Slow stellar halo rotation as a signature of disc flips and GES-like mergers

Kirill Batrakov, Alis J. Deason, Francesca Fragkoudi +3

The stellar halo of the Milky Way (MW) exhibits a weak net prograde rotational signal ($v_{\varphi }\lesssim 25$ km~s${}^{-1}$), yet its origin remains unexplained. To investigate this, we u…