Quasi-periodic oscillations in black hole X-ray binaries
Tsung-Dao Lee Institute/S4F-SW - Open Area
Tsung-Dao Lee Institute
Host: Yosuke Mizuno
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Abstract:
Black hole X-ray binaries (BHXRBs, also named as 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 prominent 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 provides 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 behaviors of both flux and polarization oscillations in jets, which should provide a new picture on plasma dynamics or instability occurring in relativistic magnetized jets, which is important to understand the inner engine and magnetic configuration of jets. In near future, high time resolution both radio and X-ray monitorings of BHXRBs are expected to discover more new phenomena in black hole systems.
Biography:
Prof. Wei Wang now is the professor at Department 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 120 research papers in international peer-reviewed journals, and is the co-PI and core member of the Chinese astronomical projects, like Insight-HXMT, LHAASO, FAST, EP and SVOM.
