First Detection of Photons with Energy beyond 100 TeV from an Astrophysical Source
Physical Review Letters2019Vol. 123(5), pp. 051101–051101
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M. Amenomori, Y. W. Bao, Xiao-Jun Bi, Dongying Chen, T. L. Chen, W. Y. Chen, Xu Chen, Yang Chen, Cirennima, S. W. Cui, Danzengluobu Danzengluobu, L. K. Ding, J. Fang, K. Fang, C. F. Feng, Zhaoyang Feng, Z. Y. Feng, Qi Gao, Q. B. Gou, Yafei Guo, Han He, Z. T. He, K. Hibino, N. Hotta, Haibing Hu, H. B. Hu, J. Huang, H. Y. Jia, Liang Jiang, H.-B. Jin, F. Kajino, K. Kasahara, Y. Katayose, C. Kato, Shinsuke Kato, K. Kawata, M. Kozai, Labaciren Labaciren, G. M. Le, A. F. Li, H. J. Li, Wenjuan Li, Y. H. Lin, Bing Liu, C. Liu, J. S. Liu, M. Y. Liu, Yuqing Lou, H. Lü, X. R. Meng, H. Mitsui, K. Munakata, Yoshiaki Nakamura, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, Seiji Ozawa, Xuan Qian, X. B. Qu, T. Saito, M. Sakata, T. Sako, Y. Sengoku, J. Shao, M. Shibata, A. Shiomi, H. Sugimoto, M. Takita, Y. H. Tan, N. Tateyama, Shuki Torii, Hiroshi Tsuchiya, S. Udo, Huan‐Yu Wang, H. R. Wu, L. Xue, K. Yagisawa, Y. Yamamoto, Z. Yang, A. F. Yuan, L. M. Zhai, H. M. Zhang, J. L. Zhang, X. Zhang, X. Y. Zhang, Y. ZHANG, Yi Zhang, Ying Zhang, Zhaxisangzhu, Xiaojuan Zhou
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 a 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 photonlike events with E>100 TeV against 5.5 background events, which corresponds to a 5.6σ statistical significance. This is the first detection of photons with E>100 TeV from an astrophysical source.
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