Ultra–High Energy Cosmic Rays: Are They Isotropic?
Open Access
- 10 March 2001
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 549 (2) , 711-715
- https://doi.org/10.1086/319467
Abstract
From the analysis of Akeno Giant Air Shower Array (AGASA) data above 4 × 1019 eV, we show that the ultra-high energy cosmic ray flux is neither purely isotropic nor reflects the expected anisotropy from a pure source distribution that maps large-scale structure in the local universe. The arrival distribution seems to be the result of a mixture of fluxes (e.g., dark matter halo plus large-scale structure) or the superposition of direct and diffuse radiation field components, respectively. Another viable option is an arbitrary extragalactic flux reprocessed by a magnetized galactic wind model, as recently proposed in the literature.Keywords
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