An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory

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dc.contributor.authorAbraham, J.
dc.contributor.authorAglietta, M.
dc.contributor.authorAguirre, C.
dc.contributor.authorAllard, D.
dc.contributor.authorAllekotte, I.
dc.contributor.authorAllison, P.
dc.contributor.authorAlvarez, C.
dc.contributor.authorAlvarez-Muñiz, J.
dc.contributor.authorAmbrosio, M.
dc.contributor.authorAnchordoqui, L.
dc.contributor.authorAnjos, J. C.
dc.contributor.authorAramo, C.
dc.contributor.authorArisaka, K.
dc.contributor.authorArmengaud, E.
dc.contributor.authorArneodo, F.
dc.contributor.authorArqueros, F.
dc.contributor.authorAsch, T.
dc.contributor.authorAsorey, H.
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dc.date.accessioned2024-06-28T18:10:03Z
dc.date.available2024-06-28T18:10:03Z
dc.date.issued2007-03-01
dc.description.abstractAn upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 1019eV, 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.
dc.description.sponsorshipWe are very grateful to the following agencies and organisations for financial support: Gobierno de Mendoza, Comisio´n Nacional de Energia Ato´mica y Municipalidad de Malargu¨e, Argentina; the Australian Research Council; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico and Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro, Brasil; National Science Foundation of China; Ministry of Education of the Czech Republic (projects LA134 and LN00A006); Centre National de la Recherche Scientifique, Institut National de Physique Nucle´aire et Physique des Particules (IN2P3/CNRS), Institut National des Sciences de l’Univers (INSU/CNRS) et Conseil Re´gional Ile de France, France; German Ministry for Education and Research and Forschungszentrum Karlsruhe, Germany; Istituto Nazionale di Fisica Nucleare, Italy; Consejo Nacional de Ciencia y Tecnologia, Mexico; the Polish State Committee for Scientific Research (grant numbers 1P03D 01430, 2P03B 11024 and 2PO3D 01124), Poland; Slovenian Research Agency; Ministerio de Educacio´n y Ciencia (FPA2003-08733-C02, 2004-01198), Xunta de Galicia (2003 PXIC20612PN, 2005 PXIC20604PN) and Feder Funds, Spain; Particle Physics and Astronomy Research Council, UK; the US Department of Energy, the US National Science Foundation, USA, and UNESCO. Partial support of ALFA-EC funds, in the framework of the HELEN Project, is gratefully acknowledged.
dc.description.urihttps://www.sciencedirect.com/science/article/pii/S0927650506001587
dc.format.extent14 pages
dc.genrejournal articles
dc.identifierdoi:10.13016/m2rerc-7vt6
dc.identifier.citationAbraham, J., M. Aglietta, C. Aguirre, D. Allard, I. Allekotte, P. Allison, C. Alvarez, et al. “An Upper Limit to the Photon Fraction in Cosmic Rays above 1019 eV from the Pierre Auger Observatory.” Astroparticle Physics 27, no. 2 (March 1, 2007): 155–68. https://doi.org/10.1016/j.astropartphys.2006.10.004.
dc.identifier.urihttps://doi.org/10.1016/j.astropartphys.2006.10.004
dc.identifier.urihttp://hdl.handle.net/11603/34768
dc.language.isoen
dc.publisherELSEVIER
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rightsPublic Domain
dc.rights.urihttps://creativecommons.org/publicdomain/mark/1.0/
dc.subjectCosmic rays
dc.subjectExtensive air showers
dc.subjectPierre Auger Observatory
dc.subjectUltra-high energy photons
dc.titleAn upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0002-4027-1855

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