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Effect of the Magnetic Horizon on the Combined Fit of the Pierre Auger Observatory Spectrum and Composition Data

by Juan Manuel Gonzalez on behalf of The Pierre Auger Collaboration

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Authors (as registered SciPost users):

Juan Manuel González

Abstract

We interpret the Pierre Auger Observatory's measurement of the energy spectrum and mass composition of cosmic rays with energies above $10^{17.8}$ eV as coming from two extragalactic source populations, one dominating the flux below a few EeV and the other above. Fitting the data neglecting magnetic fields, we find that the high-energy population is required to have a very hard injection spectrum, incompatible with the expectations from diffusive shock acceleration ($E^{-2}$). Turbulent magnetic fields between us and the closest sources can suppress the flux of low-rigidity particles, modifying the cosmic-ray spectrum at Earth. We include the effect of magnetic fields in the fit to the Auger data, which results in softer high-energy injection spectra.

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