Abstract
We investigate the possibility that observations of ultra-high-energy cosmic-rays (UHECRs) in the near future may be able to unveil their local source distribution. We simulate the arrival distribution of UHE protons taking account of their propagation process in intergalactic magnetic field (IGMF) associated with the local structure actually observed around the Milky Way and investigate the similarity of the spatial patterns between the arrival distribution and the source distribution. We find that UHE protons above 10 19.8 eV are the best indicators for unravelling the source distribution within 100 Mpc, and the detection of about 500 events on the whole sky would realize the purpose for plausible IGMF strength and source number density. We also discuss the deflection of the trajectories of UHE protons by the Galactic magnetic field (GMF). In favored GMF models, the deflection angles are consistent with the angular scale of the positional correlation reported by the Pierre Auger Observatory except in th...
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