Extreme AGNs and Transients: When Black Holes Misbehave

Session

AGNs

4 Aug 2025, 15:00

The University of Hong Kong

7. The Dichotomy in the Nuclear and Host Galaxy Properties of High-redshift Quasars

Dr Ruancun Li (Peking University)

04/08/2025, 15:00

The early growth of high-redshift quasars and their host galaxies raises critical questions about their cosmic evolution. We exploit the angular resolution and sensitivity of NIRCam to investigate the host galaxies of 31 quasars at $4\lesssim z\lesssim7$ drawn from multiple JWST surveys. Using a new multi-band forward-modeling code (\textsc{GalfitS}) that incorporates physically motivated...

24. NLS1

Chichuan Jin (National Astronomical Observatories, Chinese Academy of Sciences)

06/08/2025, 12:00

2. VLTI/GRAVITY Interferometric Insights of AGN Inner Structure

Prof. Jinyi Shangguan (Peking University)

07/08/2025, 09:30

Accurate supermassive black hole (SMBH) mass measurements are essential for understanding their formation and coevolution with host galaxies. Recent advances with the GRAVITY instrument on the Very Large Telescope Interferometer have revolutionized our ability to study active galactic nuclei (AGNs) and luminous quasars at unprecedented angular resolution. In this talk, I will present GRAVITY...

8. Measuring Accretion Disk Inclination and Mass Inflow Rates via Broadband SED Fitting

Mr Rong Du

07/08/2025, 11:00

We present a unified study of inner accretion disk geometry and mass accretion rates in active galactic nuclei (AGNs) using multiwavelength nuclear spectral energy distribution (SED) fitting. First, by applying a self‑consistent X‑ray reflection model to joint XMM‑Newton and NuSTAR observations, we determine the inner disk inclination, $\theta_{\rm disk}$, with high precision—supported by...