Measurement of the Gamma-Ray Energy Spectrum beyond 100 TeV from the HESS J1843$-$033 Region
Creators: name: Amenomori, M.
name: Asano, S.
name: Bao, Y. W.
name: Bi, X. J.
name: Chen, D.
name: Chen, T. L.
name: Chen, W. Y.
name: Chen, Xu
name: Chen, Y.
name: Cirennima
name: Cui, S. W.
name: Danzengluobu
name: Ding, L. K.
name: Fang, J. H.
name: Fang, K.
name: Feng, C. F.
name: Feng, Zhaoyang
name: Feng, Z. Y.
name: Gao, Qi
name: Gomi, A.
name: Gou, Q. B.
name: Guo, Y. Q.
name: Guo, Y. Y.
name: He, H. H.
name: He, Z. T.
name: Hibino, K.
name: Hotta, N.
name: Hu, Haibing
name: Hu, H. B.
name: Hu, K. Y.
name: Huang, J.
name: Jia, H. Y.
name: Jiang, L.
name: Jiang, P.
name: Jin, H. B.
name: Kasahara, K.
name: Katayose, Y.
name: Kato, C.
name: Kato, S.
name: Kawashima, T.
name: Kawata, K.
name: Kozai, M.
name: Kurashige, D.
name: Labaciren
name: Le, G. M.
name: Li, A. F.
name: Li, H. J.
name: Li, W. J.
name: Li, Y.
name: Lin, Y. H.
name: Liu, B.
name: Liu, C.
name: Liu, J. S.
name: Liu, L. Y.
name: Liu, M. Y.
name: Liu, W.
name: Liu, X. L.
name: Lou, Y. -Q.
name: Lu, H.
name: Meng, X. R.
name: Meng, Y.
name: Munakata, K.
name: Nagaya, K.
name: Nakamura, Y.
name: Nakazawa, Y.
name: Nanjo, H.
name: Ning, C. C.
name: Nishizawa, M.
name: Ohnishi, M.
name: Okukawa, S.
name: Ozawa, S.
name: Qian, L.
name: Qian, X.
name: Qian, X. L.
name: Qu, X. B.
name: Saito, T.
name: Sakakibara, Y.
name: Sakata, M.
name: Sako, T.
name: Sako, T. K.
name: Shao, J.
name: Shibata, M.
name: Shiomi, A.
name: Sugimoto, H.
name: Takano, W.
name: Takita, M.
name: Tan, Y. H.
name: Tateyama, N.
name: Torii, S.
name: Tsuchiya, H.
name: Udo, S.
name: Wang, H.
name: Wang, Y. P.
name: Wangdui
name: Wu, H. R.
name: Wu, Q.
name: Xu, J. L.
name: Xue, L.
name: Yang, Z.
name: Yao, Y. Q.
name: Yin, J.
name: Yokoe, Y.
name: Yu, N. P.
name: Yuan, A. F.
name: Zhai, L. M.
name: Zhang, C. P.
name: Zhang, H. M.
name: Zhang, J. L.
name: Zhang, X.
name: Zhang, X. Y.
name: Zhang, Y.
name: Zhang, Yi
name: Zhang, Ying
name: Zhao, S. P.
name: Zhaxisangzhu
name: Zhou, X. X.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $100\, {\rm TeV}$ 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 $0.34^{\circ} \pm 0.12^{\circ}$ is successfully detected above $25\, {\rm TeV}$ at $(α,\, δ) = (281.09^{\circ}\pm 0.10^{\circ},\, -3.76^{\circ}\pm 0.09^{\circ})$ 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 $25\, {\rm TeV} &lt; E &lt; 130\, {\rm TeV}$ is described with ${\rm d}N/{\rm d}E = (9.70\pm 1.89)\times 10^{-16} (E/40\, {\rm TeV})^{-3.26\pm 0.30}\, {\rm TeV}^{-1} {\rm cm}^{-2} {\rm s}^{-1}$, 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 $49.5\pm 9.0\, {\rm TeV}$. Associations of TASG J1844-038 with SNR G28.6$-$0.1 and PSR J1844-0346 are also discussed in detail for the first time.
description: 11 pages, 4 figures, 1 table