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Título:
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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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Autores:
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Arganda, E. ;
Arqueros Martínez, Fernando ;
Blanco Ramos, Francisco ;
García Pinto, Diego ;
Ortiz Ramis, Montserrat ;
Rosado Vélez, Jaime ;
Vázquez Peñas, José Ramón
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Tipo de documento:
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texto impreso
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Editorial:
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IOP Publishing, 2011-06
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física nuclear
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Tipo = Artículo
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Resumen:
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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.
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En línea:
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https://eprints.ucm.es/id/eprint/38370/1/arqueros39preprint.pdf
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