arXiv · 2410.08988
Ultrahigh-Energy Gamma-ray Emission Associated with Black Hole-Jet Systems
Abstract
Black holes (BH), one of the most intriguing objects in the universe, can manifest themselves through electromagnetic radiation initiated by the accretion flow. Some stellar-mass BHs drive relativistic jets when accreting matter from their companion stars, forming microquasars. Non-thermal emission from the radio to tera-electronvolt (TeV) gamma-ray band has been observed from microquasars, indicating the acceleration of relativistic particles. Here we report detection of four microquasars (SS 433, V4641 Sgr, GRS 1915+105, MAXI J1820+070) of spectrum extending to the ultrahigh-energy (UHE; photon energy $E>100$ TeV) band and one microquasar (Cygnus X-1) of spectrum approaching 100 TeV, using the Large High Altitude Air Shower Observatory (LHAASO). Notably, the total emission associated with SS 433 cannot be interpreted with a single leptonic component. In the UHE band, its emission is in spatial coincidence with a giant atomic cloud, which is consistent with a hadronic origin. An elongated source is discovered from V4641 Sgr with the spectrum continuing up to 800 TeV. The detection of UHE gamma rays demonstrates that accreting BHs and their environments can operate as extremely efficient accelerators of particles out of 1 peta-electronvolt (PeV), suggesting microquasars to be important contributors to Galactic cosmic rays especially around the `knee' region.
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The LHAASO Collaboration, Zhen Cao, Felix Aharonian, Yun-Xiang Bai, Yi-Wei Bao, Denis Bastieri, Xiao-Jun Bi, Yu-Jiang Bi, Wen-Yi Bian, Anatoly V Bukevich, Chengmiao Cai, Wen-Yu Cao, Zhe Cao, Jin Chang, Jin-Fan Chang, Aming Chen, En-Sheng Chen, Guohai Chen, Hua-Xi Chen, Liang Chen, Long Chen, Ming-Jun Chen, Ma-Li Chen, Qi-Hui Chen, Shi Chen, Su-Hong Chen, Song-Zhan Chen, Tian-Lu Chen, Xiao-Bin Chen, Xuejian Chen, Yang Chen, Ning Cheng, Yao-Dong Cheng, Ming Chung Chu, Ming-Yang Cui, Shu-Wang Cui, Xiao-Hong Cui, Yi-Dong Cui, Ben-Zhong Dai, Hong-Liang Dai, Zigao Dai, Danzeng Luobu, Yang-Xuan Diao, Xu-Qiang Dong, Kai-Kai Duan, Jun-Hui Fan, Yi-Zhong Fan, Jun Fang, Jian-Hua Fang, Kun Fang, Cun-feng Feng, Hua Feng, Li Feng, Shaohui Feng, Xiao-ting Feng, Yi Feng, You-liang Feng, Stefano Gabici, Bo Gao, Chuan-dong Gao, Qi Gao, Wei Gao, Wei-kang Gao, Maomao Ge, Ting-Ting Ge, Lisi Geng, Gwenael Giacinti, Guanghua Gong, Quanbu Gou, Min-Hao Gu, Fu-Lai Guo, Jing Guo, Xiao-Lei Guo, Yi-Qing Guo, Ying-Ying Guo, Yi-Ang Han, Otto A Hannuksela, Mariam Hasan, Hui-Hai He, Hao-Ning He, Jia-Yin He, Xinyu He, Yu He, Sergio Hernández-Cadena, Bo-Wen Hou, Chao Hou, Xian Hou, Hong-Bo Hu, Shi-Cong Hu, Chen Huang, Dai-Hui Huang, Jiajun Huang, Tian-Qi Huang, Wen-Jun Huang, Xing-Tao Huang, Xiao-Yuan Huang, Yong Huang, Yi-Yun Huang, Xiao-Lu Ji, Huan-Yu Jia. 2024-10-11. Ultrahigh-Energy Gamma-ray Emission Associated with Black Hole-Jet Systems. https://doi.org/10.1093/nsr%2Fnwaf496
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