Identifying nearby accelerators of ultrahigh energy cosmic rays using ultrahigh energy (and very high energy) photons.

Identifying nearby accelerators of ultrahigh energy cosmic rays using ultrahigh energy (and very high energy) photons.

Taylor, A M;Hinton, J A;Blasi, P;Ave, M;
physical review letters 2009 Vol. 103 pp. 051102
221
taylor2009identifyingphysical

Abstract

Ultrahigh energy photons (UHE, E>10(19) eV) are inevitably produced during the propagation of approximately 10(20) eV protons in extragalactic space. Their short interaction lengths (<20 Mpc) at these energies, combined with the impressive sensitivity of the Pierre Auger Observatory detector to these particles, makes them an ideal probe of nearby ultrahigh energy cosmic ray (UHECR) sources. We here discuss the particular case of photons from a single nearby (within 30 Mpc) source in light of the possibility that such an object might be responsible for several of the UHECR events published by the Auger collaboration. We demonstrate that the photon signal accompanying a cluster of a few >6 x 10(19) eV UHECRs from such a source should be detectable by Auger in the near future. The detection of these photons would also be a signature of a light composition of the UHECRs from the nearby source.

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