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Upper limits on the ultra high energy photon fraction with the Pierre Auger Observatory

Abstract : We use the Pierre Auger Observatory to set an upper limit on the photon fraction in UHECR. With a restricted set of hybrid events, we present an upper limit of 16% (at 95% confidence level) for cosmic rays above 1019eV. Using the surface detector (SD) we can also make an attempt towards a very promissing result in this field. The first result obtained with an hybrid analysis is summarized here. A surface detector stand alone analysis is also discussed.
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2006sf2a.conf.0179R.pdf
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C. Roucelle. Upper limits on the ultra high energy photon fraction with the Pierre Auger Observatory. SF2A-2006: 26ème Semaine de l'Astrophysique Française, Jun 2006, Paris, France. pp.179-182. ⟨in2p3-00135985⟩

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