Stochastic Particle acceleration in galaxy clusters

Details Stochastic Particle acceleration in galaxy clusters Stochastic Particle acceleration in galaxy clusters

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e..13b&link_type=abstract

Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #13

Physics

Scientific paper

The Mpc-scale radio non-thermal emission detected in a growing number of galaxy clusters proves the presence of GeV radiating electrons in microGauss magnetic fields. The origin of these emitting particles and the energy content in the form of cosmic rays in galaxy clusters are still matter of debate. I will briefly review the incoming observational and theoretical evidences in favour of stochastic particle acceleration in galaxy clusters, and the present understanding of the physics of turbulence in the ICM. Then I will focus on the physics of particle acceleration via collisionless damping with MHD modes in the ICM. In particular I will report on new results on resonant particle acceleration with Alfven and Fast Modes (gyroresonance and TTD) and on non-resonant acceleration with compressive Modes in the ICM. I will compare the efficiency of these different mechanisms and show that the observational properties of non-thermal emission from galaxy clusters are in line with model expectations.

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