Oral Presentation
Photometric Reverberation Mapping with Wide-Field IFU Telescope and Medium-bands
Presenter: Sungyong Hwang (Seoul National University)
The mass of supermassive black holes (SMBHs) is important in many cosmological study. The
reverberation mapping is one of the method to measure the black hole mass. However, the reverberation
mapping requires long time baseline of monitoring observation in order to measure the variability of
the emission line and continuum flux. It was usually conducted by spectroscopic observation, which
consumes high cost and is hard to monitor multiple objects. In this paper, we used medium-band
and wide-field telescope to monitor mulitple objects through Intensive Monitoring Survey of Nearby
Galaxies (IMSNG). We measured the time lag of 14 emission lines for the 11 quasars and 1 Seyfert 1
galaxy using the JAVELIN and PyCCF. The results are consistent with the previous study in terms of
the R-L relation, except for some Hγ time lags. They showed shorter time lag than expected with given
luminosity. This is consistent with the photionization expectation. However, the He I time lags did
not show any shortened lag, which is expected by photoionization model. We measured the accretion
rate of targets in order to find out the lag shortening with high accretion rate target. One Hβ target
showed marginally high accretion rate (∼ 2) with shortened lag. We measured the black hole mass of
the targets and compared the result with the single epoch estimation method. The black hole mass
from the reverberation mapping of various lines showed similar result with the single epoch estimation
using Hβ line, except for the result using Hγ lines. Therefore, measuring the black hole mass with Hγ
needs caution.
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