On the occurrence of galaxy harassment

Abstract

Tidal interactions of galaxies in galaxy clusters have been proposed as one potential explanation of the morphology-density relation at low masses. The efficiency of tidal transformation is expected to depend strongly on the orbit of a galaxy within the cluster halo. The orbit determines both the strength of the cluster's global tidal field and the probability of encounters with other cluster members. Additionally, we investigate the effect of an inclination between the disk of the infalling galaxy and its orbital plane. We also compare our results to observational data. We find that galaxies that entered a cluster from the outskirts are unlikely to be significantly transformed. Closer to the cluster centre, tidal interactions are a more efficient mechanism for producing harassed galaxies. But the inclination of the disk can reduce the mass loss significantly, yet it amplifies the thickening.

arXiv commentAccepted by A&A, 15 pages

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