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Axikegu; Bai, L. X.; Bi, Y. J.; Cai, H.; Cai, J. T.; Chang, J.; Chen, J.; Chen, Liang; Cheng, N.; Cui, Y. D.; Danzengluobu; Dong, X. J.; Fan, J. H.; Fan, Y. Z.; Fang, J.; Feng, L.; Feng, S. H.; Feng, Y. L.; Gao, L. Q.; Geng, L. S.; Gou, Q. B.; Gu, M. H.; Guo, J. G.; Guo, Y. Y.; Han, Y. A.; He, H. H.; He, H. N.; He, S. L.; He, X. B.; He, Y.; Hu, S.; Hu, S. C.; Huang, D. H.; Huang, X. Y.; Huang, Z. C.; Jiang, K.; Jiang, Z. J.; Kuleshov, D.; Li, Cheng; Li, Cong; Li, F.; Li, H. C.; Li, H. Y.; Li, W. L.; Li, Zhuo; Liang, E. W.; Lin, S. J.; Liu, H.; Liu, R. Y.; Liu, S. M.; Liu, W.; Long, W. J.; Ma, L. L.; Masood, A.; Min, Z.; Mitthumsiri, W.; Montaruli, T.; Nan, Y. C.; Pei, Z. Y.; Qi, M. Y.; Ruffolo, D.; Shao, L.; Sheng, X. D.; Song, H. C.; Stenkin, Yu. V.; Sun, Z. B.; Tang, Z. B.; Wang, J. S.; Wang, W.; Wang, X. J.; Wang, Z. H.; Wang, Z. X.; Wang, Zheng; Wei, D. M.; Wei, Y. J.; Wu, H. R.; Wu, W. X.; Wu, X. F.; Xia, J. J.; Xu, D. L.; Yang, C. W.; Yao, Y. H.; Yuan, Q.; Zeng, H. D.; Zeng, T. X.; Zeng, Z. K.; Zhai, X. X.; Zhang, H. M.; Zhang, J. L.; Zhang, Lu; Zhang, S. R.; Zhang, Y. F.; Zhang, Y. L.; Zhang, Yi; Zhao, J.; Zhao, L. Z.; Zhou, J. N.; Zhou, R.; Zhu, H.; Zhu, K. J.
Astrophysical journal. Letters, 08/2021, Letnik: 917, Številka: 1Journal Article
Abstract We report the discovery of a new unidentified extended γ -ray source in the Galactic plane named LHAASO J0341+5258 with a pretrial significance of 8.2 standard deviations above 25 TeV. The best-fit position is R.A. = 55.°34 ± 0.°11 and decl. = 52.°97 ± 0.°07. The angular size of LHAASO J0341+5258 is 0.°29 ± 0.°06 stat ± 0.°02 sys . The flux above 25 TeV is about 20% of the flux of the Crab Nebula. Although a power-law fit of the spectrum from 10 to 200 TeV with the photon index α = 2.98 ± 0.19 stat ± 0.02 sys is not excluded, the LHAASO data together with the flux upper limit at 10 GeV set by the Fermi-LAT observation, indicate a noticeable steepening of an initially hard power-law spectrum with a cutoff at ≈50 TeV. We briefly discuss the origin of ultra-high-energy gamma rays. The lack of an energetic pulsar and a young supernova remnant inside or in the vicinity of LHAASO J0341+5258 challenge, but do not exclude, both the leptonic and hadronic scenarios of gamma-ray production.
