Observation of the γ-ray emission from W43 with LHAASO

/ Authors

Z. Cao, F. Aharonian, Axikegu, Y. Bai, Y. Bao, D. Bastieri, X. Bi, Y. Bi, W. Bian, A. V. Bukevich

and 288 more authors

Q. Cao, W. Cao, Z. Cao, J. Chang, J. Chang, A. M. Chen, E. Chen, H. Chen, Liang Chen, Lin Chen, Long Chen, M. Chen, M. Chen, Q. Chen, S. Chen, S. Chen, S. Chen, T. Chen, Y. Chen, N. Cheng, Y. D. Cheng, M. C. Chu, M. Cui, S. Cui, X. Cui, Y. Cui, B. Dai, H. Dai, Z. Dai, Danzengluobu, X. Dong, K. Duan, J. Fan, Y. Fan, J. Fang, J. Fang, K. Fang, C. Feng, H. Feng, L. Feng, S. Feng, X. Feng, Y. Feng, Y. Feng, S. Gabici, B. Gao, C. Gao, Q. Gao, W. Gao, W. Gao, M. Ge, T. Ge, L. Geng, G. Giacinti, G. Gong, Q. Gou, M. Gu, F. Guo, J. Guo, X. Guo, Y. Q. Guo, Y. Guo, Y. Han, O. Hannuksela, M. Hasan, H. He, H. He, J. He, Y. He, Y. Hor, B. Hou, C. Hou, X. Hou, H. Hu, Q. Hu, S. Hu, C. Huang, D. Huang, T. Huang, W. J. Huang, X. Huang, X. Y. Huang, Y. Huang, Y. Huang, X. Ji, H. Jia, K. Jia, H. Jiang, K. Jiang, X. Jiang, Z. Jiang, M. Jin, M. Kang, I. Karpikov, D. Khangulyan, D. Kuleshov, K. Kurinov, B. Li, C. Li, Cheng Li, Cong Li, D. Li, F. Li, H. Li, H. C. Li, Jian Li, Jie Li, K. Li, S. Li, W. Li, W. Li, X. Li, Xin Li, Y. Li, Zhe Li, Zhuo Li, E. Liang, Y. Liang, S. Lin, B. Liu, C. Liu, D. Liu, D. Liu, H. Liu, H. Liu, J. Liu, J. Liu, M. Liu, R. Liu, S. M. Liu, W. Liu, Y. Liu, Y. Liu, Q. Luo, Y. Luo, H. Lv, B. Ma, L. Ma, X. Ma, J. Mao, Z. Min, W. Mitthumsiri, H. Mu, Y. Nan, A. Neronov, K. Ng, L. Ou, P. Pattarakijwanich, Z. Pei, J. Qi, M. Qi, B. Qiao, J. Qin, A. Raza, D. Ruffolo, Alejandro Sáiz, M. Saeed, D. Semikoz, L. Shao, O. Shchegolev, X. Sheng, F. Shu, H. Song, Y. Stenkin, V. Stepanov, Y. Su, D. Sun, Q. N. Sun, X. Sun, Z. Sun, J. Takata, P. Tam, Q. Tang, R. Tang, Z. Tang, W. Tian, L. Wan, C. Wang, C. Wang, G. Wang, H. Wang, H. H. Wang, J. Wang, Kai Wang, Kai Wang, L. Wang, L. Y. Wang, P. Wang, R. Wang, W. Wang, X. Wang, X. Wang, Y. Wang, Y. Wang, Y. Wang, Z. H. Wang, Z. Wang, Zhen Wang, Zhenghan Wang, D. Wei, J. Wei, Y. Wei, T. Wen, C. Wu, H. Wu, Q. W. Wu, S. Wu, X. Wu, Y. Wu, S. Xi, J. Xia, G. Xiang, D. Xiao, G. Xiao, Y. Xin, Y. Xing, D. Xiong, Z. Xiong, D. Xu, R. Xu, R. Xu, W. Xu, L. Xue, D. Yan, J. Yan, T. Yan, C. Yang, C. Y. Yang, F. Yang, F. Yang, L. L. Yang, M. Yang, R. Yang, W. Yang, Y. Yao, Z. Yao, L. Yin, N. Yin, X. You, Z. You, Y. H. Yu, Q. Yuan, H. Yue, H. Zeng, T. Zeng, W. Zeng, M. Zha, B. Zhang, F. Zhang, H. Zhang, H. Zhang, H. Zhang, J. Zhang, Li Zhang, P. Zhang, P. P. Zhang, R. Zhang, S. B. Zhang, S. Zhang, S. Zhang, X. Zhang, X. Zhang, Y. Zhang, Yi Zhang, Yong Zhang, B. Zhao, J. Zhao, L. Zhao, L. Zhao, S. Zhao, X. H. Zhao, F. Zheng, W. Zhong, B. Zhou, H. Zhou, J. Zhou, M. Zhou, P. Zhou, R. Zhou, X. Zhou, X. Zhou, B. Zhu, C. Zhu, F. Zhu, H. Zhu, K. Zhu, Y. Zou, X. Zuo

/ Abstract

In this paper, we report the detection of the very-high-energy (VHE, 100 GeV < E < 100 TeV) and ultra-high-energy (UHE, E > 100 TeV) γ-ray emissions from the direction of the young star-forming region W43, observed by the Large High Altitude Air Shower Observation (LHAASO). The extended γ-ray source was detected with a significance of ∼ 16σ by KM2A and ∼ 17σ by WCDA, respectively. The angular extension of this γ-ray source is about 0.5 degrees, corresponding to a physical size of about 50 pc. We discuss the origin of the γ-ray emission and possible cosmic ray acceleration in the W43 region using multi-wavelength data. Our findings suggest that W43 is likely another young star cluster capable of accelerating cosmic rays (CRs) to at least several hundred TeV.

Journal: Science China Physics, Mechanics & Astronomy

DOI: 10.1007/s11433-024-2477-9