Poster Presentation

Reverberation Mapping of AGNs with Medium-band Photometry

Author(s): Joonho Kim, Myungshin Im, Changsu Choi, and Sungyong Hwang

Presenter: Joonho Kim (Seoul National University)

Reverberation mapping is one of the best ways to investigate the physical mechanism of broad-line regions around central supermassive black holes of active galactic nuclei (AGNs). It is usually used to estimate the mass of supermassive black hole (SMBH). Although spectroscopic reverberation mapping has used to study dozens of AGNs, spectroscopic monitoring campaign of large sample is expansive. Here, we present results of photometric reverberation mapping with medium-band photometry. We monitored five nearby AGNs which were already studied with the H-alpha emission line. The observation has been performed for ~3 months with ~3 days cadence using three medium-bands installed in the LSGT (Lee Sang Gak Telescope; 0.43m). We found 0.01-0.08 magnitude variations from differential photometry and time-lags between continuum light-curves and H-alpha emission line light-curves are calculated using the JAVELIN software. The results show that our photometric study and previous spectroscopic studies are consistent within the uncertainty range. From verification of availability in this study, photometric reverberation mapping seems useful to study large AGN samples with larger telescopes in the near future.