Upper limit on the primary photon fraction from the Pierre Auger Observatory

Details Upper limit on the primary photon fraction from the Pierre Auger Observatory Upper limit on the primary photon fraction from the Pierre Auger Observatory

2005-07-18

arxiv.org/abs/astro-ph/0507402v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. To be presented at the 29th ICRC, Pune, August 2005. The Pierre Auger author list is given at http://www.a

Scientific paper

Based on observations of the depth of shower maximum performed with the hybrid detector of the Auger Observatory, an upper limit on the cosmic-ray photon fraction of 26% (at 95% confidence level) is derived for primary energies above 10^19 eV. Additional observables recorded with the surface detector array, available for a sub-set of the data sample, support the conclusion that a photon origin of the observed events is not favoured.

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