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We report on the discovery of strong tidal features around a dwarf spheroidalgalaxy in the Hydra I galaxy cluster, indicating its ongoing tidal disruption.This very low surface brightness object, HCC-087, was originally classified asan early-type dwarf in the Hydra Cluster Catalogue (HCC), but our re-analysisof the ESO-VLT/FORS images of the HCC unearthed a clear indication of anS-shaped morphology and a large spatial extent. Its shape, luminosity(M_V=-11.6 mag), and physical size (at a half-light radius of 3.1 kpc and afull length of ~5.9 kpc) are comparable to the recently discovered NGC 4449Band the Sagittarius dwarf spheroidal, all of which are undergoing clear tidaldisruption. Aided by N-body simulations we argue that HCC-087 is currently atits first apocenter, at 150 kpc, around the cluster center and that it is beingtidally disrupted by the galaxy cluster's potential itself. An interaction withthe near-by (50 kpc) S0 cluster galaxy HCC-005, at M* ~ 3 x 10^10 M_sun israther unlikely, as this constellation requires a significant amount ofdynamical friction and thus low relative velocities. The S-shaped morphologyand large spatial extent of the satellite would, however, also appear ifHCC-087 would orbit the cluster center. These features appear to becharacteristic properties of satellites that are seen in the process of beingtidally disrupted, independent of the environment of the destruction. Animportant finding of our simulations is an orientation of the tidal tailsperpendicular to the orbit.

Threshing in Action - The tidal disruption of a dwarf galaxy by the Hydra I Cluster