Giuseppe Di Sciascio, Roberto Iuppa, for the ARGO-YBJ Collaboration
The measurement of the anisotropies of cosmic ray arrival direction provides
important informations on the propagation mechanisms and on the identification
of their sources. In this paper we report the observation of anisotropy regions
at different angular scales. In particular, the observation of a possible
anisotropy on scales between $\sim$ 10 $^{\circ}$ and $\sim$ 30 $^{\circ}$
suggests the presence of unknown features of the magnetic fields the charged
cosmic rays propagate through, as well as potential contributions of nearby
sources to the total flux of cosmic rays. Evidence of new weaker few-degree
excesses throughout the sky region $195^{\circ}\leq$ R.A. $\leq 315^{\circ}$ is
reported for the first time.
View original:
http://arxiv.org/abs/1112.0666
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