Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..215f&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
Scientific paper
In the past year, the HiRes and Auger collaborations have reported the discovery of a high-energy cutoff in the ultra-high-energy cosmic-ray (UHECR) spectrum, and an apparent clustering of the highest energy events towards nearby active galactic nuclei (AGNs). Consensus is building that such 10^{19}- 10^{20} eV particles are accelerated within the radio-bright lobes of these sources, but it is not yet clear how this actually happens. We report (to our knowledge) the first treatment of particle acceleration in such environments from first principles, showing that energies of order 10^{20} eV are reached in 10^7 years for protons. This prediction appears to be consistent with the Auger observations. However, our findings reopen the question regarding whether the high-energy cutoff is due solely to propagation effects, or whether it represents the maximum energy permitted by the acceleration process itself.
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