AGN FEEDBACK IN GALAXY GROUPS: THE CASE OF HCG 62

As a part of an ongoing study of a sample of galaxy groups showing evidence for AGN/hot gas interaction, we report on the preliminary results of an analysis of Chandra, XMM-Newton and new GMRT data of the X-ray bright compact group HCG 62. This is one of the few groups known to possess very clear, small X-ray cavities in the inner region as shown by the existing Chandra image. At higher frequency (1.4 GHz) the cavities show minimal if any radio emission, but the radio appears clearly at lower frequencies (<= 610 MHz). We find that the radio source is radiatively inefficient, with a ratio of mechanical cavity power to radio luminosity of similar to 10(4), and that the jets have hadronic content. We also identify a shock front located around 35 kpc to the south-west of the group center. Such a shock may have significantly heated the gas close to the southern cavity, as indicated by the temperature map.