Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-18
Mon.Not.Roy.Astron.Soc. 350 (2004) 1174
Astronomy and Astrophysics
Astrophysics
including comments of the referee, 23 pages, 21 figures, Latex, MNRAS in press
Scientific paper
10.1111/j.1365-2966.2004.07727.x
There is a growing evidence that extended radio halos are most likely generated by electrons reaccelerated via some kind of turbulence generated in the cluster volume during major mergers. It is well known that Alfv\'en waves channel most of their energy flux in the acceleration of relativistic particles. Much work has been done recently to study this phenomenon and its consequences for the explanation of the observed non-thermal phenomena in clusters of galaxies. We investigate here the problem of particle-wave interactions in the most general situation in which relativistic electrons, thermal protons and relativistic protons exist within the cluster volume. The interaction of all these components with the waves, as well as the turbulent cascading and damping processes of Alfv\'en waves, are treated in a fully time-dependent way. This allows us to calculate the spectra of electrons, protons and waves at any fixed time. The {\it Lighthill} mechanism is invoked to couple the fluid turbulence, supposedly injected during cluster mergers, to MHD turbulence. We find that present observations of non-thermal radiation from clusters of galaxies are well described within this approach, provided the fraction of relativistic hadrons in the intracluster medium (ICM) is smaller than 5-10 %.
Blasi Pasquale
Brunetti Gianfranco
Cassano Rossella
Gabici Stefano
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