  Cluster galaxies moving through the intracluster medium (ICM) are expected to
lose some of their interstellar medium (ISM) through ram pressure stripping and
related ISM-ICM interactions. Using high-resolution cosmological simulations of
a large galaxy cluster including star formation, we show that the ram pressure
a galaxy experiences at a fixed distance from the cluster center can vary by
well over an order of magnitude We find that this variation in ram pressure is
due in almost equal parts to variation in the ICM density and in the relative
velocity between the galaxy and the ICM. We also find that the ICM and galaxy
velocities are weakly correlated for in-falling galaxies.
