Fast simulations of gas sloshing and cold front formation
  We present a simplified and fast method for simulating minor mergers between
galaxy clusters. Instead of following the evolution of the dark matter halos
directly by the N-body method, we employ a rigid potential approximation for
both clusters. The simulations are run in the rest frame of the more massive
cluster and account for the resulting inertial accelerations in an optimised
way. We test the reliability of this method for studies of minor merger induced
gas sloshing by performing a one-to-one comparison between our simulations and
hydro+N-body ones. We find that the rigid potential approximation reproduces
the sloshing-related features well except for two artefacts: the temperature
just outside the cold fronts is slightly over-predicted, and the outward motion
of the cold fronts is delayed by typically 200 Myr. We discuss reasons for both
artefacts.
