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Search for clustering of ultra high energy cosmic rays from the Pierre Auger Observatory
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Search for clustering of ultra high energy cosmic rays from the Pierre Auger Observatory
Silvia Mollerach and the Pierre Auger Collaboration Pierre Auger Observatory, av. San Mart'in Norte 304, (5613) Malargüe, Argentina CONICET, Centro Atómico Bariloche, 8400 Bariloche, Rio Negro, Argentina Abstract. We present the results of a search for clustering among the highest energy events detected by the surface detector of the Pierre Auger Observatory between 1 January 2004 and 31 August 2007. We analyse the autocorrelation function, in which the number of pairs with angular separation within a given angle is compared with the expectation from an isotropic distribution. Performing a scan in energy above 30 EeV and in angles smaller than 30 degrees, the most significant excess of pairs appears for E > 57 EeV and for a wide range of separation angles, between 9 and 22 degrees. An excess like this has a chance probability of about 2% to arise from an isotropic distribution and appears at the same energy threshold at which the Pierre Auger Observatory has reported a correlation of the arrival directions of cosmic rays with nearby astrophysical objects.
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faster than light!
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