A Map of Heating in MS0735.6+7421: Direct Evidence for ICM Heating in the Most Energetic AGN Outburst Known
Abstract
We report on preliminary results from an analysis of new, deep Chandra observations of the cluster MS0735.6+7421. This cluster has been observed by Chandra and XMM-Newton pre-viously and found to contain signatures of the most energetic AGN outburst currently known. Estimates for the total energy released into the ICM by this outburst approach 1062 ergs. Using a new 500 ksec Chandra observation, we have performed a spatially resolved spectral analysis of the ICM in MS0735+7421. The new data clearly delineates the entire cavity boundary in both the north and south cavities. From previous VLA observations, we know these cavities to contain radio plasma at 330 and 1400 MHz. In our new image, this radio emission is entirely enclosed by the evacuated cavity structure. The immense amount of energy being released in this system and the complete apparent confinement of the radio plasma ejected from the AGN makes this object ideal for studying the energy deposition process. By fitting the gas emission measure distribution as a function of position in the cluster, we have derived a map of the mag-nitude and location of the implied heating in the ICM in MS0735.6+7421. We find that both the X-ray-derived temperature and heating maps show a clear signature of energy deposition along the cavity walls near the head of the radio jet. In the radio, these sites also correspond to a steepening in the spectral index of the emission as seen in the VLA albeit at lower spatial resolution, In this talk, we will present an analysis of the energetics of this interface region between the radio plasma inside the cavities and the X-ray emitting gas along the cavity rims. We will also discuss the constraints these observations place on AGN feedback-based heating models as well as the energy transfer mechanism itself.
- Publication:
-
38th COSPAR Scientific Assembly
- Pub Date:
- 2010
- Bibcode:
- 2010cosp...38.2625W