3/31演講取消(延後至5月19日舉辦)
修課同學請自行觀看老師在LMS發佈之替代影片以及報告之繳交
Colloquium
Department of Physics, NCU
The Macro- and Microphysics of Supermassive Black Hole Feedback
Prof. Hsiang-Yi Karen Yang (楊湘怡)
Dept. of Physics, NTHU
Date 2020.03.31 (Tue)
Place S4-625
Time 13:30-15:00
Abstract:
Energetic feedback by relativistic jets from supermassive black holes (SMBHs) is influential for the cosmic evolution of massive galaxies and galaxy clusters. In particular, there is strong observational evidence that SMBH jets can heat the gas within galaxy clusters and prevent them from cooling catastrophically. However, it remains elusive how exactly the jet energy is converted into heat and how the heat is distributed, and many of these processes are dependent on the “microphysics” — physics that is not resolvable and not captured by purely hydrodynamic simulations. In this talk, I will share with you insights that we gained over the past few years from numerical simulations including the microphysical mechanisms. Specifically, I will first talk about standard picture of SMBH heating by momentum-driven jets on the macroscopic level. Then I will discuss how the microphysics of cosmic rays could affect the feedback processes and the macroscopic properties of clusters.