Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV

Zhen Cao; F. Aharonian; Q. An; Axikegu; L. X. Bai; Y. X. Bai; Y. W. Bao; D. Bastieri; X. J. Bi; Y. J. Bi; H. Cai; J. T. Cai; Zhe Cao; J. Chang; J. F. Chang; B. M. Chen; E. S. Chen; J. Chen; Liang Chen; Liang Chen; Long Chen; M. J. Chen; M. L. Chen; Q. H. Chen; S. H. Chen; S. Z. Chen; T. L. Chen; X. L. Chen; Y. Chen; N. Cheng; Y. D. Cheng; S. W. Cui; X. H. Cui; Y. D. Cui; B. D'Ettorre Piazzoli; B. Z. Dai; H. L. Dai; Z. G. Dai; Danzengluobu; D. Della Volpe; X. J. Dong; K. K. Duan; J. H. Fan; Y. Z. Fan; Z. X. Fan; J. Fang; K. Fang; C. F. Feng; L. Feng; S. H. Feng; Y. L. Feng; B. Gao; C. D. Gao; L. Q. Gao; Q. Gao; W. Gao; M. M. Ge; L. S. Geng; G. H. Gong; Q. B. Gou; M. H. Gu; F. L. Guo; J. G. Guo; X. L. Guo; Y. Q. Guo; Y. Y. Guo; Y. A. Han; H. H. He; H. N. He; J. C. He; S. L. He; X. B. He; Y. He; M. Heller; Y. K. Hor; C. Hou; H. B. Hu; S. Hu; S. C. Hu; X. J. Hu; D. H. Huang; Q. L. Huang; W. H. Huang; X. T. Huang; X. Y. Huang; Z. C. Huang; F. Ji; X. L. Ji; H. Y. Jia; K. Jiang; Z. J. Jiang; C. Jin; T. Ke; D. Kuleshov; K. Levochkin; B. B. Li; Cheng Li; Cong Li; F. Li; H. B. Li; H. C. Li; H. Y. Li; J. Li; K. Li; W. L. Li; X. R. Li; Xin Li; Xin Li; Y. Li; Y. Z. Li; Zhe Li; Zhuo Li; E. W. Liang; Y. F. Liang; S. J. Lin; B. Liu; C. Liu; D. Liu; H. Liu; H. D. Liu; J. Liu; J. L. Liu; J. S. Liu; J. Y. Liu; M. Y. Liu; R. Y. Liu; S. M. Liu; W. Liu; Y. Liu; Y. N. Liu; Z. X. Liu; W. J. Long; R. Lu; H. K. Lv; B. Q. Ma; L. L. Ma; X. H. Ma; J. R. Mao; A. Masood; Z. Min; W. Mitthumsiri; T. Montaruli; Y. C. Nan; B. Y. Pang; P. Pattarakijwanich; Z. Y. Pei; M. Y. Qi; Y. Q. Qi; B. Q. Qiao; J. J. Qin; D. Ruffolo; V. Rulev; A. Sáiz; L. Shao; O. Shchegolev; X. D. Sheng; J. Y. Shi; H. C. Song; Yu V. Stenkin; V. Stepanov; Y. Su; Q. N. Sun; X. N. Sun; Z. B. Sun; P. H.T. Tam; Z. B. Tang; W. W. Tian; B. D. Wang; C. Wang; H. Wang; H. G. Wang; J. C. Wang; J. S. Wang; L. P. Wang; L. Y. Wang; R. N. Wang; W. Wang; W. Wang; X. G. Wang; X. J. Wang; X. Y. Wang; Y. Wang; Y. D. Wang; Y. J. Wang; Y. P. Wang; Z. H. Wang; Z. X. Wang; Zhen Wang; Zheng Wang; D. M. Wei; J. J. Wei; Y. J. Wei; T. Wen; C. Y. Wu; H. R. Wu; S. Wu; W. X. Wu; X. F. Wu; S. Q. Xi; J. Xia; J. J. Xia; G. M. Xiang; D. X. Xiao; G. Xiao; H. B. Xiao; G. G. Xin; Y. L. Xin; Y. Xing; D. L. Xu; R. X. Xu; L. Xue; D. H. Yan; J. Z. Yan; C. W. Yang; F. F. Yang; J. Y. Yang; L. L. Yang; M. J. Yang; R. Z. Yang; S. B. Yang; Y. H. Yao; Z. G. Yao; Y. M. Ye; L. Q. Yin; N. Yin; X. H. You; Z. Y. You; Y. H. Yu; Q. Yuan; H. D. Zeng; T. X. Zeng; W. Zeng; Z. K. Zeng; M. Zha; X. X. Zhai; B. B. Zhang; H. M. Zhang; H. Y. Zhang; J. L. Zhang; J. W. Zhang; L. X. Zhang; Li Zhang; Lu Zhang; P. F. Zhang; P. P. Zhang; R. Zhang; S. R. Zhang; S. S. Zhang; X. Zhang; X. P. Zhang; Y. F. Zhang; Y. L. Zhang; Yi Zhang; Yong Zhang; B. Zhao; J. Zhao; L. Zhao; L. Z. Zhao; S. P. Zhao; F. Zheng; Y. Zheng; B. Zhou; H. Zhou; J. N. Zhou; P. Zhou; R. Zhou; X. X. Zhou; C. G. Zhu; F. R. Zhu; H. Zhu; K. J. Zhu; X. Zuo

