"Listening" To Cluster Cooling Flows: Radio Emission and the Cluster\n Environment

The radio continuum properties of galaxy clusters with cooling flows are\nreviewed along with the relationship to the X-ray environment. We find that\n60-70% of cD galaxies in cooling flows are radio-loud, a much higher fraction\nthan the 14% found for typical cluster ellipticals. New ROSAT HRI observations\nreveal a variety of interesting correlations and anticorrelations between the\nX-ray structure within the inner cooling flows and the radio morphologies. It\nappears that the radio plasma can have a strong effect on the inner structure\nof cluster cooling cores as virtually all cooling flow clusters with central\nradio sources have non-symmetric X-ray structure. Numerical simulations of\nradio jets in cooling flow atmospheres are presented. We also discuss the\nprospects for destroying cooling flows via cluster-cluster mergers, using new\nhydro/N-body simulations which incorporate radiative cooling.\n