Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070
Creators: name: You, Bei
name: Tuo, Yuoli
name: Li, Chengzhe
name: Wang, Wei
name: Zhang, Shuang-Nan
name: Zhang, Shu
name: Ge, Mingyu
name: Luo, Chong
name: Liu, Bifang
name: Yuan, Weimin
name: Dai, Zigao
name: Liu, Jifeng
name: Qiao, Erlin
name: Jin, Chichuan
name: Liu, Zhu
name: Czerny, Bozena
name: Wu, Qingwen
name: Bu, Qingcui
name: Cai, Ce
name: Cao, Xuelei
name: Chang, Zhi
name: Chen, Gang
name: Chen, Li
name: Chen, Tianxiang
name: Chen, Yibao
name: Chen, Yong
name: Chen, Yupeng
name: Cui, Wei
name: Cui, Weiwei
name: Deng, Jingkang
name: Dong, Yongwei
name: Du, Yuanyuan
name: Fu, Minxue
name: Gao, Guanhua
name: Gao, He
name: Gao, Min
name: Gu, Yudong
name: Guan, Ju
name: Guo, Chengcheng
name: Han, Dawei
name: Huang, Yue
name: Huo, Jia
name: Jia, Shumei
name: Jiang, Luhua
name: Jiang, Weichun
name: Jin, Jing
name: Jin, Yongjie
name: Kong, Lingda
name: Li, Bing
name: Li, Chengkui
name: Li, Gang
name: Li, Maoshun
name: Li, Tipei
name: Li, Wei
name: Li, Xian
name: Li, Xiaobo
name: Li, Xufang
name: Li, Yanguo
name: Li, Zhengwei
name: Liang, Xiaohua
name: Liao, Jinyuan
name: Liu, Congzhan
name: Liu, Guoqing
name: Liu, Hongwei
name: Liu, Xiaojing
name: Liu, Yinong
name: Lu, Bo
name: Lu, Fangjun
name: Lu, Xuefeng
name: Luo, Qi
name: Luo, Tao
name: Ma, Xiang
name: Meng, Bin
name: Nang, Yi
name: Nie, Jianyin
name: Ou, Ge
name: Qu, Jinlu
name: Sai, Na
name: Shang, Rencheng
name: Song, Liming
name: Song, Xinying
name: Sun, Liang
name: Tan, Ying
name: Tao, Lian
name: Wang, Chen
name: Wang, Guofeng
name: Wang, Juan
name: Wang, Lingjun
name: Wang, Wenshuai
name: Wang, Yusa
name: Wen, Xiangyang
name: Wu, Baiyang
name: Wu, Bobing
name: Wu, Mei
name: Xiao, Guangcheng
name: Xiao, Shuo
name: Xiong, Shaolin
name: Xu, Yupeng
name: Yang, Jiawei
name: Yang, Sheng
name: Yang, Yanji
name: Yi, Qibin
name: Yin, Qianqing
name: You, Yuan
name: Zhang, Aimei
name: Zhang, Chengmo
name: Zhang, Fan
name: Zhang, Hongmei
name: Zhang, Juan
name: Zhang, Tong
name: Zhang, Wanchang
name: Zhang, Wei
name: Zhang, Wenzhao
name: Zhang, Yi
name: Zhang, Yifei
name: Zhang, Yongjie
name: Zhang, Yue
name: Zhang, Zhao
name: Zhang, Ziliang
name: Zhao, Haisheng
name: Zhao, Xiaofan
name: Zheng, Shijie
name: Zhou, Dengke
name: Zhou, Jianfeng
name: Zhu, Yuxuan
name: Zhu, Yue
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A black hole X-ray binary produces hard X-ray radiation from its corona and disk when the accreting matter heats up. During an outburst, the disk and corona co-evolves with each other. However, such an evolution is still unclear in both its geometry and dynamics. Here we report the unusual decrease of the reflection fraction in MAXI J1820+070, which is the ratio of the coronal intensity illuminating the disk to the coronal intensity reaching the observer, as the corona is observed to contrast during the decay phase. We postulate a jet-like corona model, in which the corona can be understood as a standing shock where the material flowing through. In this dynamical scenario, the decrease of the reflection fraction is a signature of the corona's bulk velocity. Our findings suggest that as the corona is observed to get closer to the black hole, the coronal material might be outflowing faster.
description: 11 pages, 5 figures; published in Nature Communications; An artist's impression of Figure 5 is updated here, and the animation is available at http://youbei.work/research/