Kavli Affiliate: Xuebing Wu
| 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 size of intermediate-mass black holes (IMBHs), we
carried out high-cadence, multi-band 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 Palomar/P200 spectroscopic observations, 23 years after
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 & 4 mounted on 2-meter telescopes within the Las Cumbres
Observatory Global Telescope Network. Despite the expectation of variability,
we observed no significant variation (<1.4%) on timescales of 6-10 hours. This
non-detection is likely due to substantial host galaxy light diluting the
subtle AGN variability. Dual-band preliminary tests and tailored simulations
may enhance the possibility of detecting variability and lag in future IMBH
reverberation campaigns.
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