Upper limit on the primary photon fraction from the Pierre Auger Observatory
Conference
·
OSTI ID:15020266
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 Laboratory (FNAL), Batavia, IL
- 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
- Country of Publication:
- United States
- Language:
- English
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