2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

Anisotropies of ultra-high energy cosmic rays diffusing from extragalactic sources

5 Jul 2014, 16:08
19m
Auditorium 3A ()

Auditorium 3A

Oral presentation Astroparticle Physics and Cosmology Astroparticle Physics and Cosmology

Speaker

Dr. Silvia MOLLERACH (CONICET, Centro Atomico Bariloche)

Description

The large angular scale distribution of UHECRs is expected to become an important tool to infer CR properties in the near future, as a considerable statistics is being gathered by the Pierre Auger and TA observatories. Here we obtain the dipolar anisotropy of cosmic crays diffusing from nearby extragalactic sources. We discuss both the energy regime of spatial diffusion and the quasi-rectilinear one leading to just angular diffusion at higher energies. We obtain analytic results for the anisotropies from a single source which are validated using 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 non-isotropic source distribution is also discussed, showing that it can significantly affect the observed dipole.

Primary author

Dr. Silvia MOLLERACH (CONICET, Centro Atomico Bariloche)

Co-authors

Dr. Diego Harari (CONICET) Dr. Esteban Roulet (CONICET)

Presentation Materials

Paper

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