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【Academic Forum】Black Hole Accretion Disk Magnetic Field Acceleration Outflow Model and Its Application in Active Galactic Nuclei and Black Hole X-ray Binary Stars

Source:Date:2020-11-23

Topic: Black Hole Accretion Disk Magnetic Field Acceleration Outflow Model and Its Application in Active Galactic Nuclei and Black Hole X-ray Binary Stars

Lecturer: Cao Xinwu, professor of Zhejiang University and winner of the National Science Fund for Distinguished Young Scholars

Host: Professor Zhang Jianfu

Time: 19:30 – 21:00, November 24 (Tuesday), 2020

Venue: Meeting Room 201, Physics Building

Abstract

The accretion disk magnetic field acceleration outflow model has a wide range of application value in astrophysics. This report briefly introduces the basic physical image and research status of the model, and some research progress in this field in recent years. It will give physical model explanations for some puzzling astronomical observation phenomena, including the cause of the hysteretic state transition of black hole X-ray binaries; and, the reason why only a few quasars have relativistic jets while the high state of the corresponding black hole X-ray binary star has no jets.

Profile

Cao Xinwu, male, is a researcher, professor, and doctoral supervisor. He won the National Science Fund for Distinguished Young Scholars in 2003, and is currently a “Qiushi” Distinguished Professor of Zhejiang University. He received a Ph.D. in Science from the University of Science and Technology of China in 1994. He made research visits to the Max Planck Institute for Astrophysics in Germany and the Department of Astrophysics at University of Oxford in England. He is mainly engaged in research on the frontier topics of astrophysics such as nuclear structure and evolution of active galaxies and black hole accretion jets, and has achieved a series of research results.

In theory, the black hole accretion disk jet is an important subject in astrophysics research. He and his collaborators solved a basic theoretical problem in the accretion disk magnetic field acceleration jet model, and gave the quantitative relationship between the accretion disk magnetic field strength, configuration, and temperature of the accretion material of the accretion disk, and the mass loss rate and the velocity of the jet, as well as the stability of the accretion disk. They found that the relationship between FRI and FRII galaxies is not a simple evolutionary relationship. The pointing effect is very important for FR galaxies. Research on X-ray background radiation found that the accretion rate of active galactic nuclei has a rapid decline, indicating that the central giant black hole grows extremely slowly in the late stage of active galactic nucleus. These results were published in the top international academic journals of astrophysics.