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Large scale distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory

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	The Pierre Auger Collaboration; Pastor Carpi, Sergio
	This document is a artículoDate2012
	Este documento está disponible también en : http://hdl.handle.net/10550/48019
	A thorough search for large scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10<sup>18</sup> 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 10<sup>18</sup> 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 challenge an origin of cosmic rays above 10<sup>18</sup> eV from stationary galactic sources densely distributed in the galactic disk and emitting predominantly light particles in all directions.
	The Pierre Auger Collaboration Pastor Carpi, Sergio 2012 Large scale distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory Astrophysical Journal Supplement Series 203 2 34-1 34-49
	http://dx.doi.org/10.1088/0067-0049/203/2/34