doi:10.3847/2041-8213/ac0fd5

Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV

Zhen Cao
, F. Aharonian
, Q. An
, Axikegu
, L. X. Bai
, Y. X. Bai
, Y. W. Bao
, D. Bastieri
, X. J. Bi
, Y. J. Bi
, H. Cai
, J. T. Cai
, Zhe Cao
, J. Chang
, J. F. Chang
, B. M. Chen
, E. S. Chen
, J. Chen
, Liang Chen
, Liang Chen

Long Chen, M. J. Chen, M. L. Chen, Q. H. Chen, S. H. Chen, S. Z. Chen, T. L. Chen, X. L. Chen, Y. Chen, N. Cheng, Y. D. Cheng, S. W. Cui, X. H. Cui, Y. D. Cui, B. D'Ettorre Piazzoli, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu, D. Della Volpe, X. J. Dong, K. K. Duan, J. H. Fan, Y. Z. Fan, Z. X. Fan, J. Fang, K. Fang, C. F. Feng, L. Feng, S. H. Feng, Y. L. Feng, B. Gao, C. D. Gao, L. Q. Gao, Q. Gao, W. Gao, M. M. Ge, L. S. Geng, G. H. Gong, Q. B. Gou, M. H. Gu, F. L. Guo, J. G. Guo, X. L. Guo, Y. Q. Guo, Y. Y. Guo, Y. A. Han, H. H. He, H. N. He, J. C. He, S. L. He, X. B. He, Y. He, M. Heller, Y. K. Hor, C. Hou, H. B. Hu, S. Hu, S. C. Hu, X. J. Hu, D. H. Huang, Q. L. Huang, W. H. Huang, X. T. Huang, X. Y. Huang, Z. C. Huang, F. Ji, X. L. Ji, H. Y. Jia, K. Jiang, Z. J. Jiang, C. Jin, T. Ke, D. Kuleshov, K. Levochkin, B. B. Li, Cheng Li, Cong Li, F. Li, H. B. Li, H. C. Li, H. Y. Li, J. Li, K. Li, W. L. Li, X. R. Li, Xin Li, Xin Li, Y. Li, Y. Z. Li, Zhe Li, Zhuo Li, E. W. Liang, Y. F. Liang, S. J. Lin, B. Liu, C. Liu, D. Liu, H. Liu, H. D. Liu, J. Liu, J. L. Liu, J. S. Liu, J. Y. Liu, M. Y. Liu, R. Y. Liu, S. M. Liu, W. Liu, Y. Liu, Y. N. Liu, Z. X. Liu, W. J. Long, R. Lu, H. K. Lv, B. Q. Ma, L. L. Ma, X. H. Ma, J. R. Mao, A. Masood, Z. Min, W. Mitthumsiri, T. Montaruli, Y. C. Nan, B. Y. Pang, P. Pattarakijwanich, Z. Y. Pei, M. Y. Qi, Y. Q. Qi, B. Q. Qiao, J. J. Qin, D. Ruffolo, V. Rulev, A. Sáiz, L. Shao, O. Shchegolev, X. D. Sheng, J. Y. Shi, H. C. Song, Yu V. Stenkin, V. Stepanov, Y. Su, Q. N. Sun, X. N. Sun, Z. B. Sun, P. H.T. Tam, Z. B. Tang, W. W. Tian, B. D. Wang, C. Wang, H. Wang, H. G. Wang, J. C. Wang, J. S. Wang, L. P. Wang, L. Y. Wang, R. N. Wang, W. Wang, W. Wang, X. G. Wang, X. J. Wang, X. Y. Wang, Y. Wang, Y. D. Wang, Y. J. Wang, Y. P. Wang, Z. H. Wang, Z. X. Wang, Zhen