Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2009
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Resumo |
From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV equivalent to 10(18) eV), respectively. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section. (C) 2009 Elsevier B.V. All rights reserved. Comision Nacional de Energia Atomica, Argentina Fundacion Antorchas Gobierno De La Provincia de Mendoza, Municipalidad de Malargue, Argentina NDM Holdings Australian Research Council (ARC) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Financiadora de Estudos e Projetos (FINEP) Fundacao de Amparo A Pesquisa do Estado de Rio de Janeiro (FAPERJ) Fundacao de Amparo A Pesquisa do Estado de Sao Paulo (FAPESP) Ministério da Ciência, Tecnologia e Inovação do Brasil (MCTI) Academy of Sciences of the Czech Republic (AVCR) [AV0Z10100502, AV0Z10100522] Czech Republic, GAAV [KJB300100801, KJB100100904] Czech Republic, MSMT-CR [LA08016, LC527, 1M06002, MSM0021620859] Centre de Calcul [IN2P3/CNRS], Centre National de la Recherche Scientifique (CNRS) Departement Sciences de l`Univers (SDU-INSU/CNRS), France Bundesministerium fur Bildung und Forschung (BMBF) Deutsche Forschungsgemeinschaf (DFG) Finanzministerium Baden-Wurttemberg Helmholtz-Gerneinschaft Deutscher Forschungszentren (HGF) Ministerium fur Wissenschaft und Forschung, Nordrhein-Westfalen Ministerium fur Wissenschaft und Forschung und Kunst, Baden-Wurttemberg, Germany Istituto Nazionale di Fisica Nucleare (INFN) Ministero dell Istruzione, dell Università e della Ricerca della Itália (MIUR) Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico Ministerie van Onderwijs, Cultuur en Wetenschap, Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) Stichting voor Fundamenteel Onderzoek der Materie (Foundation for Fundamental Research on Matter- FOM), Netherlands Ministry of Science and Higher Education[1 P03 D 014 30, N202 090 31/0623, PAP/218/2006] Fundacao para a Ciência e a Tecnologia (FCT), Portugal Ministry for Higher Education, Science, and Technology, Slovenian Research Agency, Slovenia Comunidad de Madrid, Spain Consejeria de Educacion de la Comunidad de Castilla La Mancha Fondo Europeo de Desarrollo Regional (FEDER) Ministerio de Ciencia e Innovacion, Xunta de Galicia, Spain Science and Technology Facilities Council,United Kingdom Department of Energy (DOE) [DE-AC02-07CH11359] National Science Foundation (NSF) [0450696] Grainger Foundation USA ALFA-EC/HELEN European Union [MEIF-Cr-2005-025057] UNESCO |
Identificador |
ASTROPARTICLE PHYSICS, AMSTERDAM, v.31, n.6, p.399-406, JUL, 2009 0927-6505 http://producao.usp.br/handle/BDPI/29939 10.1016/j.astropartphys.2009.04.003 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV AMSTERDAM |
Relação |
Astroparticle Physics |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #EXTENSIVE AIR-SHOWERS #FLUORESCENCE #PROFILES #DETECTOR #Astronomy & Astrophysics #Physics, Particles & Fields |
Tipo |
article original article publishedVersion |