Cosmic Rays at the highest energies

Details Cosmic Rays at the highest energies Cosmic Rays at the highest energies

2012-01-21

arxiv.org/abs/1201.4519v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

8 pages, 4 figures, in the Proceedings of TAUP 2011

Scientific paper

After a century of observations, we still do not know the origin of cosmic rays. I will review the current state of cosmic ray observations at the highest energies, and their implications for proposed acceleration models and secondary astroparticle fluxes. Possible sources have narrowed down with the confirmation of a GZK-like spectral feature. The anisotropy observed by the Pierre Auger Observatory may signal the dawn of particle astronomy raising hopes for high energy neutrino observations. However, composition related measurements point to a different interpretation. A clear resolution of this mystery calls for much larger statistics than the reach of current observatories.

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