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Amenomori, M.; Asano, S.; Bao, Y. W.; Bi, X. J.; Chen, D.; Chen, T. L.; Chen, W. Y.; Chen, Y.; Cirennima; Cui, S. W.; Danzengluobu; Fang, K.; Feng, C. F.; Feng, Zhaoyang; Gao, Qi; Gomi, A.; Gou, Q. B.; Guo, Y. Q.; Guo, Y. Y.; He, H. H.; Hibino, K.; Hotta, N.; Hu, Haibing; Hu, H. B.; Hu, K. Y.; Huang, J.; Jia, H. Y.; Jiang, L.; Jiang, P.; Jin, H. B.; Kasahara, K.; Katayose, Y.; Kato, S.; Kawashima, T.; Kawata, K.; Kozai, M.; Kurashige, D.; Labaciren; Li, A. F.; Li, H. J.; Li, W. J.; Li, Y.; Lin, Y. H.; Liu, B.; Liu, C.; Liu, L. Y.; Liu, M. Y.; Liu, W.; Liu, X. L.; Lou, Y.-Q.; Lu, H.; Meng, X. R.; Meng, Y.; Nagaya, K.; Nakamura, Y.; Nakazawa, Y.; Ning, C. C.; Nishizawa, M.; Ohnishi, M.; Okukawa, S.; Ozawa, S.; Qian, X.; Qian, X. L.; Qu, X. B.; Sakakibara, Y.; Sakata, M.; Sako, T.; Sako, T. K.; Shao, J.; Shiomi, A.; Sugimoto, H.; Takano, W.; Takita, M.; Tan, Y. H.; Tateyama, N.; Torii, S.; Udo, S.; Wang, H.; Wang, Y. P.; Wangdui; Wu, H. R.; Wu, Q.; Xu, J. L.; Xue, L.; Yang, Z.; Yao, Y. Q.; Yin, J.; Yokoe, Y.; Yu, N. P.; Yuan, A. F.; Zhai, L. M.; Zhang, C. P.; Zhang, H. M.; Zhang, J. L.; Zhang, X. Y.; Zhang, Y.; Zhang, Yi; Zhang, Ying; Zhaxisangzhu; Zhou, X. X.
Astrophysical journal/The Astrophysical journal, 06/2022, Volume: 932, Issue: 2Journal Article
Abstract HESS J1843–033 is a very high energy gamma-ray source whose origin remains unidentified. This work presents, for the first time, the energy spectrum of gamma rays beyond 100 TeV from the HESS J1843–033 region using the data recorded by the Tibet air shower array and its underground muon detector array. A gamma-ray source with an extension of 0.°34 ± 0.°12 is successfully detected above 25 TeV at ( α , δ ) = (281.°09 ± 0.°10, −3.°76 ± 0.°09) near HESS J1843–033 with a statistical significance of 6.2 σ , and the source is named TASG J1844–038. The position of TASG J1844–038 is consistent with those of HESS J1843–033, eHWC J1842–035, and LHAASO J1843–0338. The measured gamma-ray energy spectrum in 25 TeV < E < 130 TeV is described with dN / dE = ( 9.70 ± 1.89 ) × 10 − 16 ( E /40 TeV) −3.26±0.30 TeV −1 cm −2 s −1 , and the spectral fit to the combined spectra of HESS J1843–033, LHAASO J1843–0338, and TASG J1844–038 implies the existence of a cutoff at 49.5 ± 9.0 TeV. Associations of TASG J1844–038 with SNR G28.6–0.1 and PSR J1844–0346 are also discussed in detail for the first time.
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