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Ultrahigh energy cosmic rays as heavy nuclei from cluster accretion shocks
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abstract
Large-scale accretion shocks around massive clusters of galaxies, generically expected in the cold dark matter scenario of cosmological structure formation, are shown to be plausible sources of the observed ultrahigh energy cosmic rays (UHECRs) by accelerating a mixture of heavy nuclei including the iron group elements. Current observations can be explained if the source composition at injection for the heavier nuclei is somewhat enhanced from simple expectations for the accreting gas. The proposed picture should be clearly testable by current and upcoming facilities in the near future through characteristic features in the UHECR spectrum, composition and anisotropy, in particular the rapid increase of the average mass composition with energy from $10^{19}$ to $10^{20}$ eV.
Forward citations
Cited by 2 Pith papers
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Cosmic ray heating of cold streams: Implications for the gas supply and growth of massive galaxies
Externally entrained cosmic-web CRs weakly heat dense cold-stream cores but can strongly heat diffuse and mixed interface gas in massive haloes, adding selectivity to cold accretion.
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Ultra High Energy Cosmic Rays
A comprehensive review concluding that UHECRs are likely heavy nuclei and that accretion shocks and jets are the most promising sources, with no new experimental results.
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