Seoul National University AGN Monitoring Project. V. Velocity-resolved Hβ Reverberation Mapping and Evidence of Kinematics Evolution

April 2025 • 2025ApJ...983...45W

Authors • Wang, Shu • Woo, Jong-Hak • Barth, Aaron J. • Bennert, Vardha N. • Gallo, Elena • Hodges-Kluck, Edmund • Kim, Minjin • Rakshit, Suvendu • Treu, Tommaso • Cho, Hojin • Kabasares, Kyle M. • Malkan, Matthew A. • Mandal, Amit Kumar • Son, Donghoon • U, Vivian • Villafana, Lizvette

Abstract • We present velocity-resolved reverberation lags of Hβ for 20 active galactic nuclei (AGNs) from the Seoul National University AGN Monitoring Project. We detect unambiguous velocity-resolved structures in 12 AGNs, among which eight objects exhibit symmetric structures, two objects show inflow-like characteristics, and two objects display outflow-like signatures. For two AGNs, we successfully measure the velocity-resolved lags in different years, revealing evidence of evolving broad-line region (BLR) kinematics. By combining our sample with the literature velocity-resolved lags, we find that the symmetric velocity-resolved lags are the most common (40%) type among this sample. The frequency of inflow kinematics is also notable (20%), while outflow kinematics are less common (11%). Our sample significantly expands the previous velocity-resolved reverberation mapping sample in the high-luminosity regime, enabling us to constrain BLR kinematics across a large dynamic range of luminosity.

Links

• PDF https://iopscience.iop.org/article/10.3847/1538-4357/adbca5/pdf
• PREPRINT http://arxiv.org/abs/2505.15073
• ELECTR https://doi.org/10.3847/1538-4357/adbca5