Hydrodynamical simulations with baryons show earlier galaxy merger times and more spiral-in orbits than dark-matter-only runs, with collision angles 6-10 degrees smaller in the final 2 Gyr.
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Comparing galaxy merger orbits in hydrodynamical simulation and in dark-matter-only simulation
Hydrodynamical simulations with baryons show earlier galaxy merger times and more spiral-in orbits than dark-matter-only runs, with collision angles 6-10 degrees smaller in the final 2 Gyr.