AAS 207th Meeting, 8-12 January 2006
Session 162 X-ray and Gamma ray Observations of Clusters of Galaxies
Oral, Wednesday, 2:00-3:30pm, January 11, 2006, Salon 3

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[162.02] X-ray thermal coronae of galaxies in nearby hot clusters

M. Sun (MSU)

I present the first systematic investigation of X-ray thermal coronae of both early-type and late-type galaxies in hot clusters. About 160 galaxies in 21 nearby hot clusters were examined, based on the archival Chandra data (51 pointings with a total exposure of 1.7 Msec). Small cool X-ray coronae of early-type galaxies (1-4 kpc in radius, 0.5 - 1.5 keV), pressure confined in hot (> 3 keV) clusters, are found to be very common, although their properties have been significantly modified by the dense ICM environment. Despite the effects of gas stripping, ICM evaporation, intense radiative cooling and AGN outbursts of the central SMBH, the common survival of these dense mini cooling cores puts interesting constraints on relevant physics, e.g., cooling, AGN feedbacks, stellar feedbacks and microscopic transport processes. The detailed analysis for the ~ 10 brightest coronae will also be presented. Some thermal coronae of late-type galaxies were also detected (including ones with spectacular stripping tail), with LX roughly scaled with the SF rate.

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