Wang, Zheng Wang, D. M. Wei, J. J. Wei, Y. J. Wei, T. Wen, C. Y. Wu, H. R. Wu, S. Wu, W. X. Wu, X. F. Wu, S. Q. Xi, J. Xia, J. J. Xia, G. M. Xiang, D. X. Xiao, G. Xiao, H. B. Xiao, G. G. Xin, Y. L. Xin, Y. Xing, D. L. Xu, R. X. Xu, L. Xue, D. H. Yan, J. Z. Yan, C. W. Yang, F. F. Yang, J. Y. Yang, L. L. Yang, M. J. Yang, R. Z. Yang, S. B. Yang, Y. H. Yao, Z. G. Yao, Y. M. Ye, L. Q. Yin, N. Yin, X. H. You, Z. Y. You, Y. H. Yu, Q. Yuan, H. D. Zeng, T. X. Zeng, W. Zeng, Z. K. Zeng, M. Zha, X. X. Zhai, B. B. Zhang, H. M. Zhang, H. Y. Zhang, J. L. Zhang, J. W. Zhang, L. X. Zhang, Li Zhang, Lu Zhang, P. F. Zhang, P. P. Zhang, R. Zhang, S. R. Zhang, S. S. Zhang, X. Zhang, X. P. Zhang, Y. F. Zhang, Y. L. Zhang, Yi Zhang, Yong Zhang, B. Zhao, J. Zhao, L. Zhao, L. Z. Zhao, S. P. Zhao, F. Zheng, Y. Zheng, B. Zhou, H. Zhou, J. N. Zhou, P. Zhou, R. Zhou, X. X. Zhou, C. G. Zhu, F. R. Zhu, H. Zhu, K. J. Zhu, X. Zuo

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

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. 06stat 0. 02sys. 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 0.19stat 0.02sys 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.

Original language	English
Article number	L4
Journal	Astrophysical Journal Letters
Volume	917
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/ac0fd5
State	Published - 10 Aug 2021
Externally published	Yes

Access to Document

10.3847/2041-8213/ac0fd5

Cite this

Cao, Z., Aharonian, F., An, Q., Axikegu, Bai, L. X., Bai, Y. X., Bao, Y. W., Bastieri, D., Bi, X. J., Bi, Y. J., Cai, H., Cai, J. T., Cao, Z., Chang, J., Chang, J. F., Chen, B. M., Chen, E. S., Chen, J., Chen, L., ... Zuo, X. (2021). Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV. Astrophysical Journal Letters, 917(1), Article L4. https://doi.org/10.3847/2041-8213/ac0fd5

