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Ultra-high energy cosmic rays detected by the Pierre Auger observatory First direct evidence, and its implications, that a subset originate in nearby radiogalaxies
Context. The Pierre Auger Collaboration has reported 27 Ultra-High Energy Cosmic Ray Events (UHECRs) with energies above 56 × 10 18 eV (56 EeV) and well determined arrival directions as of 2007 August 31. They find that the arrival directions of these UHECRs are not isotropic, but instead appear correlated …