How can we explain last UHERC anisotropies?

TL;DR

This paper analyzes recent ultra-high-energy cosmic ray data, suggesting they are mainly light nuclei, explaining observed anisotropies and source distributions, and confirming previous hypotheses about their composition and origins.

Contribution

It confirms that UHECRs at 40-70 EeV are primarily light nuclei and explains anisotropies and source absence through their fragility and opacity, supporting earlier claims.

Findings

UHECRs at 40-70 EeV are mostly light nuclei.

Virgo absence and localized sources are explained by nuclei fragility.

Recent anisotropy in composition supports previous hypotheses.

Abstract

We consider the recent results on UHECR (Ultra High Energy Cosmic Ray), clustering, composition, distribution in the sky, from the energy of several EeV with the dipole anisotropy up to the highest ones. We have suggested since 2008 and we reconfirm here that UHECR at 40 up to 70 EeV are mostly made by light and lightest nuclei. The remarkable Virgo absence and the few localized nearby extragalactic sources as CenA, NG 253, M82 may be well understood by the lightest nuclei fragility and opacity within Mpc distances. We comment also on the role of a few galactic UHECR sources at ten EeV that may be partially feeding the Auger dipole UHECR anisotropy. The recent anisotropy in the UHECR spectral composition of lightest and heavy nuclei, outside and along the galactic plane, could also be a first confirmation of our previous claims (2012). The interplay of the heavier and most energetic UHECR galactic nuclei with the mainly local (Mpcs) extragalactic signals ruled by lightest nuclei, seems to fit the main pieces of UHECR puzzle.