On a possible photon origin of the most-energetic AGASA events

Details On a possible photon origin of the most-energetic AGASA events On a possible photon origin of the most-energetic AGASA events

2004-11-02

arxiv.org/abs/astro-ph/0411060v1

Nucl. Phys. B (Proc. Suppl.) 151 (2006) 116

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure, 2 tables; presented at XIII ISVHECRI, Pylos, Greece

Scientific paper

10.1016/j.nuclphysbps.2005.07.02

In this work the ultra high energy cosmic ray events recorded by the AGASA experiment are analysed. With detailed simulations of the extensive air showers initiated by photons, the probabilities are determined of the photonic origin of the 6 AGASA events for which the muon densities were measured and the reconstructed energies exceeded 10^20 eV. On this basis a new, preliminary upper limit on the photon fraction in cosmic rays above 10^20 eV is derived and compared to the predictions of exemplary top-down cosmic-ray origin models.

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