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

Understand

Earliest AUGER UHECR anisotropy correlated with AGN within a GZK Universe almost fade away.

• Recent UHECR mass compositions did show a negligible nucleon composition and an UHECR nuclei (light or heavy) signature.
• 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 composition.
• Because the light nuclei fragility such He UHECR cannot arrive from Virgo.