A Constraint on Electromagnetic Acceleration of Highest Energy Cosmic Rays

Abstract

The energetics of electromagnetic acceleration of ultra-high-energy cosmic rays (UHECRs) is constrained both by confinement of a particle within an acceleration site and by radiative energy losses of the particle in the confining magnetic fields. We demonstrate that the detection of ~ 3 x 10^{20} eV events is inconsistent with the hypothesis that compact cosmic accelerators with high magnetic fields can be the sources of UHECRs. This rules out the most popular candidates, namely spinning neutron stars, active galactic nuclei (AGNs), and gamma-ray burst blast waves. Galaxy clusters and, perhaps, AGN radio lobes remain the only possible (although not very strong) candidates for UHECR acceleration sites. Our analysis places no limit on linear accelerators. With the data from the future Auger experiment one should be able to answer whether a conventional theory works or some new physics is required to explain the origin of UHECRs.

5 pages, 2 figures. Accepted for publication in PRE

References in corpus (2)

• Constraints on the Extremely High-Energy Cosmic Ray Accelerators from Classical Electrodynamics
• Adiabatic Losses and Stochastic Particle Acceleration in Gamma-Ray Burst Blast Waves

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