A Systematic Search For X-ray Cavities In Galaxy Clusters

Details A Systematic Search For X-ray Cavities In Galaxy Clusters A Systematic Search For X-ray Cavities In Galaxy Clusters

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714913m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #149.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We have performed a systematic search for X-ray cavities in the hot gas of 280 galaxy clusters using Chandra archival data. The cavities are identified by subtracting an elliptical beta-model fitted to the X-ray surface brightness. Standard data reduction and calibration was performed to the cluster data using the most recent version of CALDB. Exposure maps were computed for the clusters assuming a mono-energetic distribution of source photons at the peak flux energy (usually around 1keV). The source images were then normalized by the exposure map, correcting for the effect of strongly variable exposure near the detector edges. A beta-model was then fitted and a residual image was obtained. The residual images were then visually inspected for cavities. Finally, we modeled the cavities as ellipses. We find tight correlations between the radial and tangential radii of the cavities, and between their size and projected distance from the cluster center, in quantitative agreement with the case for groups. This suggests that similar physical processes are responsible for cavity evolution and disruption in systems covering a large range in total mass.

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