Coherent and random UHECR spectroscopy of lightest nuclei along CenA: Shadows on GZK tau neutrinos spread in a near sky and time

Since the earliest UHECR anisotropy findings [2] till today, recent ICRC09 AUGER [1] updated maps and clustering confirm our understanding of Centaurus A (NGC 5128), Cen A, as the main nearby UHECR source, whose events are mostly lightest nuclei, such as He. The events are spread by galactic fields. The main UHECR events along Cen A spread vertically (with respect to horizontal spiral galactic fields) by random (and a final coherent) Lorentz forces. The He-nuclei dominance is also well probed by detailed AUGER composition data. The lightest nuclei are still compatible with the most recent HIRES composition results. Such lightest UHECR nuclei are opaque even to the nearest Universe offering a very narrow local (10 Mpc) view. Explaining at best the otherwise puzzling Virgo persistent absence; therefore the He disruption should lead to halves energy tail clustering (along the same Cen A group), events of deuterium, He3 and protons (or unstable neutrons). They may rise in smeared cluster of events along the same Cen A group edges at energies among 1.5–4.5×1019 eV. The He-like UHECR photo-disruption should also produce energetic gamma (extremely opaque with CMB and therefore local and hard to detect in nosy knee CR) and GZK neutrinos at tens-hundred PeVs energy. Contrary to widely expected GZK νν at EeVs energy (due to its widely believed UHECR proton nature) our foreseen UHE neutrino by UHECR lightest nuclei, at tens-a hundred PeV, may rise in AUGER and TA telescopes via quite inclined (about 5°) upward fluorescent tau air-showers at nearest (1–4 km) horizons, at middle-low telescope view zenith angles (below 20°). Their air-showers will be opening and extending in widest azimuth angle (above 120°) and fastest angular velocity spread contrary to far EeV tau expected by popular GZK neutrinos. Even more hard to observe, these tau air-showers at tens and hundred PeVs may soon shine (in a peculiar way) at near telescope views and within a short (years) time, both in AUGER, HEAT and TA.