Ultra-high energy cosmic rays detected by the Pierre Auger observatory
Ultra-high energy cosmic rays detected by the Pierre Auger observatory
Context. The Pierre Auger Collaboration has reported 27 Ultra-High Energy Cosmic Ray Events (UHECRs) with energies above 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 with the positions of …