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Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei

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Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei

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dc.contributor.author The Pierre Auger Collaboration
dc.contributor.author Pastor Carpi, Sergio
dc.contributor.author Pinto, Teguayco
dc.date.accessioned 2015-10-27T10:01:14Z
dc.date.available 2015-10-27T10:01:14Z
dc.date.issued 2008
dc.identifier.citation The Pierre Auger Collaboration Pastor Carpi, Sergio Pinto, Teguayco 2008 Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei Astroparticle Physics 29 3 188 204
dc.identifier.uri http://hdl.handle.net/10550/47919
dc.description.abstract Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the positions of relatively nearby active galactic nuclei (AGN). The correlation has maximum significance for cosmic rays with energy greater than ~ 6x10^19 eV and AGN at a distance less than ~ 75 Mpc. We have confirmed the anisotropy at a confidence level of more than 99% through a test with parameters specified a priori, using an independent data set. The observed correlation is compatible with the hypothesis that cosmic rays with the highest energies originate from extra-galactic sources close enough so that their flux is not significantly attenuated by interaction with the cosmic background radiation (the Greisen-Zatsepin-Kuz'min effect). The angular scale of the correlation observed is a few degrees, which suggests a predominantly light composition unless the magnetic fields are very weak outside the thin disk of our galaxy. Our present data do not identify AGN as the sources of cosmic rays unambiguously, and other candidate sources which are distributed as nearby AGN are not ruled out. We discuss the prospect of unequivocal identification of individual sources of the highest-energy cosmic rays within a few years of continued operation of the Pierre Auger Observatory.
dc.language.iso eng
dc.relation.ispartof Astroparticle Physics, 2008, vol. 29, num. 3, p. 188-204
dc.subject Física
dc.title Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
dc.type journal article es_ES
dc.date.updated 2015-10-27T10:01:14Z
dc.identifier.doi 10.1016/j.astropartphys.2008.01.002
dc.identifier.idgrec 043003
dc.rights.accessRights open access es_ES

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