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Title:
Ultra-high-energy cosmic rays from the radio lobes of active galactic nuclei
Authors:
Fraschetti, F.; Melia, F.
Affiliation:
AA(LUTh, Observatoire de Paris, CNRS-UMR8102 and Université Paris VII, 5 Place Jules Janssen, F-92195 Meudon Cédex, France; Laboratoire AIM, CEA/DSM - CNRS - Université Paris Diderot, Irfu/Service d'Astrophysique, F-91191 Gif sur Yvette Cédex, France), AB(Department of Physics and Steward Observatory, The University of Arizona, Tucson, AZ 85721, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 391, Issue 043005, pp. 1100-1106. (MNRAS Homepage)
Publication Date:
12/2008
Origin:
MNRAS
MNRAS Keywords:
acceleration of particles , plasmas , turbulence , cosmic rays , galaxies: active , galaxies: nuclei
DOI:
10.1111/j.1365-2966.2008.13987.x
Bibliographic Code:
2008MNRAS.391.1100F

Abstract

In the past year, the HiRes and Auger collaborations have reported the discovery of a high-energy cut-off in the ultra-high-energy cosmic ray spectrum, and an apparent clustering of the highest energy events towards nearby active galactic nuclei. Consensus is building that such ~1019-1020 eV particles are accelerated within the radio-bright lobes of these sources, but it is not yet clear how this actually happens. In this paper, we report (to our knowledge) the first treatment of stochastic particle acceleration in such environments from first principles, showing that energies ~1020 eV are reached in ~106 yr for protons. However, our findings reopen the question regarding whether the high-energy cut-off is due solely to propagation effects, or whether it does in fact represent the maximum energy permitted by the acceleration process itself.
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