Abstract
It is proposed that the highest-energy cosmic rays are produced in galaxies in the central regions of clusters. The particles diffuse outwards under the influence of randomly directed intergalactic magnetic fields. Many of the particles detected at the Earth come from the Virgo cluster but if the diffusion coefficient is high enough other, more distant clusters, will also contribute significantly. The model gives a natural explanation of the measured spectral shape and anisotropy above about 1018 eV; its requirements for cosmic-ray energy in cluster sources are not excessive if, as seems likely, the production spectrum is comparatively flat (j(E) varies as tildeE- gamma with gamma in the region of 2.1 to 2.2).
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