Extra-galactic magnetic fields and the second knee in the cosmic-ray spectrum

Details Extra-galactic magnetic fields and the second knee in the cosmic-ray spectrum Extra-galactic magnetic fields and the second knee in the cosmic-ray spectrum

2004-11-07

arxiv.org/abs/astro-ph/0411173v2

Phys.Rev. D71 (2005) 083007

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures; expanded version to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.71.083007

Recent work suggests that the cosmic ray spectrum may be dominated by Galactic sources up to ~10^{17.5} eV, and by an extra-Galactic component beyond, provided this latter cuts off below the transition energy. Here it is shown that this cut-off could be interpreted in this framework as a signature of extra-galactic magnetic fields with equivalent average strength B and coherence length l_c such that B\sqrt{l_c} ~ 2-3.10^{-10} G.Mpc^{1/2}, assuming l_c < r_L (Larmor radius at 10^{17} eV) and continuously emitting sources with density 10^{-5}/Mpc^3. The extra-Galactic flux is suppressed below 10^{17} eV as the diffusive propagation time from the source to the detector becomes larger than the age of the Universe.

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