity matches the Magellanic Clouds' proper motion.
A tidal dwarf galaxy similar to the LMC is formed in the simulation.
Abstract
The Local Group is often seen to be a quiescent environment without significant merger events. However an ancient major merger may have occurred in the most massive galaxy. Numerical simulations have shown that tidal tails formed during gas-rich major mergers are long-lived and could be responsible for old stellar streams and likely induce the formation of tidal dwarf galaxies (TDGs). Using several hydrodynamical simulations we have investigated the most prominent tidal tail formed during the first passage, which is gas-rich and contains old and metal poor stars. We discovered several striking coincidences after comparing its location and motion to those of the Milky Way (MW) and of the Magellanic Clouds (MCs). First, the tidal tail is sweeping a relatively small volume in which the MW precisely lies. Because the geometry of the merger is somehow fixed by the anisotropic properties of…
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