On the shape of the UHE cosmic ray spectrum

Details On the shape of the UHE cosmic ray spectrum On the shape of the UHE cosmic ray spectrum

2005-06-14

arxiv.org/abs/astro-ph/0506318v2

Phys.Rev.D72:081301,2005

Astronomy and Astrophysics

Astrophysics

5 pages, version accepted in PRD

Scientific paper

10.1103/PhysRevD.72.081301

We fit the ultra high energy cosmic ray spectra above 10$^{19}$ eV with different injection spectra at cosmic ray sources that are uniformly and homogeneously distributed in the Universe. We conclude that the current UHE spectra are consistent with power laws of index $\alpha$ between 2.4 and 2.7. There is a slow dependence of these indices on the cosmological evolution of the cosmic ray sources, which in this model determines the end of the galactic cosmic rays spectrum.

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