Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e...8b&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #8
Astronomy and Astrophysics
Astrophysics
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 and are becoming now an important topic of modern astrophysics. - In this talk I will first review the observational and theoretical evidences in favour of particle acceleration processes active in galaxy clusters and their connection with the formation of clusters themselves. These evidences make galaxy clusters important laboratories to study the physics of particle acceleration. - I will then briefly focus on the physics of stochastic particle acceleration mechanisms in galaxy clusters, on the resulting modeling of the non-thermal emission, and on the comparison between expectations and present observations. - Finally I will discuss a few important expectations by these modelings and the role of future long wavelength observations in testing these predictions and - in general - in studying the physics of acceleration processes in galaxy clusters.
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