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Isotropy of Cosmic Rays beyond 1020 eV Favors Their Heavy Mass Composition
- Authors
- Abbasi, R.U.; Abe, Y.; Abu-Zayyad, T.; Allen, M.; Arai, Y.; Arimura, R.; Barcikowski, E.; Belz, J.W.; Bergman, D.R.; Blake, S.A.; Buckland, I.; Cheon, B.G.; Chikawa, M.; Fujii, T.; Fujisue, K.; Fujita, K.; Fujiwara, R.; Fukushima, M.; Furlich, G.; Globus, N.; Gonzalez, R.; Hanlon, W.; Hayashida, N.; He, H.; Hibi, R.; Hibino, K.; Higuchi, R.; Honda, K.; Ikeda, D.; Inoue, N.; Ishii, T.; Ito, H.; Ivanov, D.; Iwasaki, A.; Jeong, H.M.; Jeong, S.; Jui, C.C.H.; Kadota, K.; Kakimoto, F.; Kalashev, O.; Kasahara, K.; Kasami, S.; Kawakami, S.; Kawata, K.; Kharuk, I.; Kido, E.; Kim, H.B.; Kim, J.H.; Kim, J.H.; Kim, S.W.; Kimura, Y.; Komae, I.; Kuzmin, V.; Kuznetsov, M.; Kwon, Y.J.; Lee, K.H.; Lubsandorzhiev, B.; Lundquist, J.P.; Matsumiya, H.; Matsuyama, T.; Matthews, J.N.; Mayta, R.; Mizuno, K.; Murakami, M.; Myers, I.; Lee, K.H.; Nagataki, S.; Nakai, K.; Nakamura, T.; Nishio, E.; Nonaka, T.; Oda, H.; Ogio, S.; Onishi, M.; Ohoka, H.; Okazaki, N.; Oku, Y.; Okuda, T.; Omura, Y.; Ono, M.; Oshima, A.; Oshima, H.; Ozawa, S.; Park, I.H.; Park, K.Y.; Potts, M.; Pshirkov, M.S.; Remington, J.; Rodriguez, D.C.; Rott, C.; Rubtsov, G.I.; Ryu, D.; Sagawa, H.; Saito, R.; Sakaki, N.; Sako, T.; Sakurai, N.; Sato, D.; Sato, K.; Sato, S.; Sekino, K.; Shah, P.D.; Shibata, N.; Shibata, T.; Shikita, J.; Shimodaira, H.; Shin, B.K.; Shin, H.S.; Shinto, D.; Smith, J.D.; Sokolsky, P.; Stokes, B.T.; Stroman, T.A.; Takagi, Y.; Takahashi, K.; Takamura, M.; Takeda, M.; Takeishi, R.; Taketa, A.; Takita, M.; Tameda, Y.; Tanaka, K.; Tanaka, M.; Tanoue, Y.; Thomas, S.B.; Thomson, G.B.; Tinyakov, P.; Tkachev, I.; Tokuno, H.; Tomida, T.; Troitsky, S.; Tsuda, R.; Tsunesada, Y.; Udo, S.; Urban, F.; Warren, D.; Wong, T.; Yamazaki, K.; Yashiro, K.; Yoshida, F.; Zhezher, Y.; Zundel, Z.
- Issue Date
- Jul-2024
- Publisher
- American Physical Society
- Citation
- Physical Review Letters, v.133, no.4, pp 1 - 8
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- Physical Review Letters
- Volume
- 133
- Number
- 4
- Start Page
- 1
- End Page
- 8
- ISSN
- 0031-9007
1079-7114
- Abstract
- 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∼10 EeV that becomes lighter up to E∼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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Related Researcher
- Kim, Hang Bae
- COLLEGE OF NATURAL SCIENCES (DEPARTMENT OF PHYSICS)