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

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

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 wi...

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Veröffentlicht in:Physical review letters 2019-08, Vol.123 (5), p.051101-051101, Article 051101
Hauptverfasser: 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
Format: Artikel
Sprache:eng
Schlagworte:
Arrays
Background radiation
Cosmic ray showers
Crab nebula
Muons
Photons
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Beschreibung
Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.051101