제목: Understanding black hole engine based on time-domain studies​​​​​​​​​​​​​

장소: 과학관 B101호 

Abstract:

Mass-accreting massive black holes are presumably the most energetic and dynamic sources in the universe, not to mention that they are also  an important ingredient of galaxies. However, our understanding of the central engine of active galactic nuclei (AGNs) is mainly limited due to the lack of proper spatial resolution. In this talk I will discuss how we can unveil the structure of black hole engine via time-domain studies. First, I will present a couple of exciting results from the Seoul National University AGN Monitoring Project (SAMP), which was carried out for six years, (2016-2021), and discuss our on-going variability studies for measuring the size of accretion disk and torus. Second, I will discuss the changing-look AGNs, which are currently challenging the orientation-based unification model of AGNs. In particular I will present our new discovery of changing-look AGNs based on the variability characteristic analysis and spectroscopic confirmation.​