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30th International Cosmic Ray Conference, Merida : Mexique (2007)
Horizons and Anisotropies of Ultra-High Energy Cosmic Rays
A. Olinto1, D. Allard1, E. Armengaud2, A. Kravtsov

We study the propagation of cosmic rays at the highest energies of different compositions and discuss the implications for anisotropy studies of future UHECR observatories. The evolution of the horizon of cosmic rays as a function of the energy is mass dependent: low and intermediate mass nuclei can only originate from very nearby sources above a few 10^19 eV and the composition above 4.10^19 eV should be mainly protons with a small iron fraction. We show the expected sky anisotropies between 10^19 and 10^20.5 eV for exposures from 10^4 to 10^6 km^2 sr yr.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie