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arxiv: 1906.05521 · v1 · pith:RH32MCX6new · submitted 2019-06-13 · 🌌 astro-ph.HE

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

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

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