Chandra ACIS-S Observations of Abell 4059: Signs of Dramatic Interaction   Between a Radio Galaxy and a Galaxy Cluster
  We present Chandra observations of the galaxy cluster A4059. We find strong evidence that the FR-I radio galaxy PKS 2354-35 at the center of A4059 is inflating cavities with radii ~20 kpc in the intracluster medium, similar to the situation seen in Perseus A and Hydra A. We also find evidence for interaction between the intracluster medium and PKS 2354-35 on small scales in the very center of the cluster. Arguments are presented suggesting that this radio galaxy has faded significantly in radio power (possibly from an FR-II state) over the past 10^8 yrs. 
Sebastian Heinz, Yun-Young Choi, Christopher S. Reynolds, Mitchell C.   Begelman