First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical 
Source

Amenomori, M.; Bao, Y. W.; Bi, X. J.; Chen, D.; Chen, T. L.; Chen, W. Y.; Chen, Xu; Chen, Y.; Cirennima,; Cui, S. W.; Danzengluobu,; Ding, L. K.; Fang, J. H.; Fang, K.; Feng, C. F.; Feng, Zhaoyang; Feng, Z. Y.; Gao, Qi; Gou, Q. B.; Guo, Y. Q.; He, H. H.; He, Z. T.; Hibino, K.; Hotta, N.; Hu, Haibing; Hu, H. B.; Huang, J.; Jia, H. Y.; Jiang, L.; Jin, H. B.; Kajino, F.; Kasahara, K.; Katayose, Y.; Kato, C.; Kato, S.; Kawata, K.; Kozai, M.; Labaciren,; Le, G. M.; Li, A. F.; Li, H. J.; Li, W. J.; Lin, Y. H.; Liu, B.; Liu, C.; Liu, J. S.; Liu, M. Y.; Lou, Y. -Q.; Lu, H.; Meng, X. R.; Mitsui, H.; Munakata, K.; Nakamura, Y.; Nanjo, H.; Nishizawa, M.; Ohnishi, M.; Ohta, I.; Ozawa, S.; Qian, X. L.; Qu, X. B.; Saito, T.; Sakata, M.; Sako, T. K.; Sengoku, Y.; Shao, J.; Shibata, M.; Shiomi, A.; Sugimoto, H.; Takita, M.; Tan, Y. H.; Tateyama, N.; Torii, S.; Tsuchiya, H.; Udo, S.; Wang, H.; Wu, H. R.; Xue, L.; Yagisawa, K.; Yamamoto, Y.; Yang, Z.; Yuan, A. F.; Zhai, L. M.; Zhang, H. M.; Zhang, J. L.; Zhang, X.; Zhang, X. Y.; Zhang, Y.; Zhang, Yi; Zhang, Ying; Zhaxisangzhu,; Zhou, X. X.

doi:10.1103/PhysRevLett.123.051101

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First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical Source

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Shibata, M.
Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Citation

Amenomori, M., Bao, Y. W., Bi, X. J., Chen, D., Chen, T. L., Chen, W. Y., et al. (2019). First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical Source. Physical Review Letters, 123: 051101. doi:10.1103/PhysRevLett.123.051101.

Cite as: https://hdl.handle.net/21.11116/0000-0004-450D-1

Abstract

We report on the highest energy photons from the Crab Nebula observed by the
Tibet air shower array with the underground water-Cherenkov-type muon detector
array. Based on the criterion of muon number measured in an air shower, we
successfully suppress 99.92% of the cosmic-ray background events with energies
$E>100$ TeV. As a result, we observed 24 photon-like events with $E>100$ TeV
against 5.5 background events, which corresponds to 5.6$\sigma$ statistical
significance. This is the first detection of photons with $E>100$ TeV from an
astrophysical source.