Ultra-high energy cosmic rays from a nearby extragalactic source in the diffusive regime. (arXiv:1903.05722v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Mollerach_S/0/1/0/all/0/1">Silvia Mollerach</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Roulet_E/0/1/0/all/0/1">Esteban Roulet</a>

We study the effects that the diffusion of the cosmic rays in the magnetic
field of the Local Supercluster can have on the spectrum of a nearby
extragalactic source at ultra-high energies. We find that the strong
enhancement of the flux below the energy at which the transition between the
diffusive and quasi-rectilinear regimes takes place, as well as the suppression
at lower energies associated with a finite source age, can help to explain the
observed features of the cosmic-ray spectrum and the composition. Scenarios are
discussed in which a nearby extragalactic source with mixed composition and
rigidity-dependent spectrum accounts for most of the observed cosmic rays at
energies above few EeV while the rest of the extragalactic sources lead to a
diffuse flux that dominates at lower energies and down to $sim 0.1$ EeV. The
nearby source can also naturally account for the dipolar anisotropy
measurements above 4 EeV.

We study the effects that the diffusion of the cosmic rays in the magnetic
field of the Local Supercluster can have on the spectrum of a nearby
extragalactic source at ultra-high energies. We find that the strong
enhancement of the flux below the energy at which the transition between the
diffusive and quasi-rectilinear regimes takes place, as well as the suppression
at lower energies associated with a finite source age, can help to explain the
observed features of the cosmic-ray spectrum and the composition. Scenarios are
discussed in which a nearby extragalactic source with mixed composition and
rigidity-dependent spectrum accounts for most of the observed cosmic rays at
energies above few EeV while the rest of the extragalactic sources lead to a
diffuse flux that dominates at lower energies and down to $sim 0.1$ EeV. The
nearby source can also naturally account for the dipolar anisotropy
measurements above 4 EeV.

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