The anisotropy of cosmic ray arrival directions around 1018 eV

被引：208

作者：

Hayashida, N

Nagano, M

Nishikawa, D

Ohoka, H

Sakaki, N

Sasaki, M

Takeda, M

Teshima, M

Torii, R

Yamamoto, T

Yoshida, S

Honda, K

Kawasumi, N

Tsushima, I

Inoue, N

Kusano, E

Shinozaki, K

Souma, N

Kadota, K

Kakimoto, F

Kamata, K

Kawaguchi, S

Kawasaki, Y

Kitamura, H

Matsubara, Y

Murakami, K

Uchihori, Y

Yoshii, H

机构：

[1] Univ Tokyo, Inst Cosm Ray Res, Tokyo 1888502, Japan

[2] Yamanashi Univ, Fac Engn, Kofu, Yamanashi 4008511, Japan

[3] Yamanashi Univ, Fac Educ, Kofu, Yamanashi 4008510, Japan

[4] Saitama Univ, Dept Phys, Urawa, Saitama 3388570, Japan

[5] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan

[6] Nishina Mem Fdn, Tokyo 113, Japan

[7] Hirosaki Univ, Fac Gen Educ, Hirosaki, Aomori 0368560, Japan

[8] Osaka City Univ, Dept Phys, Osaka 5588585, Japan

[9] Kobe Univ, Dept Phys, Kobe, Hyogo 6578501, Japan

[10] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

[11] Nagoya Univ Foreign Studies, Aichi 4700197, Japan

[12] Natl Inst Radiol Sci, Chiba 2638555, Japan

[13] Ehime Univ, Dept Phys, Matsuyama, Ehime 7908577, Japan

来源：

ASTROPARTICLE PHYSICS | 1999年 / 10卷 / 04期

关键词：

cosmic ray; anisotropy; galactic magnetic field; air shower;

D O I：

10.1016/S0927-6505(98)00064-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 4% around 10(18) eV, corresponding to a chance probability of similar to 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. (C) 1999 Elsevier Science B.V.

引用

页码：303 / 311

页数：9

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