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Cosmic ray acceleration at supergalactic accretion shocks: a new upper energy limit due to a finite shock extension

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Type
Preprint
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Submission Date
Identifiers
DOI: 10.1051/0004-6361:20020308
arXiv ID: astro-ph/0203103
Source
arXiv
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Unknown
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Abstract

Accretion flows onto supergalactic-scale structures are accompanied with large spatial scale shock waves. These shocks were postulated as possible sources of ultra-high energy cosmic rays. The highest particle energies were expected for perpendicular shock configuration in the so-called "Jokipii diffusion limit", involving weakly turbulent conditions in the large-scale magnetic field imbedded in the accreting plasma. For such configuration we discuss the process limiting the highest energy that particles can obtain in the first-order Fermi acceleration process due to finite shock extensions to the sides, along and across the mean magnetic field. Cosmic ray outflow along the shock structure can substantially lower (below ~10^18 eV for protons) the upper particle energy limit for conditions considered for supergalactic shocks.

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