Tidal disruptions of supermassive black hole binaries in galaxy mergers
Tsung-Dao Lee Institute/S4F-SW - Open Area
Tsung-Dao Lee Institute
Host: Zhen Pan
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Abstract:
Galaxy mergers are the direct descendents of the Λ cold dark matter cosmology. There are many close connections between central supermassive black holes (SMBHs) and their host galaxies, which indicates that SMBHs play very important roles in the formation and evolution of galaxies. During the merging of galaxies and the formation of the supermassive black hole binary (SMBHB), black holes and surrounding stars undergo a dramatic evolution, which results in very complicated evolution of SMBHs, stars and other compact objects. Due to the gas poor environment and the limited spatial resolution in observations, it is very difficult to find clues of these systems in quiescent galaxies. However, a close encounter of a star with one of the supermassive black holes (SMBHs) may tidally disrupt it to produce a tidal disruption event (TDE) and temporarily light up the SMBH. TDEs by SMBHBs should be significantly different from the cases by single SMBHs. By using direct N-body simulations and scattering experiments, we investigate TDEs by SMBHBs and find that both the statistical event rates and specific light curves from SMBHB systems are significantly different from the cases in isolated galaxies.
Biography:
Shuo Li received his Ph.D. in Astrophysics from Peking University in 2011. From 2011 to 2015, he conducted postdoctoral research at the National Astronomical Observatories, Chinese Academy of Sciences, where he has remained ever since and currently holds the position of Associate Research Professor. His main research focuses on the co-evolution of supermassive black hole binaries and their host galaxies, as well as their observational signatures. This includes, but is not limited to, the evolution and characteristics of special physical processes in binary black hole systems, such as tidal disruption events, hypervelocity stars, and extreme mass ratio inspirals. Li Shuo is proficient in GPU-accelerated direct N-body simulations. He has extensive experience applying these methods to study topics such as the co-evolution of recoiling black holes formed during supermassive black hole mergers and their host galaxies, as well as the evolution of tidal disruption event rates in merging galaxies hosting supermassive black hole binaries.
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