Satellite collisions can form bars in MW/M31-like galaxies, favoring moderate velocity, high inclination, off-center impacts, and intruder masses above about 3e9 solar masses.
R., Gough-Kelly, S., Debattista, V
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N-body simulations of galaxy bars generated by satellite collisions: effects of the impact geometry
Satellite collisions can form bars in MW/M31-like galaxies, favoring moderate velocity, high inclination, off-center impacts, and intruder masses above about 3e9 solar masses.