On the Origin and Propagation of the Ultrahigh Energy Cosmic Rays

Details On the Origin and Propagation of the Ultrahigh Energy Cosmic Rays On the Origin and Propagation of the Ultrahigh Energy Cosmic Rays

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rac..conf..157g&link_type=abstract

RELATIVISTIC ASTROPHYSICS AND COSMOLOGY. Proceedings of the 13th Course of the International School of Cosmic Ray Astrophysics.

Astronomy and Astrophysics

Astrophysics

Scientific paper

The ultrahigh energy (UHE) cosmic rays (E > 1019 eV) are of particular interest for astrophysicists. Not only because of the highest parlicle energies involved but also because quite a lot can be predicted about their propagation in the extra-galactic and Galactic space. The best example is the prediction of the cutoff in the energy spectrum. In these lectures we review in some detail the UHE cosmic ray propagation, their deflections and delays in the extragalactic chaotic fields together with energy losses on the universal radiations. The latest experimental results on energy spectrum and distribution of the arrival directions are reviewed and confronted with various assumptions about the source spatial distribution. The probabilities of multiple events observed by AGASA are calculated and seem to indicate an existence of point sources, although their nature is not yet clear.

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