The need for hard spectra sources of nearby heavy cosmic rays
ISDC, University of Geneva, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
Using recent Auger energy spectrum and composition analysis results, an investigation is carried out into the requirements placed on the UHECR sources. The the spatial distribution of these sources is investigated along with the energy distribution of UHECR they output. These investigations reveal the need for local UHECR sources which output a hard spectrum of intermediate/heavy UHECR. These results demand that local (<80 Mpc) UHECR sources exist, placing exciting and difficult requirements on the local extragalactic candidate sources. None negligible (>0.01 nG) extragalactic magnetic fields are noted to further strengthen these results.
© Owned by the authors, published by EDP Sciences, 2013
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