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Stochastic re-acceleration in the ICM

Published online by Cambridge University Press:  01 August 2006

Gianfranco Brunetti  and
Alex Lazarian
Gianfranco Brunetti
Affiliation:
INAF – Istituto di Radioastronomia, via P. Gobetti 101, I–40129, Bologna, Italy
Alex Lazarian
Affiliation:
Astronomy Dep., Univ. of Wisconsin, 475 North Charter Street, Madison, WI 53706, USA
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Abstract

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Here we suggest that efficient stochastic particle re–acceleration in galaxy clusters may be driven by compressible modes. The damping of these modes is severely dominated by the TTD–resonance with thermal electrons and protons in the ICM. However, a small energy flux of these modes may be channelled into particle re-acceleration and this gives re-acceleration times of the order of ∼ 108 yrs, sufficient to mantain GeV radiating electrons in the ICM.

Keywords

acceleration of particlesturbulencegalaxies: clusters: general

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