@article{bbe378b2fe224eb7a575247468271635,

title = "Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV",

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. 06stat 0. 02sys. 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 0.19stat 0.02sys 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.",

author = "Zhen Cao and F. Aharonian and Q. An and Axikegu and Bai, \{L. X.\} and Bai, \{Y. X.\} and Bao, \{Y. W.\} and D. Bastieri and Bi, \{X. J.\} and Bi, \{Y. J.\} and H. Cai and Cai, \{J. T.\} and Zhe Cao and J. Chang and Chang, \{J. F.\} and Chen, \{B. M.\} and Chen, \{E. S.\} and J. Chen and Liang Chen and Liang Chen and Long Chen and Chen, \{M. J.\} and Chen, \{M. L.\} and Chen, \{Q. H.\} and Chen, \{S. H.\} and Chen, \{S. Z.\} and Chen, \{T. L.\} and Chen, \{X. L.\} and Y. Chen and N. Cheng and Cheng, \{Y. D.\} and Cui, \{S. W.\} and Cui, \{X. H.\} and Cui, \{Y. D.\} and \{D'Ettorre Piazzoli\}, B. and Dai, \{B. Z.\} and Dai, \{H. L.\} and Dai, \{Z. G.\} and Danzengluobu and Volpe, \{D. Della\} and Dong, \{X. J.\} and Duan, \{K. K.\} and Fan, \{J. H.\} and Fan, \{Y. Z.\} and Fan, \{Z. X.\} and J. Fang and K. Fang and Feng, \{C. F.\} and L. Feng and Feng, \{S. H.\} and Feng, \{Y. L.\} and B. Gao and Gao, \{C. D.\} and Gao, \{L. Q.\} and Q. Gao and W. Gao and Ge, \{M. M.\} and Geng, \{L. S.\} and Gong, \{G. H.\} and Gou, \{Q. B.\} and Gu, \{M. H.\} and Guo, \{F. L.\} and Guo, \{J. G.\} and Guo, \{X. L.\} and Guo, \{Y. Q.\} and Guo, \{Y. Y.\} and Han, \{Y. A.\} and He, \{H. H.\} and He, \{H. N.\} and He, \{J. C.\} and He, \{S. L.\} and He, \{X. B.\} and Y. He and M. Heller and Hor, \{Y. K.\} and C. Hou and Hu, \{H. B.\} and S. Hu and Hu, \{S. C.\} and Hu, \{X. J.\} and Huang, \{D. H.\} and Huang, \{Q. L.\} and Huang, \{W. H.\} and Huang, \{X. T.\} and Huang, \{X. Y.\} and Huang, \{Z. C.\} and F. Ji and Ji, \{X. L.\} and Jia, \{H. Y.\} and K. Jiang and Jiang, \{Z. J.\} and C. Jin and T. Ke and D. Kuleshov and K. Levochkin and Li, \{B. B.\} and Cheng Li and Cong Li and F. Li and Li, \{H. B.\} and Li, \{H. C.\} and Li, \{H. Y.\} and J. Li and K. Li and Li, \{W. L.\} and Li, \{X. R.\} and Xin Li and Xin Li and Y. Li and Li, \{Y. Z.\} and Zhe Li and Zhuo Li and Liang, \{E. W.\} and Liang, \{Y. F.\} and Lin, \{S. J.\} and B. Liu and C. Liu and D. Liu and H. Liu and Liu, \{H. D.\} and J. Liu and Liu, \{J. L.\} and Liu, \{J. S.\} and Liu, \{J. Y.\} and Liu, \{M. Y.\} and Liu, \{R. Y.\} and Liu, \{S. M.\} and W. Liu and Y. Liu and Liu, \{Y. N.