Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-04
Astronomy and Astrophysics
Astrophysics
To appear in the proceedings of "Rencontres de Moriond: Very High Energy Phenomena in the Universe", La Thuile, Italy (March 1
Scientific paper
Protons can be plausibly accelerated to $\sim 10^{18}$-$10^{19}$ eV in strong accretion shocks surrounding massive clusters of galaxies. Such protons efficiently produce very high energy pairs through interactions with the CMB, which then radiate synchrotron and inverse Compton emission with hard spectra, peaking respectively in hard X-rays and TeV gamma-rays. We discuss the prospects for detecting this emission from nearby clusters with current and future facilities such as HESS and NeXT, which should provide a clear signature of ultra-high energy proton acceleration and an important probe of magnetic fields in the outermost regions of clusters.
Aharonian Felix A.
Inoue Susumu
Sugiyama Naoshi
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