Heating of the ICM due to mixing of  fossil plasma
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Heating of the ICM due to mixing of fossil plasma Matthias Hoeft Marcus Brüggen International University Bremen Gustavo Yepes Universidad Autonoma de Madrid - PowerPoint PPT Presentation


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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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Heating of the ICM due to mixing of fossil plasma Matthias Hoeft Marcus Brüggen International University Bremen Gustavo Yepes Universidad Autonoma de Madrid

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Heating of the icm due to mixing of fossil plasma matthias hoeft marcus br ggen international university bremen gustav

Heating of the ICM due to mixing of fossil plasma

Matthias Hoeft

Marcus Brüggen

International University Bremen

Gustavo Yepes

Universidad Autonoma de Madrid




Radio relics
Radio relics

Contours: X-ray

Grey-scale: Radio

Abell 1664

[Govoni01]


Model
Model

AGN fossil radio plasma relic


Ghost cavities
Ghost cavities

Abell 2597

[McNamara et al 01]


Bubbles rise buoyantly
Bubbles rise buoyantly

Relic?

dini = 60 kpc

remission = 20 kpc

Mvir = 1015 Msun

Cavity

AGN






Total pdv heat
Total pdV-heat

steeper P

no splitting

1/3 volume


E momentum spectrum
e- momentum spectrum

300 Myr

100 Myr


Bubble in shock front
Bubble in shock front

[Enßlin&Brüggen01]





Conclusion
Conclusion

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


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