Radio observations of fast variations in microquasars 微类星体快速光变的射电观测研究
speaker: Wei Wang (武汉大学)
place: KIAA-Auditorium
time: 2023年9月21日(星期四)15:30—16:30

报告摘要Microquasars are the compact objects generally including accreting black holes 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 the special dynamics of relativistic jets. In addition, we also at first time discover the similar oscillation beharviors of both flux and polarization in jets, which should provide a clear picture on the inner engine and magnetic configuration of relativistic jets. In near future, high time resolution radio monitoring of microquasars is expected to discover more new phenomena in black hole systems.

主讲人简介Wei Wang now is the professor at Depart of Astronomy, School of Physics and Technology, Wuhan University. He obtained the PhD at the Max-Planck Institute for Extraterrestrial Physics in Germany in 2007. Then he joined in the National Astronomical Observatories, CAS in Beijing as the Research Professor, and moved to Wuhan University in 2017. His research interest includes high energy astrophysics, black holes, pulsars, neutron stars, supernova and supernova remnants, cosmic rays and nuclear astrophysics. Prof. Wang has published more than 90 research papers in international peer-reviewed journals including Nature, Nature Communications, ApJ, MNRAS. He is also the co-PI and core member of the Chinese astronomical projects, like Insight-HXMT, LHAASO, FAST and EP.