Tracing protons through the Galactic magnetic field: a clue for charge composition of ultra-high energy cosmic rays

Abstract

We reconstruct the trajectories of ultra-high energy cosmic rays (UHECR) - observed by the AGASA experiment - in the Galactic magnetic field assuming that all particles have the same charge. We then study correlations between the reconstructed events and BL Lacs. The correlations have significance below 10^{-3} in the case of particles with charge +1. In the case of charge -1 the correlations are absent. We interpret this as evidence that protons are present in the flux of UHECR. Observed correlation provides an independent evidence that BL Lacs emit UHECR.

6 pages, 3 figures, LaTeX

References in corpus (2)

• Correlation function of ultra-high energy cosmic rays favors point sources
• Axion-like particles as ultra high energy cosmic rays?

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