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

Conference · Fri Jul 01 00:00:00 EDT 2005

OSTI ID:15020266

Risse, Markus

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{sup 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.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 15020266
• Report Number(s): FERMILAB-CONF-05-274-E-TD; arXiv eprint number astro-ph/0507402; TRN: US0605079
• Resource Relation: Conference: Presented at 29th International Cosmic Ray Conference (ICRC 2005), Pune, India, 3-11 Aug 2005
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ORIGIN
PHOTONS
ASTROPHYSICS
Astrophysics