Isotropy of Cosmic Rays beyond 1020 eV Favors Their Heavy Mass Composition

被引:2
作者
Abbasi, R. U. [1 ]
Abe, Y. [2 ]
Abu-Zayyad, T. [1 ,3 ,4 ]
Allen, M. [3 ,4 ]
Arai, Y. [5 ]
Arimura, R. [5 ]
Barcikowski, E. [3 ,4 ]
Belz, J. W. [3 ,4 ]
Bergman, D. R. [3 ,4 ]
Blake, S. A. [3 ,4 ]
Buckland, I [3 ,4 ]
Cheon, B. G. [6 ,7 ]
Chikawa, M. [8 ]
Fujii, T. [5 ,32 ]
Fujisue, K. [8 ,34 ]
Fujita, K. [8 ]
Fujiwara, R. [5 ]
Fukushima, M. [8 ]
Furlich, G. [3 ,4 ]
Globus, N. [9 ,35 ]
Gonzalez, R. [3 ,4 ]
Hanlon, W. [3 ,4 ]
Hayashida, N. [10 ]
He, H. [9 ,36 ]
Hibi, R. [2 ]
Hibino, K. [10 ]
Higuchi, R. [9 ]
Honda, K. [11 ]
Ikeda, D. [10 ]
Inoue, N. [12 ]
Ishii, T. [11 ]
Ito, H. [9 ]
Ivanov, D. [3 ,4 ]
Iwasaki, A. [5 ]
Jeong, H. M. [13 ]
Jeong, S. [13 ]
Jui, C. C. H. [3 ,4 ]
Kadota, K. [14 ]
Kakimoto, F. [10 ]
Kalashev, O. [15 ]
Kasahara, K. [16 ]
Kasami, S. [17 ]
Kawakami, S. [5 ]
Kawata, K. [8 ]
Kharuk, I [15 ]
Kido, E. [9 ]
Kim, H. B. [6 ,7 ]
Kim, J. H. [3 ,4 ,37 ]
Kim, S. W. [13 ,38 ]
Kimura, Y. [5 ]
机构
[1] Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA
[2] Shinshu Univ, Acad Assembly Sch Sci & Technol, Inst Engn, Nagano 3808554, Japan
[3] Univ Utah, High Energy Astrophys Inst, Salt Lake City, UT 84112 USA
[4] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
[5] Osaka Metropolitan Univ, Grad Sch Sci, Sumiyoshi, Osaka 5588585, Japan
[6] Hanyang Univ, Dept Phys, Seoul 426791, South Korea
[7] Hanyang Univ, Res Inst Nat Sci, Seoul 426791, South Korea
[8] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[9] RIKEN, Astrophys Big Bang Lab, Wako, Saitama 3510198, Japan
[10] Kanagawa Univ, Fac Engn, Yokohama, Kanagawa 2218686, Japan
[11] Univ Yamanashi, Interdisciplinary Grad Sch Med & Engn, Kofu, Yamanashi 4008511, Japan
[12] Saitama Univ, Grad Sch Sci & Engn, Saitama, Saitama 3388570, Japan
[13] SungKyunKwan Univ, Dept Phys, Suwon 16419, South Korea
[14] Tokyo City Univ, Dept Phys, Setagaya Ku, Tokyo 1588557, Japan
[15] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
[16] Shibaura Inst Technol, Fac Syst Engn & Sci, Minato Ku, Tokyo 3378570, Japan
[17] Osaka Electrocommun Univ, Grad Sch Engn, Hatsu Cho, Neyagawa, Osaka 5728530, Japan
[18] Univ Libre Bruxelles, Serv Phys Theor, B-1050 Brussels, Belgium
[19] Yonsei Univ, Dept Phys, Seoul 120749, South Korea
[20] Univ Nova Gorica, Ctr Astrophys & Cosmol, Nova Gorica 5297, Slovenia
[21] Kochi Univ, Fac Sci, Kochi, Kochi 7808520, Japan
[22] Ritsumeikan Univ, Dept Phys Sci, Kusatsu, Shiga 5258577, Japan
[23] Chubu Univ, Coll Engn, Kasugai, Aichi 4878501, Japan
[24] Natl Inst Informat & Commun Technol, Quantum ICT Adv Dev Ctr, Koganei, Tokyo 1848795, Japan
[25] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia
[26] Ulsan Natl Inst Sci & Technol, Sch Nat Sci, Dept Phys, Ulsan 689798, South Korea
[27] Tokyo Univ Sci, Dept Phys, Noda, Chiba 1628601, Japan
[28] Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, Tokyo 2778582, Japan
[29] Hiroshima City Univ, Grad Sch Informat Sci, Hiroshima, Hiroshima 7313194, Japan
[30] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 3050801, Japan
[31] Tokyo Inst Technol, Grad Sch Sci & Engn, Meguro Ku, Tokyo 1528550, Japan
[32] Osaka Metropolitan Univ, Nambu Yoichiro Inst Theoret & Expt Phys, Sumiyoshi, Osaka 5588585, Japan
[33] Czech Acad Sci, Inst Phys, CEICO, Prague 18221, Czech Republic
[34] Acad Sinica, Inst Phys, Taipei 115201, Taiwan
[35] Stanford Univ, KIPAC, Stanford, CA 94305 USA
[36] Purple Mt Observ, Nanjing 210023, Peoples R China
[37] Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA
[38] Korea Inst Geosci & Mineral Resources, Daejeon 34132, South Korea
[39] NASA, Marshall Space Flight Ctr, Huntsville, AL 35812 USA
基金
新加坡国家研究基金会; 美国国家科学基金会; 日本学术振兴会;
关键词
SURFACE DETECTOR; ENERGY-SPECTRUM; ARRAY;
D O I
10.1103/PhysRevLett.133.041001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report an estimation of the injected mass composition of ultrahigh energy cosmic rays (UHECRs) at energies higher than 10 EeV. The composition is inferred from an energy-dependent sky distribution of UHECR events observed by the Telescope Array surface detector by comparing it to the Large Scale Structure of the local Universe. In the case of negligible extragalactic magnetic fields (EGMFs), the results are consistent with a relatively heavy injected composition at E similar to 10 EeV that becomes lighter up to E similar to 100 EeV, while the composition at E > 100 EeV is very heavy. The latter is true even in the presence of highest experimentally allowed extragalactic magnetic fields, while the composition at lower energies can be light if a strong EGMF is present. The effect of the uncertainty in the galactic magnetic field on these results is subdominant.
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页数:8
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