Photons as Ultra High Energy Cosmic Rays ?

Details Photons as Ultra High Energy Cosmic Rays ? Photons as Ultra High Energy Cosmic Rays ?

2001-07-06

arxiv.org/abs/astro-ph/0107130v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures

Scientific paper

We study spectra of the Ultra High Energy Cosmic Rays assuming primaries are protons and photons, and that their sources are extragalactic. We assume power low for the injection spectra and take into account the influence of cosmic microwave, infrared, optical and radio backgrounds as well as extragalactic magnetic fields on propagation of primaries. Our additional free parameters are the maximum energy of injected particles and the distance to the nearest source. We find a parameter range where the Greisen-Zatsepin-Kuzmin cut-off is avoided.

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