Tracing AGN Outbursts in Clusters Cores using X-ray and Low Frequency Radio Observations
Abstract
X-ray observations of the thermal gas in the central regions of
cooling core clusters have revealed spectacular details of the interactions between the central radio sources and the surrounding thermal intracluster medium. In addition to depressions and filaments associated with the active central radio source, there are a number of cases of 'ghost cavities' in the thermal gas which may trace buoyant lobes from past radio outbursts. The ghost cavities provide details on the lifecycle of the central radio sources as well as their energy input into the ICM. We present a detailed X-ray and multi-frequency radio analysis of the central radio sources in several of these ghost cavity systems. Our new low frequency radio observations allow us to trace multiple cycles of radio outbursts and reveal evidence of radio emission filling X-ray tunnels in both Abell 2597 and Abell 262. Basic research in radio astronomy at the NRL is supported by the Office of Naval Research.- Publication:
-
AAS/High Energy Astrophysics Division #9
- Pub Date:
- September 2006
- Bibcode:
- 2006HEAD....9.1331C