Clustering of ultra-high energy cosmic ray arrival directions on medium scales
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 n...
| Main Authors: | , |
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| Language: | English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://cds.cern.ch/record/918192 |
| Summary: | 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 and the angular scale might be interpreted as first signature of the large-scale structure of UHECR sources and of intervening magnetic fields. |
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