\} and Liu, \{Z. X.\} and Long, \{W. J.\} and R. Lu and Lv, \{H. K.\} and Ma, \{B. Q.\} and Ma, \{L. L.\} and Ma, \{X. H.\} and Mao, \{J. R.\} and A. Masood and Z. Min and W. Mitthumsiri and T. Montaruli and Nan, \{Y. C.\} and Pang, \{B. Y.\} and P. Pattarakijwanich and Pei, \{Z. Y.\} and Qi, \{M. Y.\} and Qi, \{Y. Q.\} and Qiao, \{B. Q.\} and Qin, \{J. J.\} and D. Ruffolo and V. Rulev and A. S{\'a}iz and L. Shao and O. Shchegolev and Sheng, \{X. D.\} and Shi, \{J. Y.\} and Song, \{H. C.\} and Stenkin, \{Yu V.\} and V. Stepanov and Y. Su and Sun, \{Q. N.\} and Sun, \{X. N.\} and Sun, \{Z. B.\} and Tam, \{P. H.T.\} and Tang, \{Z. B.\} and Tian, \{W. W.\} and Wang, \{B. D.\} and C. Wang and H. Wang and Wang, \{H. G.\} and Wang, \{J. C.\} and Wang, \{J. S.\} and Wang, \{L. P.\} and Wang, \{L. Y.\} and Wang, \{R. N.\} and W. Wang and W. Wang and Wang, \{X. G.\} and Wang, \{X. J.\} and Wang, \{X. Y.\} and Y. Wang and Wang, \{Y. D.\} and Wang, \{Y. J.\} and Wang, \{Y. P.\} and Wang, \{Z. H.\} and Wang, \{Z. X.\} and Zhen Wang and Zheng Wang and Wei, \{D. M.\} and Wei, \{J. J.\} and Wei, \{Y. J.\} and T. Wen and Wu, \{C. Y.\} and Wu, \{H. R.\} and S. Wu and Wu, \{W. X.\} and Wu, \{X. F.\} and Xi, \{S. Q.\} and J. Xia and Xia, \{J. J.\} and Xiang, \{G. M.\} and Xiao, \{D. X.\} and G. Xiao and Xiao, \{H. B.\} and Xin, \{G. G.\} and Xin, \{Y. L.\} and Y. Xing and Xu, \{D. L.\} and Xu, \{R. X.\} and L. Xue and Yan, \{D. H.\} and Yan, \{J. Z.\} and Yang, \{C. W.\} and Yang, \{F. F.\} and Yang, \{J. Y.\} and Yang, \{L. L.\} and Yang, \{M. J.\} and Yang, \{R. Z.\} and Yang, \{S. B.\} and Yao, \{Y. H.\} and Yao, \{Z. G.\} and Ye, \{Y. M.\} and Yin, \{L. Q.\} and N. Yin and You, \{X. H.\} and You, \{Z. Y.\} and Yu, \{Y. H.\} and Q. Yuan and Zeng, \{H. D.\} and Zeng, \{T. X.\} and W. Zeng and Zeng, \{Z. K.\} and M. Zha and Zhai, \{X. X.\} and Zhang, \{B. B.\} and Zhang, \{H. M.\} and Zhang, \{H. Y.\} and Zhang, \{J. L.\} and Zhang, \{J. W.\} and Zhang, \{L. X.\} and Li Zhang and Lu Zhang and Zhang, \{P. F.\} and Zhang, \{P. P.\} and R. Zhang and Zhang, \{S. R.\} and Zhang, \{S. S.\} and X. Zhang and Zhang, \{X. P.\} and Zhang, \{Y. F.\} and Zhang, \{Y. L.\} and Yi Zhang and Yong Zhang and B. Zhao and J. Zhao and L. Zhao and Zhao, \{L. Z.\} and Zhao, \{S. P.\} and F. Zheng and Y. Zheng and B. Zhou and H. Zhou and Zhou, \{J. N.\} and P. Zhou and R. Zhou and Zhou, \{X. X.\} and Zhu, \{C. G.\} and Zhu, \{F. R.\} and H. Zhu and Zhu, \{K. J.\} and X. Zuo",

