Pierre Auger: The Sources and Composition of Cosmic Rays

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Determining the sources and composition of UHECRs are intertwined problems which cannot be solved independently of each other. The challenge is increased by the lack of important auxiliary information. For instance the particle interactions which determine the properties of the atmospheric showers are directly constrained by experiment only at much lower energy, and we have only approximate information on Galactic and extragalactic magnetic fields. Progress is being made thanks to detailed observations of large numbers of atmospheric showers of individual UHECRs -- measuring the longitudinal development, muon content, and other properties of the shower -- to constrain both UHE particle physics and the composition of the UHECRs. A complementary approach is looking for anisotropies in arrival directions and for correlations between the arrival directions of UHECRs and potential source catalogs. An overview of results from the Pierre Auger Collaboration will be given.

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