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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/14880

Title: Large-scale distribution of arrival directions of cosmic rays detected above 1018 ev at the pierre auger observatory
Other Titles: Astrophysical Journal
Authors: Pepe, Iuri Muniz
Abreu, P.
Aglietta, M.
Ahlers, M.
Ahn, E. J.
Albuquerque, Ivone Freire da Mota e
Allard, D.
Allekotte, I.
Allen, J.
Keywords: Astroparticle physics;Cosmic rays
Issue Date: 2012
Abstract: A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory is presented. This search is performed as a function of both declination and right ascension in several energy ranges above 1018 eV, and reported in terms of dipolar and quadrupolar coefficients. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Assuming that any cosmic-ray anisotropy is dominated by dipole and quadrupole moments in this energy range, upper limits on their amplitudes are derived. These upper limits allow us to test the origin of cosmic rays above 1018 eV from stationary Galactic sources densely distributed in the Galactic disk and predominantly emitting light particles in all directions.
Description: p. 1-20
URI: http://repositorio.ufba.br/ri/handle/ri/14880
ISSN: 0004-637X
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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