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Using AGN variability to study BH mass growth and accretion physics is a key science goal of time-domain surveys. Reverberation mapping (RM) has been the primary method for direct BH mass estimation. It reveals an important empirical relation between the broad-line region (BLR) size and continuum luminosity, enabling the single-epoch BH mass estimation that is crucial for high-redshift AGNs and large-sample studies. However, as the RM sample grows, this relation has exhibited increasing scatter and complexity. In this talk, I will revisit the Hβ size-luminosity relation by combining data from 32 high-luminosity AGNs from SAMP with a uniform lag reanalysis of >200 archival AGNs. Our findings reveal a larger scatter and a shallower slope than the expected 0.5. We further explore the impact of different luminosity tracers. Next, I will present our study on disk and torus sizes using continuum RM, providing a more comprehensive picture of AGN structures. Finally, I will discuss our efforts in identifying and tracking changing-look AGNs using time-domain survey data. Future time-domain surveys from next-generation spectroscopic facilities, e.g., JUST, will offer unprecedented opportunities to refine BH mass scaling relations and uncover extreme variability events, advancing our understanding of BH accretion and evolution.
Shu Wang received his bachelor and PhD from Peking University. He joined the Seoul National University (SNU) AGN Monitoring Project (SAMP) as a postdoctoral researcher, and obtained the SNU Science Fellowship in 2022. His main research interests include BH mass estimation, and accretion disk mapping, changing-look AGNs, and high-redshift AGNs. He was involved in the SDSS reverberation mapping project, the SAMP collaboration, and is a member of LSST AGN Science Collaboration. He is interested in using time-domain surveys to expand our understanding of AGN variability and BH mass estimation.
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