Upper limit on the photon fraction in highest-energy cosmic rays from AGASA data

Details Upper limit on the photon fraction in highest-energy cosmic rays from AGASA data Upper limit on the photon fraction in highest-energy cosmic rays from AGASA data

2005-02-21

arxiv.org/abs/astro-ph/0502418v3

Phys.Rev.Lett. 95 (2005) 171102

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Analysis extended to account for primary energy resolution; conclusions unchanged. Accepted by Phys. Rev.

Scientific paper

10.1103/PhysRevLett.95.171102

A new method to derive an upper limit on photon primaries from small data sets of air showers is developed which accounts for shower properties varying with the primary energy and arrival direction. Applying this method to the highest-energy showers recorded by the AGASA experiment, an upper limit on the photon fraction of 51% (67%) at a confidence level of 90% (95%) for primary energies above 1.25 * 10^20 eV is set. This new limit on the photon fraction above the GZK cutoff energy constrains the Z-burst model of the origin of highest-energy cosmic rays.

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