Cluster analysis of extremely high energy cosmic rays in the northern sky

被引：154

作者：

Uchihori, Y ^{[1
]}

Nagano, M

Takeda, M

Teshima, M

Lloyd-Evans, J

Watson, AA

机构：

[1] Natl Inst Radiol Sci, Int Space Radiat Lab, Chiba 2638555, Japan

[2] Fukui Univ Technol, Dept Appl Phys & Chem, Fukui 9108505, Japan

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

[4] Univ Leeds, Dept Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

来源：

ASTROPARTICLE PHYSICS | 2000年 / 13卷 / 2-3期

关键词：

D O I：

10.1016/S0927-6505(99)00119-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The arrival directions of extremely high energy cosmic rays (EHECR) above 4 x 10(19) eV, observed by four surface array experiments in the northern hemisphere, are examined for coincidences from similar directions in the sky. The total number of cosmic rays is 92, A significant number of double coincidences (doublet) and triple coincidences (triplet) is observed on the supergalactic plane within the experimental angular resolution. The chance probability of such multiplets from a uniform distribution is less than 1% if we consider a restricted region within +/- 10 degrees of the supergalactic plane. Though there is still a possibility of chance coincidence, the present results on small angle clustering along the supergalactic plane may be important in interpreting EHECR enigma. An independent set of data is required to check our claims. (C) 2000 Elsevier Science B.V, All rights reserved.

引用

页码：151 / 160

页数：10

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