Abstract：Microquasars are the compact objects generally including accreting black holes (BHs) which produce relativitic jets. The physical mechanisms of jet launching, collimation, and acceleration are poorly understood. Microquasars show strong variability in multi-wavelength observations. In X-rays, the sources show the fast variation features up to millisecond time scales, with the prominant quasiperiodic oscillations (QPOs) around 1 Hz - tens of Hz in light curves, however, physical origin of QPOs is still uncertain. FAST as the largest radio telescope provide the opportunity to study fast variability of both radio flux and polarization in microquasars. Firstly, we reported the first evidence of subsecond quasi-periodic oscillations of GRS 1915+105 in the radio band, providing the direct link between QPOs and relativistic jets. In addition, we also at first time discover the polarization quasiperiodic oscillation in the BH system. The similar beharviors of both flux and polarization oscillations in jets, which should provide a new picture on plasma dynamincs or instability occuring in relativisitic magnetized jets, which is important to understand the inner engine and magnetic configuration of jets. In near future, high time resolution radio monitoring of microquasars is expected to discover more new phenomena in black hole systems.
Bio：王伟，武汉大学物理科学与技术学院天文学系教授，博士生导师。2000年毕业于南京大学天文学系，2003年在中国科学院国家天文台获硕士学位，2007年在德国马普地外物理研究所和慕尼黑工业大学获博士学位。2007年回国家天文台工作，任副研究员和研究员，2017年调入武汉大学建设天文学系。期间多次访问德国马普地外物理研究所、香港大学、澳大利亚莫纳什大学等开展合作研究。主要从事高能天体物理研究，包括黑洞和中子星X射线双星，脉冲星，磁星，超新星遗迹，宇宙线，核天体物理等，至今发表学术论文120余篇，参与慧眼，EP，FAST，LHAASO等科学项目，目前主持国家自然科学基金委重点项目，科技部重点研发计划等项目。