Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

Details Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

2009-03-05

arxiv.org/abs/0903.1127v2

Astropart.Phys.31:399-406,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

20 pages, 7 figures, 2 tables. Minor changes. Accepted by Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2009.04.

From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV = 10^18 eV) respectively. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section.

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