Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2010
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Resumo |
Data collected by the Pierre Auger Observatory through 31 August 2007 showed evidence for anisotropy in the arrival directions of cosmic rays above the Greisen-Zatsepin-Kuz`min energy threshold, 6 x 10(19) eV. The anisotropy was measured by the fraction of arrival directions that are less than 3.1 degrees from the position of an active galactic nucleus within 75 Mpc (using the Veron-Cetty and Veron 12th catalog). An updated measurement of this fraction is reported here using the arrival directions of cosmic rays recorded above the same energy threshold through 31 December 2009. The number of arrival directions has increased from 27 to 69, allowing a more precise measurement. The correlating fraction is (38(-6)(+7))%, compared with 21% expected for isotropic cosmic rays. This is down from the early estimate of (69-(+11)(13))%. The enlarged set of arrival directions is examined also in relation to other populations of nearby extragalactic objects: galaxies in the 2 Microns All Sky Survey and active galactic nuclei detected in hard X-rays by the Swift Burst Alert Telescope. A celestial region around the position of the radiogalaxy Cen A has the largest excess of arrival directions relative to isotropic expectations. The 2-point autocorrelation function is shown for the enlarged set of arrival directions and compared to the isotropic expectation. (C) 2010 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 Valle Las Lenas, Argentina Australian Research Council (ARC) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Financiadora de Estudos e Projetos (FINEP) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Ministério da Ciência, Tecnologia e Inovação do Brasil (MCTI) Academy of Sciences of the Czech Republic [AVCR AV0Z10100502, AV0Z10100522, GAAV KJB300100801, KJB100100904, MSMT-CR LA08016, LC527, 1M06002, MSM0021620859] Centre de Calcul [IN2P3/CNRS], Centre National de la Recherche Scientifique (CNRS) Conseil Regional Ile-de-France, Departement Physique Nucleaire et Corpusculaire, France [PNC-IN2P3/CNRS] Departement Sciences de l`Univers, France [SDU-1NSU/CNRS] Bundesministeriums für Bildung und Forschung (BMBF) Deutsche Forschungsgemeinschaf (DFG) Finanzministerium Baden-Wurttemberg Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF) Ministerium fur Wissenschaft und Forschung, Nordrhein-Westfalen Ministerium fur Wissenschaft, Forschung und Kunst, Baden-Wurttemberg, Germany Istituto Nazionale di Fisica Nucleare (INFN) Istituto Nazionale di Astrofisica (INAF) Ministero dell Istruzione, dell Università e della Ricerca della Itália (MIUR) Consejo Nacional de Ciencia y Tecnología (CONACYT) - México Ministerie van Onderwijs, Cultuur en Wetenschap, Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) Stichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands Ministry of Science and Higher Education, Poland [1 P03 D 014 30, N N202 207238] Fundacao para a Ciencia 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 and Consolider-Ingenio 2010 (CPAN) Generalitat Valenciana Junta de Andalucia (Spain) Xunta de Galicia, Spain Science and Technology Facilities Council, United Kingdom Department of Energy (DOE)[DE-AC02-07CH11359, DE-FR02-04ER41300] National Science Foundation (NSF) [0450696] The Grainger Foundation USA ALFA-EC/ HELEN European Union [PIEF-GA-2008-220240] United Nations Educational, Scientific and Cultural Organization (UNESCO) |
Identificador |
ASTROPARTICLE PHYSICS, AMSTERDAM, v.34, n.5, p.314-326, DEC, 2010 0927-6505 http://producao.usp.br/handle/BDPI/30089 10.1016/j.astropartphys.2010.08.010 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV AMSTERDAM |
Relação |
Astroparticle Physics |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #Cosmic rays #UHECR #Anisotropy #Pierre Auger Observatory #Extra-galactic #GZK #ACTIVE GALACTIC NUCLEI #HIPASS CATALOG #GALAXIES #SPECTRUM #Astronomy & Astrophysics #Physics, Particles & Fields |
Tipo |
article original article publishedVersion |