Anti-GZK effect in Ultra High Energy Cosmic Rays diffusive propagation

Details Anti-GZK effect in Ultra High Energy Cosmic Rays diffusive propagation Anti-GZK effect in Ultra High Energy Cosmic Rays diffusive propagation

2004-12-21

arxiv.org/abs/astro-ph/0412578v4

Astrophys.J. 625 (2005) 249-255

Astronomy and Astrophysics

Astrophysics

19 pages, 8 figures, a typo corrected

Scientific paper

10.1086/429615

We discuss the antiGZK effect in the diffusive propagation of ultra high energy protons in intergalactic magnetic fields, which consists in a jump-like increase of the maximum distance from which ultra high energy protons can reach an observer. The position of this jump, $E_j \approx 2\times 10^{18}$ eV, is determined exclusively by energy losses (transition from adiabatic to pair-production energy losses) and it is independent of the diffusion parameters. The diffuse spectrum presents a low-energy steepening approximately at this energy, which is very close to the position of the second knee observed in the cosmic ray spectrum. The dip, seen in the universal spectrum as a signature of the interaction with the cosmic microwave background radiation, is also present in the case of diffusive propagation in magnetic fields.

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