Direct N-body simulations of the Milky Way and Andromeda show merger timing is very sensitive to Andromeda's tangential velocity and halo size, with the central black holes stalling near 50 parsecs separation at current resolution.
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The collision between the Milky Way and Andromeda and the fate of their Supermassive Black Holes
Direct N-body simulations of the Milky Way and Andromeda show merger timing is very sensitive to Andromeda's tangential velocity and halo size, with the central black holes stalling near 50 parsecs separation at current resolution.