The Anisotropy of Cosmic Ray Arrival Directions around 10$^{18}$eV

Details The Anisotropy of Cosmic Ray Arrival Directions around 10$^{18}$eV The Anisotropy of Cosmic Ray Arrival Directions around 10$^{18}$eV

1998-07-04

arxiv.org/abs/astro-ph/9807045v2

Astropart.Phys. 10 (1999) 303-311

Astronomy and Astrophysics

Astrophysics

17 pages with 16 figures, http://www.icrr.u-tokyo.ac.jp/~erina/English.html

Scientific paper

Anisotropy in the arrival directions of cosmic rays with energies above 10$^{17}$eV is studied using data from the Akeno 20 km$^2$ array and the Akeno Giant Air Shower Array (AGASA), using a total of about 117,000 showers observed during 11 years. In the first harmonic analysis, we have found strong anisotropy of $\sim$ 4% around 10$^{18}$eV, corresponding to a chance probability of 0.2%. With two dimensional analysis in right ascension and declination, this anisotropy is interpreted as an excess of showers near the directions of the Galactic Center and the Cygnus region.

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