Anisotropies of ultrahigh energy cosmic ray nuclei diffusing from extragalactic sources

D. HARARI; S. MOLLERACH; E. ROULET

PHYSICAL REVIEW D - PARTICLE AND FILDS

American Physical Society

Año: 2015 vol. 92

0556-2821

We obtain the dipolar anisotropies in the arrival directions ofultrahigh energy cosmic ray nuclei diffusing from nearby extragalacticsources. We consider mixed-composition scenarios in which differentcosmic ray nuclei are accelerated up to the same maximum rigidity, sothat E <Z Emaxp , with Z the atomic number andEmaxp the maximum proton energy. We adoptEmaxp≃6 EeV so as to account for anincreasingly heavy composition above the ankle. We obtain theanisotropies through Monte Carlo simulations that implement the cosmicray diffusion in extragalactic turbulent fields as well as the effectsof photodisintegrations and other energy losses. Dipolar anisotropies atthe level of 5% to 10% at energies ?10 EeV are predicted forplausible values of the source density and magnetic fields.