Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2011
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Resumo |
The Pierre Auger Collaboration has reported. evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > E(th) = 5.5 x 10(19) eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at E > E(th) are heavy nuclei with charge Z, the proton component of the sources should lead to excesses in the same regions at energies E/Z. We here report the lack of anisotropies in these directions at energies above E(th)/Z (for illustrative values of Z = 6, 13, 26). If the anisotropies above E(th) are due to nuclei with charge Z, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies. Comision Nacional de Energia Atomica Comision Nacional de Energia Atomica Fundacion Antorchas Fundacion Antorchas Gobierno De La Provincia de Mendoza Gobierno De La Provincia de Mendoza Municipalidad de Malargue Municipalidad de Malargue NDM Holdings NDM Holdings Valle Las Lenas Valle Las Lenas Australian Research Council (ARC) Australian Research Council Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Financiadora de Estudos e Projetos (FINEP) Financiadora de Estudos e Projetos (FINEP) Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Ministério da Ciência, Tecnologia e Inovação do Brasil (MCTI) Ministerio de Ciencia e Tecnologia (MCT), Brazil Academy of Sciences of the Czech Republic (AVCR) AVCR, Czech Republic[AV0Z10100502] AVCR, Czech Republic[AV0Z10100522] Academy of Sciences of the Czech Republic (AVCR) AVCR, Czech Republic[GAAV KJB300100801] Academy of Sciences of the Czech Republic (AVCR) AVCR, Czech Republic[KJB100100904] Academy of Sciences of the Czech Republic (AVCR) Academy of Sciences of the Czech Republic (AVCR) AVCR, Czech Republic[MSMT-CR LA08016] AVCR, Czech Republic[LC527] Academy of Sciences of the Czech Republic (AVCR) Academy of Sciences of the Czech Republic (AVCR) AVCR, Czech Republic[1M06002] AVCR, Czech Republic[MSM0021620859] Academy of Sciences of the Czech Republic (AVCR) Centre de Cal-cul[IN2P3/CNRS] Centre de Calcul Centre National de la Recherche Scientifique (CNRS) Centre National de la Recherche Scientifique (CNRS) Conseil Regional Ile-de-France Conseil Regional Ile-de-France Departement Physique Nucleaire et Corpusculaire Departement Physique Nucleaire et Corpusculaire[PNC-IN2P3/CNRS] Departement Sciences de l`Univers (SDU-INSU/CNRS), France Departement Sciences de l`Univers (SDU-INSU/CNRS), France Bundesministeriums für Bildung und Forschung (BMBF) Bundesministerium fur Bildung und Forschung (BMBF) Deutsche Forschungsgemeinschaft (DFG) Deutsche Forschungsgemeinschaf (DFG) Finanzministerium Baden-Wurttemberg Finanzministerium Baden-Wurttemberg Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF) Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF) Ministerium fur Wissenschaft rind Forschung Ministerium fur Wissenschaft rind Forschung Nordrhein-Westfalen Nordrhein-Westfalen Ministerium fur Wissenschaft Ministerium fur Wissenschaft Forschung und Kunst Forschung und Kunst Baden-Wurttemberg, Germany Istituto Nazionale di Fisica Nuclear (INFN) Istituto Nazionale di Fisica Nucleare (INFN) Istituto Nazionale di Astrofisica (INAF) Istituto Nazionale di Astrofisica (INAF) Minister dell`Istruzione Ministero dell`Istruzione dell`Universita e della Ricerca (MIUR) Ministero dell Istruzione, dell Università e della Ricerca della Itália (MIUR) Gran Sasso Center for Astroparticle Physics (CFA), Italy Gran Sasso Center for Astroparticle Physics (CFA), Italy Consejo Nacional de Ciencia y Tecnología (CONACYT) - México Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico Ministerie an Onderwijs Ministerie an Onderwijs Cultuur en Wetenschap Cultuur en Wetenschap Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) Foundation for Fundamental Research on Matter (FOM) Stichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands Ministry of Science and Higher Education, Poland[1 P03 D 014 30] Ministry of Science and Higher Education, Poland Ministry of Science and Higher Education, Poland[N N202 207238] Ministry of Science and Higher Education, Poland Fundacao para a Ciencia e a Tecnologia (FCT), Portugal Fundacao para a Ciencia e a Tecnologia (FCT), Portugal Ministry for Higher Education, Science, and Technology, Slovenian Research Agency, Slovenia Ministry for Higher Education, Science, and Technology, Slovenian Research Agency, Slovenia Comunidad de Madrid, Spain Comunidad de Madrid, Spain Consejeria de Educacion de la Comunidad de Castilla La Mancha Consejeria de Educacion de la Comunidad de Castilla La Mancha Fondo Europeo de Desarrollo Regional (FEDER) FEDER Ministerio de Ciencia e Innovacion and Consolider-Ingenio (CPAN) Ministerio de Ciencia e Innovacion and Consolider-Ingenio (CPAN) Generalitat Valenciana Generalitat Valenciana Junta de Andalucia Junta de Andalucia (Spain) Xunta de Galicia, Spain Xunta de Galicia, Spain Science and Technology Facilities Council, United Kingdom Science and Technology Facilities Council, United Kingdom Department of Energy (DOE)[DE-AC02-07CH11359] U.S. Department of Energy (DOE) Department of Energy (DOE)[DE-FR02-04ER41300] U.S. Department of Energy (DOE) National Science Foundation (NSF)[0969100] U.S. National Science Foundation (NSF) Grainger Foundation USA Grainger Foundation USA NAFOSTED, Vietnam NAFOSTED, Vietnam ALFA-EC/HELEN ALFA-EC / HELEN European Union European Union[MEIF-CT-2005-025057] European Union European Union[PIEF-GA-2008-220240] United Nations Educational, Scientific and Cultural Organization (UNESCO) UNESCO |
Identificador |
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, n.6, 2011 1475-7516 http://producao.usp.br/handle/BDPI/29948 10.1088/1475-7516/2011/06/022 |
Idioma(s) |
eng |
Publicador |
IOP PUBLISHING LTD |
Relação |
Journal of Cosmology and Astroparticle Physics |
Direitos |
restrictedAccess Copyright IOP PUBLISHING LTD |
Palavras-Chave | #ultra high energy cosmic rays #cosmic ray experiments #ACTIVE GALACTIC NUCLEI #SPECTRUM #DETECTOR #Astronomy & Astrophysics #Physics, Particles & Fields |
Tipo |
article original article publishedVersion |