Amplification of magnetic fields in the centers of cluster cooling flows.
In 1990, Soker & Sarazin predicted that cooling Nows in clusters of galaxies would compress ambient intracluster magnetic Delds until the magnetic pressure becomes comparable to the local thermal pressure. Strong, centrally enhanced magnetic Delds were subsequently detected through Faraday rotation measurements of cooling-Now clusters. This compression of the magnetic Deld is one of the strongest circumstantial indicators of now in cluster cooling nows. We present two additional mechanisms by which rotating cooling Nows can generate strong, centrally enhanced magnetic Delds : through the twisting of magnetic Nux tubes and/or the operation of a fast a-u dynamo. This will lead to strong, and possibly violent, magnetic activity in the inner D10 kpc of cooling-Now clusters. Such magnetic activity, e.g., reconnection, can generate turbulence, heat, and relativistic particles, which can power the optical laments that are observed within this spatial scale in many cooling Nows and can form di use radio emission in the same region.
|Main Author:||Godon, Patrick.|
|Other Authors:||Soker, Noam., White, Raymond III.|