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

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arxiv astro-ph/0411173 v2 pith:AEVTZ4EJ submitted 2004-11-07 astro-ph

Martin Lemoine (IAP) This is my paper · ORCID
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keywords extra-galacticbelowfieldsmagneticsourcesspectrumassumingaverage
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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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Ultraheavy Ultrahigh-Energy Cosmic Rays

    astro-ph.HE 2024-05 unverdicted novelty 7.0 of 10

    Ultraheavy nuclei have longer energy loss lengths at ≲300 EeV than lighter nuclei, allowing them to explain UHECRs above 100 EeV from sources like collapsars and neutron star mergers while predicting distinct shower maxima.

  2. Study of Flat Spectrum Radio Quasars and BL Lacertae Objects as Sources of Diffusive Ultra High-Energy Cosmic Rays

    astro-ph.HE 2025-11 unverdicted novelty 4.0 of 10

    BL Lacs remain consistent with UHECR observations while FSRQs are disfavoured by anisotropy and source density mismatches after propagation modeling.

  3. Analysing Ultra High Energy Cosmic Rays' Anisotropy in $\boldsymbol{f(R, T)}$ Gravity Theory

    astro-ph.HE 2024-12 conditional novelty 4.0 of 10

    Under f(R,T) gravity models, the predicted dipole anisotropy of diffusive UHECRs is lower than under ΛCDM, and with tuned magnetic field and source distance both fit Pierre Auger data.

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