Anti-GZK effect in UHECR spectrum

Details Anti-GZK effect in UHECR spectrum Anti-GZK effect in UHECR spectrum

2005-07-13

arxiv.org/abs/astro-ph/0507325v1

AIP Conf.Proc.794:236-239,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 4 eps figures, talk given at IFAE 2005: Incotri Fisica Alte Energie, Catania, Italy, 30 March - 2 April 2005

Scientific paper

10.1063/1.2125660

In this paper we discuss the anti-GZK effect that arises in the framework of the diffusive propagation of Ultra High Energy (UHE) protons. This effect consists in a jump-like increase of the maximum distance from which UHE protons can reach the observer. The position of the jump is independent of the Intergalactic Magnetic Field (IMF) strength and depends only on the energy losses of protons, namely on the transition energy from adiabatic and pair-production energy losses. The Ultra High Energy Cosmic Rays (UHECR) spectrum presents a low-energy steepening approximately at this energy, which is very close to the position of the observed second knee. The dip, seen in the universal spectrum as a signature of the proton interaction with the Cosmic Microwave Background (CMB) radiation, is also present in the case of diffusive propagation in magnetic fields.

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