2013/12/04 by Diego Harari, Silvia Mollerach, Esteban Roulet · 1 citation
Physics and Astronomy · #Anisotropic diffusion #Anisotropy #Astrophysics #Astrophysics and Cosmic Phenomena #Computational physics #Cosmic ray #Dark Matter and Cosmic Phenomena #Diffusion #Dipole #Isotropy #Neutrino Physics Research #Optics #Physics #Supercluster (genetic) #astro-ph.HE
paper · pdf · doi:10.1103/physrevd.89.123001
published as Phys. Rev. D 89, 123001 (2014)
arxiv created 2013/12/04 · openalex publication_date 2014/06/03 · arxiv updated 2014/06/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We obtain the dipolar anisotropies in the arrival directions of ultrahigh energy cosmic rays diffusing from nearby extragalactic sources. We discuss both the energy regime of spatial diffusion and the quasirectilinear one leading to just angular diffusion at higher energies. We obtain analytic results for the anisotropies from a single source, which are validated using two different numerical simulations. For a scenario with a few sources in the local supercluster (with the closest source at a typical distance of few to tens of Mpc), we discuss the possible transition between the case in which the anisotropies are dominated by a few sources at energies below few EeV towards the regime in which many sources contribute at higher energies. The effect of a nonisotropic source distribution is also discussed, showing that it can significantly affect the observed dipole.