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

2005/07/18 by The Pierre Auger Collaboration
Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Particle Detector Development and Performance #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0507402

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

arxiv created 2005/07/18 · openalex publication_date 2005/07/18 · arxiv updated 2012/08/27 · openalex created_date 2022/09/01 · openalex updated_date 2026/07/28

Abstract

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 10¹9 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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