Kavli Affiliate: Luis C. Ho
| First 5 Authors: Wenwen Zuo, Hengxiao Guo, Jingbo Sun, Qi Yuan, Paulina Lira
| Summary:
To investigate the short-term variability and determine the size of the
optical continuum emitting region of intermediate-mass black holes (IMBHs), we
carried out high-cadence, multiband photometric monitoring of a Seyfert 1
galaxy J0249-0815 across two nights, together with a one-night single-band
preliminary test. The presence of the broad Ha component in our target was
confirmed by recent Paloma spectroscopic observations, 23 years after the Sloan
Digital Sky Survey, ruling out the supernovae origin of the broad Ha line. The
photometric experiment was primarily conducted utilizing four-channel imagers
MuSCAT 3 and 4 mounted on 2 m telescopes within the Las Cumbres Observatory
Global Telescope Network. Despite the expectation of variability, we observed
no significant variation (<1.4%) on timescales of 6 to 10 hr. This nondetection
is likely due to substantial host galaxy light diluting the subtle active
galactic nucleus (AGN) variability. Additionally, we cannot rule out that the
target was in a relatively quiescent state without intranight variability
during our monitoring, owing to the stochastic nature of AGN variations. To
enhance the possibility of detecting subtle variability signals and lag in
future IMBH reverberation campaigns, it may be beneficial to select targets
with a higher AGN-to-host flux ratio, and conduct dual-band preliminary tests
and tailored simulations.
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