Possible origin of clusters in ultra-high-energy cosmic rays

Abstract

We estimate the detection rate of ultrahigh-energy cosmic rays on ground-based arrays by assuming that the cosmic-ray sources are active galactic nuclei. We analyze the cases of detection of clusters, several particles that arrived, within the error limits, from the same area of the sky. The adopted model is shown to explain the detection rate of clusters on the AGASA array.

Astrophysics in 2006

“…The highlight here is that, in preliminary fashion, Auger reports a flux on the low side of the range found by previous experiments, considerably alleviating the transport problem. Meanwhile, back in Utah (which we have so far not succeeded in moving to Nevada, though we suspect both places might benefit), 61 Japan, the Crimean peninsula, and so forth, there were several reports of correlated arrival directions, but not the same directions from any two detectors (Uryson 2005;Abbasi et al 2006;Farrar et al 2006).…”