Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-01-29
Nucl.Phys.Proc.Suppl.190:198-203,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Contribution to the Proceedings of the CRIS 2008 Conference
Scientific paper
10.1016/j.nuclphysbps.2009.03.08
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.
for the Pierre Auger Collaboration
Mollerach Silvia
No associations
LandOfFree
Search for clustering of ultra high energy cosmic rays from the Pierre Auger Observatory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Search for clustering of ultra high energy cosmic rays from the Pierre Auger Observatory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Search for clustering of ultra high energy cosmic rays from the Pierre Auger Observatory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-13730