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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; Guo, Y Y; 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; Kasahara, K; Katayose, Y; Kato, C; Kato, S; Kawata, K; Kihara, W; Y Ko; 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; Liu, W; Y -Q Lou; H Lu; Meng, X R; Munakata, K; Nakada, H; Nakamura, Y; Nanjo, H; Nishizawa, M; Ohnishi, M; Ohura, T; Ozawa, S; Qian, X L; Qu, X B; Saito, T; Sakata, M; Sako, T K; Shao, J; Shibata, M; Shiomi, A; Sugimoto, H; Takano, W; Takita, M; Tan, Y H; Tateyama, N; Torii, S; Tsuchiya, H; Udo, S; Wang, H; Wu, H R; Xue, L; Yamamoto, Y; Yang, Z; Yokoe, Y; Yuan, A F; Zhai, L M; Zhang, H M; Zhang, J L; Zhang, X; Zhang, X Y; Zhang, Y; Zhang, Yi; Zhang, Ying; Zhao, S P; Zhaxisangzhu; Zhou, X X
arXiv.org, 09/2021Paper, Journal Article
Cosmic rays (protons and other atomic nuclei) are believed to gain energies of petaelectronvolts (PeV) and beyond at astrophysical particle accelerators called 'PeVatrons' inside our Galaxy. Although a characteristic feature of a PeVatron is expected to be a hard gamma-ray energy spectrum that extends beyond 100 teraelectronvolts (TeV) without a cutoff, none of the currently known sources exhibits such a spectrum due to the low maximum energy of accelerated cosmic rays or insufficient detector sensitivity around 100 TeV. Here we report the observation of gamma-ray emission from the supernova remnant G106.3+2.7 above 10 TeV. This work provides flux data points up to and above 100 TeV and indicates that the very-high-energy gamma-ray emission above 10 TeV is well correlated with a molecular cloud rather than the pulsar PSR J2229+6114. Regarding the gamma-ray emission mechanism of G106.3+2.7, this morphological feature appears to favor a hadronic origin via the {\pi}0 decay caused by accelerated relativistic protons over a leptonic one via the inverse-Compton scattering by relativistic electrons. Furthermore, we point out that an X-ray flux upper limit on the synchrotron spectrum would provide important information to firmly establish the hadronic scenario as the mechanism of particle acceleration at the source.
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in: SICRIS
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