Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-06-19
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
4 pages, 7 figures, ICRC2011
Scientific paper
UHECR mystery survived first Auger claims of AGN connection within a GZK (100 Mpc size) Universe. Last 2010 UHECR maps and compositions do show a much lower correlation with AGN SuperGalactic maps and with protons (the two main ingredient of that claim). The three main AUGER results that survived are: an embarrassing absence of Virgo cluster UHECR, somehow an expected signal; a steady presence of Cen-A clustering and a remarkable signature of nuclei (not nucleon) composition. We claim that the He-like lightest nuclei may solve most of the puzzle: He UHECR cannot arrive from Virgo because light nuclei fragility and opacity; Cen-A UHECR are spread (if He-Li-Be) as much as the observed ones; the light nuclei may fit well Auger composition signature as well as Hires spectra. Future multiplet of half energy UHECR (Eth/Z around 15-30 EeV) must trace in tails overlapping around some of higher UHECR spread . Their secondaries GZK neutrinos will crowd not at thousand PeV as GZK photopion foresee, but more at tens PeV observable maybe in ICECUBE and-or by horizontal tau airshowers in ARGO or by upward tau airshowers nearest to Auger and TA fluorescence telescopes.
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