An upper limit to the photon fraction in cosmic rays above $10^{19}$-eV from the Pierre Auger Observatory
2007
Abstract An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10 19 eV, based on observations of the depth of
showermaximum performed with the hybrid detector of the
Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of
air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the
Augersurface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored.
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