Apart Cen A are UHECR mostly heavy radioactive and galactic nuclei?

Abstract

Earliest AUGER (the Pierre Auger Observatory) UHECR (Ultra High Energy Cosmic Rays) anisotropy correlated with AGN (active galactic nuclei) within a GZK (Greisen-Zatsepin-Kuz'min cut off) Universe almost fade away. Recent UHECR mass compositions did show a negligible nucleon composition and an UHECR nuclei (light or heavy) signature. Indeed last map miss the Super-Galactic Plane. The absence of UHECR events toward the Virgo cluster, an unique spread clustering of events around Cen-A, our nearest AGN, suggested a He-like nuclei as the main extragalactic UHECR component from Cen A, coexisting with Auger and HIRES (High-Resolution Fly's Eye) composition. Because the light nuclei fragility such He UHECR cannot arrive from Virgo (being too far). Multiplet at twenty EeV along Cen A recently discovered by Auger confirm this interpretation as being foreseen to be indebt to fragments (D, He3,p) that had to reach us along the same UHECR. However remaining majority of UHECR clustering are partially correlated with a gamma noise at (1-3 MeV) in Comptel sky, linked to Al26 galactic radioactive map as well as to a few TeV gamma (ICECUBE-ARGO) anisotropy maps; rare UHECR triplet are overlapping on Vela TeV anisotropy and other nearest galactic gamma sources (as partially Crab and a Galactic core corona). Therefore UHECR might be also (or mostly) heavy radioactive galactic nuclei as Ni55, Ni56, Ni57 and Co57 bent from the sources whose β and γ radioactivity and decay in flight is boosted (by Lorentz factor ΓNi ≃ 109 − 108), leading to TeV correlated sky anisotropy. Galactic UHECR signals inside the inner center maybe suppressed by the largest spreading repulsive Lorentz bending forces. More clustering around external galactic plane is nevertheless expected in present and future data. Magellanic Cloud and Magellanic Stream may also rise more and more in UHECR maps (as well as in multiplet signals). Future UHECR clustering might be observed around Cas A and Cygnus by T.A. (Telescope Array). The UHECR spectra cut off may be not an extragalactic GZK feature but just the imprint of a galactic confinement and-or a spectroscopic heavy composition decrease step.