Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E ≥ 1019.2eV with the Telescope Array Surface Detector

被引：33

作者：

Abbasi, R. U. ^{[1
,2
]}

Abe, M. ^{[3
]}

Abu-Zayyad, T. ^{[1
,2
]}

Allen, M. ^{[1
,2
]}

Azuma, R. ^{[4
]}

Barcikowski, E. ^{[1
,2
]}

Belz, J. W. ^{[1
,2
]}

Bergman, D. R. ^{[1
,2
]}

Blake, S. A. ^{[1
,2
]}

Cady, R. ^{[1
,2
]}

Cheon, B. G. ^{[5
,6
]}

Chiba, J. ^{[7
]}

Chikawa, M. ^{[8
]}

Di Matteo, A. ^{[9
]}

Fujii, T. ^{[10
]}

Fujita, K. ^{[11
]}

Fukushima, M. ^{[10
,12
]}

Furlich, G. ^{[1
,2
]}

Goto, T. ^{[11
]}

Hanlon, W. ^{[1
,2
]}

Hayashi, M. ^{[13
]}

Hayashi, Y. ^{[11
]}

Hayashida, N. ^{[14
]}

Hibino, K. ^{[14
]}

Honda, K. ^{[15
]}

Ikeda, D. ^{[10
]}

Inoue, N. ^{[3
]}

Ishii, T. ^{[15
]}

Ishimori, R. ^{[4
]}

Ito, H. ^{[16
]}

Ivanov, D. ^{[1
,2
]}

Jeong, H. M. ^{[17
]}

Jeong, S. ^{[17
]}

Jui, C. C. H. ^{[1
,2
]}

Kadota, K. ^{[18
]}

Kakimoto, F. ^{[4
]}

Kalashev, O. ^{[19
]}

Kasahara, K. ^{[20
]}

Kawai, H. ^{[21
]}

Kawakami, S. ^{[11
]}

Kawana, S. ^{[3
]}

Kawata, K. ^{[10
]}

Kido, E. ^{[10
]}

Kim, H. B. ^{[5
,6
]}

Kim, J. H. ^{[1
,2
,22
]}

Kishigami, S. ^{[11
]}

Kitamura, S. ^{[4
]}

Kitamura, Y. ^{[4
]}

Kuzmin, V ^{[19
]}

Kuznetsov, M. ^{[19
]}

机构：

[1] Univ Utah, High Energy Astrophys Inst, Salt Lake City, UT 84112 USA

[2] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[3] Saitama Univ, Grad Sch Sci & Engn, Saitama, Saitama, Japan

[4] Tokyo Inst Technol, Grad Sch Sci & Engn, Meguro Ku, Tokyo, Japan

[5] Hanyang Univ, Dept Phys, Seoul, South Korea

[6] Hanyang Univ, Res Inst Nat Sci, Seoul, South Korea

[7] Tokyo Univ Sci, Dept Phys, Noda, Chiba, Japan

[8] Kindai Univ, Dept Phys, Higashi Osaka, Osaka, Japan

[9] Univ Libre Bruxelles, Serv Phys Theor, Brussels, Belgium

[10] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba, Japan

[11] Osaka City Univ, Grad Sch Sci, Osaka, Osaka, Japan

[12] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba, Japan

[13] Shinshu Univ, Informat Engn Grad Sch Sci & Technol, Nagano, Nagano, Japan

[14] Kanagawa Univ, Fac Engn, Yokohama, Kanagawa, Japan

[15] Univ Yamanashi, Interdisciplinary Grad Sch Med & Engn, Kofu, Yamanashi, Japan

[16] RIKEN, Astrophys Big Bang Lab, Wako, Saitama, Japan

[17] Sungkyunkwan Univ, Dept Phys, Suwon, South Korea

[18] Tokyo City Univ, Dept Phys, Setagaya Ku, Tokyo, Japan

[19] Russian Acad Sci, Inst Nucl Res, Moscow, Russia

[20] Waseda Univ, Adv Res Inst Sci & Engn, Shinjuku Ku, Tokyo, Japan

[21] Chiba Univ, Dept Phys, Chiba, Chiba, Japan

[22] Ulsan Natl Inst Sci & Technol, Sch Nat Sci, Dept Phys, UNIST Gil, Ulsan, South Korea

[23] Yonsei Univ, Dept Phys, Seoul, South Korea

[24] Shinshu Univ, Acad Assembly Sch, Sci & Technol Inst Engn, Nagano, Nagano, Japan

[25] Kochi Univ, Fac Sci, Kochi, Kochi, Japan

[26] Ritsumeikan Univ, Dept Phys Sci, Kusatsu, Shiga, Japan

[27] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia

[28] Rutgers Univ State Univ New Jersey, Dept Phys & Astron, Piscataway, NJ USA

[29] Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, Tokyo, Japan

[30] Osaka Electrocommun Univ, Fac Engn, Dept Engn Sci, Osaka, Osaka, Japan

[31] Hiroshima City Univ, Grad Sch Informat Sci, Hiroshima, Hiroshima, Japan

[32] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan

[33] Natl Inst Radiol Sci, Chiba, Chiba, Japan

[34] Czech Acad Sci, Cent European Inst Cosmol & Fundamental Phys, Inst Phys, Slovance 1999-2, Prague, Czech Republic

[35] Ewha Womans Univ, Dept Phys, Seoul, South Korea

[36] Ewha Womans Univ, Inst Early Universe, Seoul, South Korea

[37] Ehime Univ, Dept Phys, Matsuyama, Ehime, Japan

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 862卷 / 02期

基金：

新加坡国家研究基金会; 日本学术振兴会; 美国国家科学基金会;

关键词：

astroparticle physics; cosmic rays; large-scale structure of universe; MAGNETIC-FIELDS; ASTRONOMY;

D O I：

10.3847/1538-4357/aac9c8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Evidence for an intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays for energies greater than 10(19.2) eV in the northern hemisphere using 7 years of Telescope Array surface detector data. A relative energy distribution test is done comparing events inside oversampled spherical caps of equal exposure, to those outside, using the Poisson likelihood ratio. The center of maximum significance is at 9(h)16(m), 45 degrees, and has a deficit of events with energies 10(19.2) <= E < 10(19.75) eV and an excess for E >= 10(19.75) eV. The post-trial probability of this energy anisotropy, appearing by chance anywhere on an isotropic sky, is found by Monte Carlo simulation to be 9 x 10(-5) (3.74 sigma(global)).

引用

页数：6

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