X-ray thermal coronae of galaxies in hot clusters -- ubiquity of embedded mini cooling cores

We present a systematic investigation of X-ray thermal coronae in 157 early-type galaxies and 22 late-type galaxies from a survey of 25 hot (kT>3 keV), nearby (z 60% in NIR selected galaxies that are more luminous than 2L*, and >40% in L* 100, which implies the X-ray gas in early-type galaxies is magnetized and the magnetic field plays an important role in energy transfer. Stripping through transport processes (viscosity or turbulence) also needs to be suppressed by at least a factor of ten at the coronal boundary... (abridged) Diffuse thermal coronae have also been detected in at least 8 of 22 late-type (Sb or later) galaxies in our sample. Evidence for enhanced star formation triggered by the ICM pressure has been found in four late-type galaxies. The fraction of luminous X-ray AGN (>10^41 ergs s^-1) is not small (~ 5%) in our sample.

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