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arXiv:0706.1891 (astro-ph)
[Submitted on 13 Jun 2007 (v1), last revised 4 Jan 2008 (this version, v2)]

Title:Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum

Authors:Kumiko Kotera, Martin Lemoine (IAP)
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Abstract: Various experiments indicate the existence of a second knee around energy E=3.10^{17} eV in the cosmic ray spectrum. This feature could be the signature of the end of the galactic component and of the emergence of the extragalactic one, provided that the latter cuts off at low energies. Recent analytical calculations have shown that this cut-off could be a consequence of the existence of extragalactic magnetic fields: low energy protons diffuse on extragalactic magnetic fields and cannot reach the observer within a given time. We study the influence of inhomogeneous magnetic fields on the magnetic horizon, using a new semi-analytical propagation code. Our results indicate that, at a fixed value of the volume averaged magnetic field <B>, the amplitude of the low energy cut-off is mainly controled by the strength of magnetic fields in the voids of the large scale structure distribution.
Comments: 15 pages, 10 figures. Version to appear in PRD (minor changes)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.1891 [astro-ph]
  (or arXiv:0706.1891v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1891
Journal reference: Phys.Rev.D77:023005,2008
Related DOI: https://doi.org/10.1103/PhysRevD.77.023005

Submission history

From: Martin Lemoine [view email]
[v1] Wed, 13 Jun 2007 12:50:45 UTC (437 KB)
[v2] Fri, 4 Jan 2008 16:17:09 UTC (422 KB)
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