AMPLIFICATION OF MAGNETIC-FIELDS IN THE CENTERS OF CLUSTER COOLING FLOWS

In 1990, Soker & Sarazin predicted that cooling flows in clusters of g alaxies would compress ambient intracluster magnetic fields until the magnetic pressure becomes comparable to the local thermal pressure. St rong, centrally enhanced magnetic fields were subsequently detected th rough Faraday rotation measurements of cooling-flow clusters. This com pression of the magnetic field is one of the strongest circumstantial indicators of ''flow'' in cluster cooling flows. We present two additi onal mechanisms by which rotating cooling flows can generate strong, c entrally enhanced magnetic fields: through the twisting of magnetic fl ux tubes and/or the operation of a fast alpha-omega dynamo. This will lead to strong, and possibly violent, magnetic activity in the inner s imilar to 10 kpc of cooling-flow clusters. Such magnetic activity, e.g ., reconnection, can generate turbulence, heat, and relativistic parti cles, which can power the optical filaments that are observed within t his spatial scale in many cooling flows and can form diffuse radio emi ssion in the same region.