Clustering of ultra-high energy cosmic ray arrival directions on medium scales

Details Clustering of ultra-high energy cosmic ray arrival directions on medium scales Clustering of ultra-high energy cosmic ray arrival directions on medium scales

2005-12-20

arxiv.org/abs/astro-ph/0512498v2

Astropart.Phys.26:10-15,2006

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures; v2: added discussion of penalty factor and experimental exposures

Scientific paper

10.1016/j.astropartphys.2006.04.

The two-point autocorrelation function of ultra-high energy cosmic ray (UHECR) arrival directions has a broad maximum around 25 degrees, combining the data with energies above $4\times 10^{19}$ eV (in the HiRes energy scale) of the HiRes stereo, AGASA, Yakutsk and SUGAR experiments. This signal is not or only marginally present analyzing events of a single experiment, but becomes significant when data from several experiments are added. Both the energy dependence of the signal and its angular scale might be interpreted as first signatures of the large-scale structure of UHECR sources and of intervening magnetic fields.

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