Please use this identifier to cite or link to this item:
metadata.dc.type: Artigo de Periódico
Title: An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory
Other Titles: Astroparticle Physics
Authors: Abraham, J.
Aglietta, M.
Aguirre, C.
Allard, D.
Pepe, Iuri Muniz
metadata.dc.creator: Abraham, J.
Aglietta, M.
Aguirre, C.
Allard, D.
Pepe, Iuri Muniz
Abstract: An 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.
Keywords: Cosmic rays
Ultra-high energy photons
Extensive air showers
Pierre Auger Observatory
metadata.dc.rights: Acesso Aberto
Issue Date: 2007
Appears in Collections:Artigo Publicado em Periódico (FIS)

Files in This Item:
File Description SizeFormat 
1-s2.0-S0927650506001587-main.pdf303,01 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.