Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO

作者：Zhen Cao, F. Aharonian, Axikegu, Y. X. Bai, Y. W. Bao, D. Bastieri, Xiao-Jun Bi, Y. J. Bi, Weixin Bian, A.V Bukevich, Qing Cao, Weiwei Cao, Zhe Cao, Jiang Chang, J. F. Chang, A. M. Chen, E. S. Chen, H. X. Chen, Liang Chen, Lin Chen, Long Chen, M. J. Chen, M. L. Chen, Q. H. Chen, Shaomin Chen, S. H. Chen, S. Z. Chen, T. L. Chen, Y. Chen, Ningyan Cheng, Y. D. Cheng, Maxwell Cui, S. W. Cui, X. H. Cui, Y. D. Cui, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu Danzengluobu, X. Q. Dong, K. K. Duan, J. H. Fan, Y. Z. Fan, J. Fang, J. Fang, Kun Fang, Chunsheng Feng, Hansheng Feng, Lei Feng, S. H. Feng, X. T. Feng, Y. Feng, Y. L. Feng, S. Gabici, B. Gao, C. D. Gao, Qi Gao, W. Gao, W. K. Gao, M. M. Ge, Li‐Sheng Geng, Gwenael Giacinti, G. H. Gong, Q. B. Gou, M. H. Gu, Fulai Guo, Xiaoguang Guo, Yi-Qing Guo, Y. Y. Guo, Y. A. Han, M. Zahid Hasan, H. H. He, H. N. He, Jiawei He, Yan He, Y. K. Hor, Bowen Hou, C. Hou, Xin Hou, Haibing Hu, Q. Hu, S. C. Hu, Dezhi Huang, T. Q. Huang, W. J. Huang, X. T. Huang, X. Y. Huang, Yeyuan Huang, Xiangdong Ji, H. Y. Jia, Kun Jia, K. Jiang, X. W. Jiang, Z. J. Jiang, Ming Jin, M. M. Kang, I. Karpikov, D. Kuleshov, K. Kurinov, B. B. Li, C. M. Li, Cheng Li, Cong Li, Di Li, F. Li, H. B. Li, Cong Li, Jian Li, Jie Li, Ke Li, S. D. Li, W. L. Li, W. L. Li, X. R. Li, Xin Li, Yuze Li, Zhe Li, Z. Li, E. W. Liang, Liang Yu, Shangrong Lin, Bingyi Liu, Congzhan Liu, D. Liu, D. B. Liu, H. Liu, Haowen Liu, Jian Liu, Jianglai Liu, M. Y. Liu, R. Y. Liu, S. M. Liu, W. Liu, Yueqiang Liu, Yinong Liu, Q. Luo, Yangping Luo, H. K. Lv, B. Q., L. L., X. H., J. R. Mao, Z. Min, W. Mitthumsiri, H. J. Mu, Y. C. Nan, A. Neronov, Lijun Ou, P. Pattarakijwanich, Zhichao Pei, Jinfeng Qi, M. Y. Qi, B. Q. Qiao, J. J. Qin, Ali Raza, D. Ruffolo, A. Sáiz, M. A. Saeed, D. Semikoz, L. Shao, O. Shchegolev, X. D. Sheng, Fengchun Shu, H. C. Song, Yu. V. Stenkin, V. Stepanov, Youwu Su, Danfeng Sun, Q. N. Sun, X. N. Sun, Z. B. Sun, J. Takata, P. H. T. Tam, Qing-Wen Tang, Ruqi Tang, Z. B. Tang, Wenwu Tian, C. Wang, Chuxuan Wang, Guomin Wang, H. G. Wang, H. H. Wang, J. C. Wang, Kai Wang, Kai Wang, L. P. Wang, L. Y. Wang, Pei Wang, R. Wang, W. Wang, X. G. Wang, X. Wang, Yuwei Wang, Y. D. Wang, Y. J. Wang, Z. H. Wang, Z. X. Wang, Zhen Wang, Zheng Wang, Da-Ming Wei, Jun-Jie Wei, Yong Wei, Tao Wen, C. Y. Wu, H. R. Wu, Qinmu Wu, S. Wu, Xue-Feng Wu, Yi-Yen Wu, Shichuan Xi, Jun Xia, G. M. Xiang, D. X. Xiao, G. Xiao, Y. L. Xin, Yi Xing, Dingrong Xiong, Z. Xiong, D. L. Xu, R. F. Xu, Rong Xu, Weiyun Xu, W. Xu, D. H. Yan, Jun Yan, T. Yan, Chaoran Yang, Chuyuan Yang, Fengfan Yang, Fei Yang, Lili Yang, M. J. Yang, R. Z. Yang, W. X. Yang, Yuhua Yao, Z. G. Yao, L. Q. Yin, N. Yin, X. H. You, Z. Y. You, Yonglin Yu, Qiangqiang Yuan, H. Yue, Hui‐Yi Zeng, T. X. Zeng, Wen Zeng, M. Zha, B. B. Zhang, F. Zhang, H. Zhang, H. M. Zhang, H. Y. Zhang, J. L. Zhang, Li Zhang, P. F. Zhang, P. P. Zhang, R. Zhang, S. B. Zhang, Shun‐Rong Zhang, S. S. Zhang, X. Zhang, X. P. Zhang, Y. F. Zhang, Yi Zhang, Yong Zhang, Bing Zhao, J. Zhao, Lei Zhao, Lin Zhao, S. P. Zhao, Xiaohong Zhao, Feihu Zheng, W. J. Zhong, B. Zhou, H. Zhou, Jingzhi Zhou, M. Zhou, P. Zhou, Rong Zhou, Xuyang Zhou, Xuyang Zhou, Baohua Zhu, C. G. Zhu, F. R. Zhu, H. Zhu, Kai Zhu, Yuan-Chuan Zou, Xu Zuo · 发表于：The Astrophysical Journal Letters · 年份：2024 · DOI：10.3847/2041-8213/ad5e6d · 被引用次数：20 · 研究领域：Astrophysics and Cosmic Phenomena、Radio Astronomy Observations and Technology、Dark Matter and Cosmic Phenomena

Abstract The first source catalog of the Large High Altitude Air Shower Observatory (LHAASO) reported the detection of a very high energy gamma-ray source, 1LHAASO J1219+2915. This Letter presents a further detailed study of the spectral and temporal behavior of this pointlike source. The best-fit position of the TeV source (R.A. = 185.°05 ± 0.°04, decl. = 29.°25 ± 0.°03) is compatible with NGC 4278 within ∼0.°03. Variation analysis shows an indication of variability on a timescale of a few months in the TeV band, which is consistent with low-frequency observations. Based on these observations, we report the detection of TeV γ -ray emissions from this low-luminosity active galactic nucleus. The observation by LHAASO's Water Cherenkov Detector Array during the active period has a significance level of 8.8 σ with a best-fit photon spectral index Γ = 2.56 ± 0.14 and a flux f 1–10 TeV = (7.0 ± 1.1 sta ± 0.35 syst ) × 10 −13 photons cm −2 s −1 , or approximately 5% of the Crab Nebula. The discovery of VHE gamma-ray emission from NGC 4278 indicates that compact, weak radio jets can efficiently accelerate particles and emit TeV photons.