Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-06-19
Phys.Rev.D59:023001,1999
Astronomy and Astrophysics
Astrophysics
11 pages, 2 figures, submitted to PRD
Scientific paper
10.1103/PhysRevD.59.023001
A sufficiently magnetized Local Supercluster can explain the spectrum and angular distribution of ultra-high energy cosmic rays. We show that the spectrum of extragalactic cosmic rays with energies below $\sim 10^{20}$ eV may be due to the diffusive propagation in the Local Supercluster with fields of $\sim 10^{-8} - 10^{-7}$ Gauss. Above $\sim 10^{20}$ eV, cosmic rays propagate in an almost rectilinear way which is evidenced by the change in shape of the spectrum at the highest energies. The fit to the spectrum requires that at least one source be located relatively nearby at $\sim 10-15$ Mpc away from the Milky Way. We discuss the origin of magnetic fields in the Local Supercluster and the observable predictions of this model.
Blasi Pasquale
Olinto Angela V.
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