Abstract

If, as recently proposed by Farrar and Piran, Cen A is the source of cosmic rays detected above the Greisen-Zatsepin-Kuz’min cutoff, neutrons are ≈ 140 more probable than protons to be observed along its line of sight. This is because the proton flux is rendered nearly isotropic by O(μG) intergalactic magnetic fields. With the anticipated aperture of the Southern Auger Observatory, one may expect on the order of 2 neutron events/year above 1020 eV in the line of sight of Cen A.

Notes

Originally posted at http://arxiv.org/abs/astro-ph/0103043v3. Preprint of an article published in Physical Review Letters, v.87 no.8, 2001.

Keywords

Cen A, high energy cosmic rays, Auger test, Greisen-Zatsepin-Kuz’min cutoff

Subject Categories

Cosmic rays, Astrophysics, Neutrons, Protons

Disciplines

Physics

Publication Date

2001

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