PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Observation of gamma rays from the northern celestial sky up to the sub-PeV range with the Tibet air shower array and its underground muon detector array
S. Kato*, M. Amenomori, Y.W. Bao, X.J. Bi, D. Chen, T.L. Chen, W.Y. Chen, X. Chen, Y. Chen, C. Cirennima, S.W. Cui, D. Danzengluobu, L. Ding, J.H. Fang, K. Fang, C.F. Feng, Z. Feng, Z.Y. Feng, Q. Gao, Q.B. Gou, Y.Q. Guo, Y. Hayashi, H.H. He, Z.T. He, K. Hibino, N. Hotta, H. Hu, H.B. Hu, K.Y. Hu, J. Huang, H.Y. Jia, L. Jiang, P. Jiang, H.B. Jin, K. Kasahara, Y. Katayose, C. Kato, S. Kato, I. Kawahara, T. Kawashima, K. Kawata, M. Kozai, L. Labaciren, G.M. Le, A.F. Li, H.J. Li, W.J. Li, Y. Li, Y.H. Lin, B. Liu, C. Liu, J.S. Liu, L.Y. Liu, M.Y. Liu, W. Liu, H. Lu, T. Makishima, Y. Masuda, S. Matsuhashi, M. Matsumoto, X.R. Meng, Y. Meng, A. Mizuno, K. Munakata, Y. Nakamura, H. Nanjo, C.C. Ning, M. Nishizawa, R. Noguchi, M. Ohnishi, S. Okukawa, S. Ozawa, X. Qian, X.B. Qu, T. Saito, M. Sakata, T. Sako, T. Sasaki, J. Shao, T. Shibasaki, M. Shibata, A. Shiomi, H. Sugimoto, W. Takano, M. Takita, Y.H. Tan, N. Tateyama, S. Torii, H. Tsuchiya, S. Udo, R. Usui, H. Wang, S.F. Wang, Y.P. Wang, W. Wangdui, H.R. Wu, Q. Wu, J.L. Xu, L. Xue, Z. Yang, Y.Q. Yao, J. Yin, Y. Yokoe, Y.L. Yu, A.F. Yuan, L.M. Zhai, H.M. Zhang, J.L. Zhang, X. Zhang, Y. Zhang, Y. Zhang, Y. Zhang, S.P. Zhao, Z. Zhaxisangzhu, X.X. Zhou and Y.H. Zouet al. (click to show)
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Pre-published on: July 25, 2023
Published on: —
Abstract
Gamma-ray observation in the sub-PeV range helps us search for Galactic PeV cosmic-ray accelerators, PeVatrons. Measurement of the energy spectrum of gamma rays from astrophysical sources is especially crucial to discuss their hadronic or leptonic origin. In this study, gamma rays from the sky region of HESS J1843−033 are observed by the Tibet air shower array equipped with the underground muon detector array. A new gamma-ray source TASG J1844−038 is detected above 25 TeV with a 6.2 𝜎 level in the region of interest, the position of which is consistent with HESS J1843−033, eHWC J1842−035, and LHAASO J1843−0338. The gamma-ray energy spectrum of TASG J1844−038 is successfully measured in 25−130 TeV for the first time; it smoothly connects to that of HESS J1843−033 and gives consistent flux levels with those of eHWC J1842−035 and LHAASO J1843−0338 at 56 and 100 TeV, respectively. The analysis of the combined gamma-ray spectra between the H.E.S.S., LHAASO, and TASG sources indicates the cutoff at about 50 TeV. The distribution of the molecular clouds around TASG J1844−038 is investigated by analyzing public CO line-emission data; our study finds the clouds in the velocity range of 75−95 km s^−1 lying flat over the region with a 50 K km s^−1 level. The association of the observed gamma rays with a nearby supernova remnant SNR G28.6−0.1 is discussed, and it is proposed that cosmic rays accelerated by SNR G28.6−0.1 up to about 500 TeV generate the observed gamma rays from the collisions with the ambient gas found in the analysis.
DOI: https://doi.org/10.22323/1.444.0627
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