Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3414r&link_type=abstract
American Astronomical Society, HEAD meeting #11, #34.14; Bulletin of the American Astronomical Society, Vol. 41, p.712
Other
Scientific paper
The physics regulating the dense gas at the centers of galaxy clusters is far from being fully understood. Moreover, no comprehensive and systematic census of observed, detailed properties of cluster cores exists up to now. We aim to put the statistical description of cluster centers on a firm new footing in order to: (1) gain insight into the physics governing cluster cores, (2) identify the best parameter for characterizing cool core clusters for given data quality and (3) provide a benchmark for theoretical modeling and numerical simulations of cluster cores. We summarize 16 widely used as well as new cool core diagnostics and apply them to the largest complete and well-controlled cluster sample with available high quality data (HIFLUGCS, the HIghest X-ray FLUx Galaxy Cluster Sample, 64 clusters with >4.5 Ms of cleaned Chandra data). Moreover, we correlate the different diagnostics with each other, so that studies of, e.g., the fraction of cool core clusters using various definitions may be compared. Selection effects due to the flux-limited nature of the sample that affect the cool-core fraction are corrected for, for the first time. Furthermore, the optical and radio properties of the brightest cluster galaxies, as well as implications for AGN feedback in cluster cores are discussed. The effect of cooling and AGN heating on the L-T relation is described.
Mittal Rajat
Reiprich Thomas H.
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