First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies

作者：Michihiro AMENOMORI, Y. W. Bao, Xiao-Jun Bi, D. Chen, T. L. Chen, Wen‐Yun Chen, Xu Chen, Yang Chen, Cirennima, S. W. Cui, Danzengluobu Danzengluobu, L. K. Ding, J. Fang, Kun Fang, C. Feng, Zhaoyang Feng, Zhao-Qing Feng, Qi Gao, Q. B. Gou, Y. Q. Guo, Y. Y. Guo, H. H. He, Z. T. He, Kinya Hibino, Naoki Hotta, Haibing Hu, H. B. Hu, Jiaheng Huang, H. Y. Jia, Long Jiang, H.-B. Jin, K. Kasahara, Y. Katayose, Chihiro Kato, Shinsuke Kato, K. Kawata, Wataru Kihara, Y. Ko, M. Kozai, Labaciren Labaciren, G. M. Le, A. F. Li, H. J. Li, Wenjuan Li, Y. H. Lin, Jianwei Liu, Chunhong Liu, J. S. Liu, M. Y. Liu, Wei Liu, Y.‐Q. Lou, Hong Laura Lu, X. R. Meng, Kazuoki Munakata, Hitoshi Nakada, Yuya Nakamura, Hajime Nanjo, M. Nishizawa, M. Ohnishi, T. Ohura, S. Ozawa, X. L. Qian, X. B. Qu, T. Saito, M. Sakata, T. Sako, Jia-Dong Shao, M. Shibata, Atsushi Shiomi, H. Sugimoto, Wakiko Takano, M. Takita, Y. H. Tan, N. Tateyama, S. Torii, H. Tsuchiya, S. Udo, Han Wang, H. R. Wu, L. Xue, Y. Yamamoto, Z. Yang, Yoshichika Yokoe, A. F. Yuan, L. M. Zhai, H. M. Zhang, J. L. Zhang, Xiang Zhang, X. Y. Zhang, Yi Zhang, Yi Zhang, Ying Zhang, S. P. Zhao, Zhaxisangzhu, Xiaojuan Zhou · 发表于：Physical Review Letters · 年份：2021 · DOI：10.1103/physrevlett.126.141101 · 被引用次数：234 · 研究领域：Astrophysics and Cosmic Phenomena、Dark Matter and Cosmic Phenomena、Gamma-ray bursts and supernovae

We report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. Particularly, all gamma rays above 398 TeV are observed apart from known TeV gamma-ray sources and compatible with expectations from the hadronic emission scenario in which gamma rays originate from the decay of π^{0}'s produced through the interaction of protons with the interstellar medium in the Galaxy. This is strong evidence that cosmic rays are accelerated beyond PeV energies in our Galaxy and spread over the Galactic disk.