Anisotropies of ultrahigh-energy cosmic rays in a scenario with nearby sources

Abstract

The images of ultrahigh-energy cosmic ray sources get distorted, in an energy dependent way, by the effects of Galactic and extragalactic magnetic fields. These deflections can also affect the observed cosmic ray spectrum, specially when the sources are transient. We study scenarios in which one or a few nearby extragalactic sources, such as Cen A or M81/M82, provide the dominant contribution to the cosmic ray flux above the ankle of the spectrum. We discuss the effects of the angular dispersion induced by the turbulent extragalactic magnetic fields, and the coherent deflections caused by the regular Galactic magnetic field, with the associated multiple imaging of the sources. We consider the possible contribution from those sources to the dipolar distribution discovered by the Pierre Auger Observatory above 8 EeV, as well as to the hot spots hinted in the observations by the Pierre Auger and Telescope Array observatories at higher energies, taking into account the mixed nature of the cosmic ray composition.

Explaining the UHECR spectrum, composition and large-scale anisotropies with radio galaxies

“…In addition, it is one of the brightest jetted AGN in terms of radio flux and has long been suggested as a likely UHECR source [16][17][18][19][20][21][22]. In recent years, there have been multiple observational hints [23,24], and model results [25][26][27] indicating that Centaurus A may be responsible for at least some fraction of the observed UHECR flux. Apart from Centaurus A, also Fornax A (NGC 1316) and Virgo A (NGC 4486) stand out in terms of their extraordinarily high radio flux in the local (< 21 Mpc) Universe.…”