Small-scale Anisotropy of Cosmic Rays above 1019 eV observed with AGASA

Details Small-scale Anisotropy of Cosmic Rays above 1019 eV observed with AGASA Small-scale Anisotropy of Cosmic Rays above 1019 eV observed with AGASA

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..276a&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

Arrival direction distribution of extremely high energy cosmic rays observed with the Akeno Giant Air Shower Array (AGASA) is examined. While no significant large-scale anisotropy is found on the celestial sphere, some interesting clusters of cosmic rays are observed. Above 4 × 1019 eV, there are one triplet and three doublets within separation angle of 2.5° and the probability of observing these clusters by a chance coincidence under an isotropic distribution is smaller than 1 %. Especially the triplet is observed against expected 0.05 events. Arrival direction distribution of seven 1020 eV cosmic rays is consistent with that of lower energy cosmic rays and is uniform. Three of seven are members of doublets above about 4 × 1019 eV.

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