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Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory

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Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory

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dc.contributor.author The Pierre Auger Collaboration
dc.contributor.author Pastor Carpi, Sergio
dc.date.accessioned 2015-11-03T12:21:21Z
dc.date.available 2015-11-03T12:21:21Z
dc.date.issued 2011
dc.identifier.citation The Pierre Auger Collaboration Pastor Carpi, Sergio 2011 Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory Journal Of Cosmology And Astroparticle Physics 1106 06 022-1 022-17
dc.identifier.uri http://hdl.handle.net/10550/48017
dc.description.abstract The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E>Eth=5.5×10^19 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>Eth 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 Eth/Z (for illustrative values of Z=6,13,26). If the anisotropies above Eth 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.
dc.language.iso eng
dc.relation.ispartof Journal Of Cosmology And Astroparticle Physics, 2011, vol. 1106, num. 06, p. 022-1-022-17
dc.subject Física
dc.title Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
dc.type journal article es_ES
dc.date.updated 2015-11-03T12:21:21Z
dc.identifier.doi 10.1088/1475-7516/2011/06/022
dc.identifier.idgrec 069180
dc.rights.accessRights open access es_ES

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