Heating of the ICM due to mixing of fossil plasma Matthias Hoeft Marcus Brüggen International University Bremen Gustavo Yepes Universidad Autonoma de Madrid. Formation of a galaxy cluster. Identifying a merger. Radio relics. Contours: X-ray Grey-scale: Radio Abell 1664 [Govoni01].
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International University Bremen
Universidad Autonoma de Madrid
AGN fossil radio plasma relic
[McNamara et al 01]
dini = 60 kpc
remission = 20 kpc
Mvir = 1015 Msun
dE = pdV
Bubbles of radio-plasma rise in the ICM
They may deposit heat by pdV and by mixing the plasma to the ICM
Heated region depends on stability of bubbles
Pressure profile strongly affects the amount of heat
Old plasma may be revived by compression in, e.g., merger shock fronts