year = "2021",

month = aug,

day = "10",

doi = "10.3847/2041-8213/ac0fd5",

language = "英语",

volume = "917",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

Cao, Z, Aharonian, F, An, Q, Axikegu, Bai, LX, Bai, YX, Bao, YW, Bastieri, D, Bi, XJ, Bi, YJ, Cai, H, Cai, JT, Cao, Z, Chang, J, Chang, JF, Chen, BM, Chen, ES, Chen, J, Chen, L, Chen, L, Chen, L, Chen, MJ, Chen, ML, Chen, QH, Chen, SH, Chen, SZ, Chen, TL, Chen, XL, Chen, Y, Cheng, N, Cheng, YD, Cui, SW, Cui, XH, Cui, YD, D'Ettorre Piazzoli, B, Dai, BZ, Dai, HL, Dai, ZG, Danzengluobu, Volpe, DD, Dong, XJ, Duan, KK, Fan, JH, Fan, YZ, Fan, ZX, Fang, J, Fang, K, Feng, CF, Feng, L, Feng, SH, Feng, YL, Gao, B, Gao, CD, Gao, LQ, Gao, Q, Gao, W, Ge, MM, Geng, LS, Gong, GH, Gou, QB, Gu, MH, Guo, FL, Guo, JG, Guo, XL, Guo, YQ, Guo, YY, Han, YA, He, HH, He, HN, He, JC, He, SL, He, XB, He, Y, Heller, M, Hor, YK, Hou, C, Hu, HB, Hu, S, Hu, SC, Hu, XJ, Huang, DH, Huang, QL, Huang, WH, Huang, XT, Huang, XY, Huang, ZC, Ji, F, Ji, XL, Jia, HY, Jiang, K, Jiang, ZJ, Jin, C, Ke, T, Kuleshov, D, Levochkin, K, Li, BB, Li, C, Li, C, Li, F, Li, HB, Li, HC, Li, HY, Li, J, Li, K, Li, WL, Li, XR, Li, X, Li, X, Li, Y, Li, YZ, Li, Z, Li, Z, Liang, EW, Liang, YF, Lin, SJ, Liu, B, Liu, C, Liu, D, Liu, H, Liu, HD, Liu, J, Liu, JL, Liu, JS, Liu, JY, Liu, MY, Liu, RY, Liu, SM, Liu, W, Liu, Y, Liu, YN, Liu, ZX, Long, WJ, Lu, R, Lv, HK, Ma, BQ, Ma, LL, Ma, XH, Mao, JR, Masood, A, Min, Z, Mitthumsiri, W, Montaruli, T, Nan, YC, Pang, BY, Pattarakijwanich, P, Pei, ZY, Qi, MY, Qi, YQ, Qiao, BQ, Qin, JJ, Ruffolo, D, Rulev, V, Sáiz, A, Shao, L, Shchegolev, O, Sheng, XD, Shi, JY, Song, HC, Stenkin, YV, Stepanov, V, Su, Y, Sun, QN, Sun, XN, Sun, ZB, Tam, PHT, Tang, ZB, Tian, WW, Wang, BD, Wang, C, Wang, H, Wang, HG, Wang, JC, Wang, JS, Wang, LP, Wang, LY, Wang, RN, Wang, W, Wang, W, Wang, XG, Wang, XJ, Wang, XY, Wang, Y, Wang, YD, Wang, YJ, Wang, YP, Wang, ZH, Wang, ZX, Wang, Z, Wang, Z, Wei, DM, Wei, JJ, Wei, YJ, Wen, T, Wu, CY, Wu, HR, Wu, S, Wu, WX, Wu, XF, Xi, SQ, Xia, J, Xia, JJ, Xiang, GM, Xiao, DX, Xiao, G, Xiao, HB, Xin, GG, Xin, YL, Xing, Y, Xu, DL, Xu, RX, Xue, L, Yan, DH, Yan, JZ, Yang, CW, Yang, FF, Yang, JY, Yang, LL, Yang, MJ, Yang, RZ, Yang, SB, Yao, YH, Yao, ZG, Ye, YM, Yin, LQ, Yin, N, You, XH, You, ZY, Yu, YH, Yuan, Q, Zeng, HD, Zeng, TX, Zeng, W, Zeng, ZK, Zha, M, Zhai, XX, Zhang, BB, Zhang, HM, Zhang, HY, Zhang, JL, Zhang, JW, Zhang, LX, Zhang, L, Zhang, L, Zhang, PF, Zhang, PP, Zhang, R, Zhang, SR, Zhang, SS, Zhang, X, Zhang, XP, Zhang, YF, Zhang, YL, Zhang, Y, Zhang, Y, Zhao, B, Zhao, J, Zhao, L, Zhao, LZ, Zhao, SP, Zheng, F, Zheng, Y, Zhou, B, Zhou, H, Zhou, JN, Zhou, P, Zhou, R, Zhou, XX, Zhu, CG, Zhu, FR, Zhu, H, Zhu, KJ & Zuo, X 2021, 'Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV', Astrophysical Journal Letters, vol. 917, no. 1, L4. https://doi.org/10.3847/2041-8213/ac0fd5

