The anisotropy of cosmic ray arrival directions around 10 18 eV

N Hayashida ,M Takeda ,K Kamata ,N Inoue ,Shigeru Yoshida ,T Yamamoto ,K Mase ,N Kawasumi ,Shigeyuki Kakizawa ,H Ohoka ,D Nishikawa ,M Sasano ,Y Matsubara ,Misao Sasaki ,Kazuaki Murakami ,Eiji Kusano ,K Honda ,S Osone ,M Teshima ,K Kadota ,R Torii ,Y Kawasaki ,Y Uchihori ,F Kakimoto ,M Nagano ,T Minagawa ,N Sakaki ,S Kawaguchi ,I Tsushima ,K Shinozaki ,H Yoshii

doi:10.1016/s0927-6505(98)00064-4

The anisotropy of cosmic ray arrival directions around 10 18 eV

N Hayashida , M Takeda + Show 29 more

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https://doi.org/10.1016/s0927-6505(98)00064-4

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Journal: Astroparticle Physics	Publication Date: May 1, 1999
Citations: 189

Affiliation: The University of Tokyo, Urawa University, Saitama University, University of Yamanashi, Hirosaki University, Nagoya University, Nagoya University of Foreign Studies, Tokyo Institute of Technology, Osaka City University, Ehime University

#Akeno Giant Air Shower Array #Arrival Directions Of Cosmic Rays + Show 8 more

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Abstract

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 114 000 showers observed over 11 years. In the first harmonic analysis, we have found a strong anisotropy of ∼ 4% around 10 18 eV, corresponding to a chance probability of ∼ 0.2% after taking the number of independent trials into account. 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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