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Ultra High Energy Cosmic Ray Accelerators

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arxiv astro-ph/9911154 v1 pith:WQOVHJXY submitted 1999-11-09 astro-ph

Ultra High Energy Cosmic Ray Accelerators

classification astro-ph
keywords cosmicenergyhighaccelerationdistributionmodelsspectrumstar
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The surprising lack of a high energy cutoff in the cosmic ray spectrum at the highest energies together with an apparently isotropic distribution of arrival directions have strongly challenged most models proposed for the acceleration of ultra high energy cosmic rays. Young neutron star winds may be able to explain the mystery. We discuss this recent proposal after summarizing the observational challenge and plausible acceleration sites. Young neutrons star winds differ from alternative models in the predictions for composition, spectrum, and angular distribution which will be tested in future experiments.

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