Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-28
Astropart.Phys.21:609-615,2004
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1016/j.astropartphys.2004.04.
We study the effect of random extra-galactic magnetic fields on the propagation of protons of energy larger than $10^{19}$ eV. We show that for reasonable field values (in the 100 nG range) the transition between diffusive and ballistic regimes occurs in the same energy range as the GZK cutoff (a few $10^{19}$ eV). The usual interpretation of the flux reduction above the GZK energy in terms of a sudden reduction of the visible horizon is modified. Moreover, since the size of the diffusion sphere of a continuous source of cosmic rays is of the order of 10 Mpc, the local structure of the Universe and therefore of potential local astrophysical sources plays a dominant role in the expected spectrum. Under reasonable assumptions on the sources configurations the expected GZK cutoff is reduced.
Deligny Olivier
Letessier-Selvon Antoine
Parizot Etienne
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