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Constraints
on the origin of cosmic rays above 1018 eV from large
scale anisotropy searches in data of the Pierre Auger
Observatory
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 reported. For the first time,
these large scale anisotropy searches are performed as a function of
both the right ascension and the declination and expressed in
terms of dipole and quadrupole moments. Within the systematic
uncertainties, no significant deviation from isotropy is
revealed. Upper limits on dipole and quadrupole amplitudes are
derived under the hypothesis that any cosmic ray anisotropy
is dominated by such moments in this energy range. These
upper limits provide constraints on the production of cosmic rays
above 1018 eV, since they allow us to challenge
an origin from stationary galactic sources densely distributed
in the galactic disk and emitting predominantly light particles in
all directions.
Télécharger l’article : http://arxiv.org/pdf/1212.3083.pdf
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