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dc.contributor.authorAbraham, J.-
dc.contributor.authorAglietta, M.-
dc.contributor.authorAguirre, C.-
dc.contributor.authorAllard, D.-
dc.contributor.authorPepe, Iuri Muniz-
dc.creatorAbraham, J.-
dc.creatorAglietta, M.-
dc.creatorAguirre, C.-
dc.creatorAllard, D.-
dc.creatorPepe, Iuri Muniz-
dc.descriptionp. 155–168pt_BR
dc.description.abstractAn upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 1019 eV, based on observations of the depth of shower maximum 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 Auger surface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored.pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectCosmic rayspt_BR
dc.subjectUltra-high energy photonspt_BR
dc.subjectExtensive air showerspt_BR
dc.subjectPierre Auger Observatorypt_BR
dc.titleAn upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatorypt_BR
dc.title.alternativeAstroparticle Physicspt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 27, n. 2-3pt_BR
Appears in Collections:Artigo Publicado em Periódico (FIS)

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