The energy spectrum of cosmic rays measured by the Telescope Array using 10 years of fluorescence detector data

被引：10

作者：

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

Abe, Y. ^{[2
,3
]}

Abu-Zayyad, T. ^{[1
,4
,5
]}

Allen, M. ^{[4
,5
]}

Arai, Y. ^{[6
]}

Arimura, R. ^{[6
]}

Barcikowski, E. ^{[4
,5
]}

Belz, J. W. ^{[4
,5
]}

Bergman, D. R. ^{[4
,5
]}

Blake, S. A. ^{[4
,5
]}

Buckland, I. ^{[4
,5
]}

Cheon, B. G. ^{[7
,8
]}

Chikawa, M. ^{[9
]}

Fedynitch, A. ^{[9
,10
]}

Fujii, T. ^{[6
,11
]}

Fujisue, K. ^{[9
]}

Fujita, K. ^{[9
]}

Fujiwara, R. ^{[6
]}

Fukushima, M. ^{[9
]}

Furlich, G. ^{[4
,5
]}

Gerber, Z. ^{[4
,5
]}

Globus, N. ^{[12
,36
]}

Hanlon, W. ^{[4
,5
]}

Hayashida, N. ^{[13
]}

He, H. ^{[12
]}

Hibi, R. ^{[2
,3
]}

Hibino, K. ^{[13
]}

Higuchi, R. ^{[12
]}

Honda, K. ^{[14
]}

Ikeda, D. ^{[13
]}

Inoue, N. ^{[15
]}

Ishii, T. ^{[14
]}

Ito, H. ^{[12
]}

Ivanov, D. ^{[4
,5
]}

Iwasaki, A. ^{[6
]}

Jeong, H. M. ^{[16
]}

Jeong, S. ^{[16
]}

Jui, C. C. H. ^{[4
,5
]}

Kadota, K. ^{[17
]}

Kakimoto, F. ^{[13
]}

Kalashev, O. ^{[18
]}

Kasahara, K. ^{[19
]}

Kasami, S. ^{[20
]}

Kawakami, S. ^{[6
]}

Kawata, K. ^{[9
]}

Kharuk, I. ^{[18
]}

Kido, E. ^{[12
]}

Kim, H. B. ^{[7
,8
]}

Kim, J. H. ^{[4
,5
,37
]}

机构：

[1] Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA

[2] Shinshu Univ, Acad Assembly Sch Sci, Nagano, Nagano 3808554, Japan

[3] Shinshu Univ, Technol Inst Engn, Nagano, Nagano 3808554, Japan

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

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

[6] Osaka Metropolitan Univ, Grad Sch Sci, Osaka 5588585, Japan

[7] Hanyang Univ, Dept Phys, Seoul 426791, South Korea

[8] Hanyang Univ, Res Inst Nat Sci, Seoul 426791, South Korea

[9] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[10] Acad Sinica, Inst Phys, Taipei 115201, Taiwan

[11] Osaka Metropolitan Univ, Nambu Yoichiro Inst Theoret & Expt Phys, Osaka 5588585, Japan

[12] RIKEN, Astrophys Big Bang Lab, Wako, Saitama 3510198, Japan

[13] Kanagawa Univ, Fac Engn, Yokohama, Kanagawa 2218686, Japan

[14] Univ Yamanashi, Interdisciplinary Grad Sch Med & Engn, Kofu, Yamanashi 4008511, Japan

[15] Saitama Univ, Grad Sch Sci & Engn, Saitama, Saitama 3388570, Japan

[16] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea

[17] Tokyo City Univ, Dept Phys, Setagaya Ku, Tokyo 1588557, Japan

[18] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[19] Shibaura Inst Technol, Fac Syst Engn & Sci, Minato Ku, Tokyo 3378570, Japan

[20] Osaka Electrocommun Univ, Grad Sch Engn, Neyagawa, Osaka 5728530, Japan

[21] Univ Libre Bruxelles, Serv Phys Theor, B-1050 Brussels, Belgium

[22] Yonsei Univ, Dept Phys, Seoul 120749, South Korea

[23] Univ Nova Gorica, Ctr Astrophys & Cosmol, Nova Gorica 5297, Slovenia

[24] Kochi Univ, Fac Sci, Kochi, Kochi 7808520, Japan

[25] Ritsumeikan Univ, Dept Phys Sci, Shiga 5258577, Japan

[26] Chubu Univ, Coll Sci & Engn, Kasugai, Aichi 4878501, Japan

[27] Natl Inst Informat & Communicat Technol, Quantum ICT Adv Dev Ctr, Koganei, Tokyo 1848795, Japan

[28] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia

[29] Ulsan Natl Inst Sci & Technol, Sch Nat Sci, Dept Phys, UNIST Gil, Ulsan 689798, South Korea

[30] Tokyo Univ Sci, Dept Phys, Noda, Chiba 1628601, Japan

[31] Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, Tokyo 2778582, Japan

[32] Hiroshima City Univ, Grad Sch Informat Sci, Hiroshima, Hiroshima 7313194, Japan

[33] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 3050801, Japan

[34] Tokyo Inst Technol, Grad Sch Sci & Engn, Meguro, Tokyo 1528550, Japan

[35] Czech Acad Sci, Inst Phys, CEICO, Prague 18221, Czech Republic

[36] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[37] Argonne Natl Lab, Div Phys, Lemont, IL 60439 USA

[38] Georgia Inst Technol, Dept Phys, Atlanta, GA 30332 USA

来源：

ASTROPARTICLE PHYSICS | 2023年 / 151卷

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：

Ultra-high energy cosmic rays; Telescope array experiment; Cosmic ray energy spectrum; Spectral features; Monocular reconstruction; GZK suppression; SHOWERS;

D O I：

10.1016/j.astropartphys.2023.102864

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Telescope Array (TA) Cosmic Ray Observatory is the largest cosmic ray detector in the northern hemisphere. TA was built to study ultra-high-energy cosmic rays (UHECRs), cosmic rays with energies above 1018 eV. TA is a hybrid detector, employing two distinct detection methods: a surface detector array and a set of fluorescence telescopes. We will present a measurement of the cosmic ray energy spectrum for energies above 1017.5 eV using only the fluorescence telescopes. A novel weather classification scheme using machine learning was used to select data parts with good weather to ensure the quality of the fluorescence data. The data from the Black Rock Mesa (BRM) and Long Ridge (LR) fluorescence telescope sites were analyzed separately in monocular mode, with the calculated fluxes combined into a single spectrum. The 10-year monocular combined cosmic ray energy spectrum is observed to be in excellent agreement with previous measurements from the northern hemisphere. We present fits of the combined spectrum to a series of broken power law models. The thrice-broken power law was observed to be the best fit considering the Poisson deviance per degrees of freedom. The three breaks suggest an additional feature of the spectrum between the previously observed Ankle feature at 1018.7 eV and the GZK suppression at 1019.8 eV.

引用

页数：17