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Get Free AccessAbstract The Water Cherenkov Detector Array (WCDA) is one of the components of Large High Altitude Air Shower Observatory (LHAASO) and can monitor any sources over two-thirds of the sky for up to 7 hours per day with >98% duty cycle. In this work, we report the detection of two outbursts of the Fanaroff-Riley I radio galaxy NGC 1275 that were detected by LHAASO-WCDA between November 2022 and January 2023 with statistical significance of 5.2 σ and 8.3 σ. The observed spectral energy distribution in the range from 500 GeV to 3 TeV is fitted by a power-law with a best-fit spectral index of α = −3.37 ± 0.52 and −3.35 ± 0.29, respectively. The outburst flux above 0.5 TeV was ($4.55\pm 4.21)\times ~10^{-11}~\rm cm^{-2}~s^{-1}$ and ($3.45\pm 1.78)\times ~10^{-11}~\rm cm^{-2}~s^{-1}$, corresponding to 60%, 45% of Crab Nebula flux. Variation analysis reveals the variability time-scale of days at the TeV energy band. A simple test by one-zone synchrotron self-Compton model reproduces the data in the gamma-ray band well.
Z. Cao, F Aharonian, Axikegu , Yucen Bai, Y. W. Bao, D. Bastieri, Xiao-Jun Bi, Yujiang Bi, Wen‐Jie Bian, A. V. Bukevich, Q Cao, Weiwei Cao, Zhe Cao, J. F. Chang, J.F. Chang, Allen M. Chen, Elizabeth Chen, H X Chen, Liang Chen, Lin Chen, Long Chen, Michael Chen, M L Chen, Q H Chen, Shengyong Chen, S. H. Chen, S Z Chen, T. L. Chen, Yang Chen, Na Cheng, Yaodong Cheng, M. C. Chu, Mingyue Cui, S. W. Cui, Xiaohong Cui, Yudong Cui, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu Danzengluobu, X.Q Dong, Kai-Kai Duan, J. H. Fan, Fan Yang, Jingzhong Fang, J. Fang, Kun Fang, C. F. Feng, H Feng, L. Feng, Shuai Feng, Xia‐Ting Feng, Yi Feng, Yuzhen Feng, S. Gabici, Bo Gao, Chuyue Gao, Qi Gao, Wei Gao, Wenlong Gao, M. M. Ge, Tianyu Ge, Li-Sheng Geng, Gwenael Giacinti, G. Gong, Q. B. Gou, M. H. Gu, Feng Guo, J. Guo, Xueling Guo, Yanjun Guo, Yong Guo, Y. A. Han, O. A. Hannuksela, M Hasan, H. H. He, Haoning He, Jianying He, Yu He, Y. K. Hor, B. W. Hou, Changbo Hou, H. B. Hu, Qi Hu, Sheng Hu, Chen Huang, D. Huang, Teng Huang, W. J. Huang, X. T. Huang, Xiaoyuan Huang, Yiming Huang, Yao Huang, X. L. Ji, H. Y. Jia, Ke Jia, Haixia Jiang, K. Jiang, Xuefeng Jiang, Z. J. Jiang (2024). Detection of two TeV gamma-ray outbursts from NGC 1275 by LHAASO. , DOI: https://doi.org/10.1093/mnras/stae2512.
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Type
Article
Year
2024
Authors
100
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1093/mnras/stae2512
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