Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei

Details Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei

2008-04-02

arxiv.org/abs/0804.0382v2

Astropart.Phys.30:175-179,2008

Astronomy and Astrophysics

Astrophysics

13 pages, 1 table, 5 figures

Scientific paper

10.1016/j.astropartphys.2008.08.

We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays observed by the High Resolution Fly's Eye experiment and Active Galactic Nuclei (AGN) visible from its northern hemisphere location. No correlations, other than random correlations, have been found. We report our results using search parameters prescribed by the Pierre Auger collaboration. Using these parameters, the Auger collaboration concludes that a positive correlation exists for sources visible to their southern hemisphere location. We also describe results using two methods for determining the chance probability of correlations: one in which a hypothesis is formed from scanning one half of the data and tested on the second half, and another which involves a scan over the entire data set. The most significant correlation found occurred with a chance probability of 24%.

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