TY - JOUR

T1 - Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV

AU - Cao, Zhen

AU - Aharonian, F.

AU - An, Q.

AU - Axikegu,

AU - Bai, L. X.

AU - Bai, Y. X.

AU - Bao, Y. W.

AU - Bastieri, D.

AU - Bi, X. J.

AU - Bi, Y. J.

AU - Cai, H.

AU - Cai, J. T.

AU - Cao, Zhe

AU - Chang, J.

AU - Chang, J. F.

AU - Chen, B. M.

AU - Chen, E. S.

AU - Chen, J.

AU - Chen, Liang

AU - Chen, Long

AU - Chen, M. J.

AU - Chen, M. L.

AU - Chen, Q. H.

AU - Chen, S. H.

AU - Chen, S. Z.

AU - Chen, T. L.

AU - Chen, X. L.

AU - Chen, Y.

AU - Cheng, N.

AU - Cheng, Y. D.

AU - Cui, S. W.

AU - Cui, X. H.

AU - Cui, Y. D.

AU - D'Ettorre Piazzoli, B.

AU - Dai, B. Z.

AU - Dai, H. L.

AU - Dai, Z. G.

AU - Danzengluobu,

AU - Volpe, D. Della

AU - Dong, X. J.

AU - Duan, K. K.

AU - Fan, J. H.

AU - Fan, Y. Z.

AU - Fan, Z. X.

AU - Fang, J.

AU - Fang, K.

AU - Feng, C. F.

AU - Feng, L.

AU - Feng, S. H.

AU - Feng, Y. L.

AU - Gao, B.

AU - Gao, C. D.

AU - Gao, L. Q.

AU - Gao, Q.

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PY - 2021/8/10

Y1 - 2021/8/10

N2 - 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. 06stat 0. 02sys. 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 0.19stat 0.02sys 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.

AB - 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. 06stat 0. 02sys. 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 0.19stat 0.02sys 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.

UR - https://www.scopus.com/pages/publications/85113363927

U2 - 10.3847/2041-8213/ac0fd5

DO - 10.3847/2041-8213/ac0fd5

M3 - 文章

AN - SCOPUS:85113363927

SN - 2041-8205

VL - 917

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L4

ER -

Discovery of a New Gamma-Ray Source, LHAASO J0341+5258, with Emission up to 200 TeV

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