Ultra-high energy cosmic rays may come from clustered sources

Details Ultra-high energy cosmic rays may come from clustered sources Ultra-high energy cosmic rays may come from clustered sources

1999-12-14

arxiv.org/abs/hep-ph/9912326v2

Astrophys.J. 542 (2000) 543-547

Physics

High Energy Physics

High Energy Physics - Phenomenology

Accepted for publication in Astrophysical Journal

Scientific paper

10.1086/317028

Clustering of cosmic-ray sources affects the flux observed beyond the cutoff imposed by the cosmic microwave background and may be important in interpreting the AGASA, Fly's Eye, and HiRes data. The standard deviation, sigma, in the predicted number, N, of events above 10^{20} eV is sigma/N = 0.9(r_0/10 Mpc)^{0.9}, where r_0 is the unknown scale length of the correlation function (r_0 = 10 Mpc for field galaxies). Future experiments will allow the determination of r_0 through the detection of anisotropies in arrival directions of ~ 10^{20} eV cosmic-rays over angular scales of Theta ~ r_0/30 Mpc.

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