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Deep wide-field H$\alpha$+[NII] imaging around the Virgo cluster giantelliptical galaxy M86 reveals a highly complex and disturbed ISM/ICM. The moststriking feature is a set of H$\alpha$ filaments which clearly connect M86 withthe nearby disturbed spiral NGC 4438 (23$'$=120 kpc projected away), providingstrong evidence for a previously unrecognized collision between them.Spectroscopy of selected regions show a fairly smooth velocity gradient betweenM86 and NGC 4438, consistent with the collision scenario. Such a collisionwould impart significant energy into the ISM of M86, probably heating the gasand acting to prevent the gas from cooling to form stars. We propose that coolgas stripped from NGC 4438 during the collision and deposited in its wake isheated by shocks, ram pressure drag, or thermal conduction, producing most ofthe H$\alpha$ filaments. Some H$\alpha$ filaments are associated with thewell-known ridge of bright X-ray emission to the NW of the nucleus, suggestingthat the collision is responsible for peculiarities of M86 previously ascribedto other effects. M86 is radio-quiet, thus AGN heating is unlikely to play asignificant role. The M86 system has implications for understanding the role ofgravitational interactions in the heating of the ISM in ellipticals, and howcollisions in clusters transform galaxies.

astrophysical journal/the astrophysical journal

A Spectacular H$\alpha$ Complex in Virgo: Evidence for a Collision  Between M86 and NGC 4438 and Implications for Collisional ISM Heating of  Ellipticals