@article{montano_guo_barth_u_remigio_gonzález-buitrago_hernández santisteban_2022,
title={Optical Continuum Reverberation in the Dwarf Seyfert Nucleus of NGC 4395},
volume={934},
DOI={10.3847/2041-8213/ac7e54},
abstractNote={Abstract
In order to constrain the size of the optical continuum emission region in the dwarf Seyfert 1 galaxy NGC 4395 through reverberation mapping, we carried out high-cadence photometric monitoring in the griz filter bands on two consecutive nights in 2022 April using the four-channel MuSCAT3 camera on the Faulkes Telescope North at Haleakalā Observatory. Correlated variability across the griz bands is clearly detected, and the r-, i-, and z-band light curves show lags of
7.72
−
1.09
+
1.01
,
14.16
−
1.25
+
1.22
, and
20.78
−
2.09
+
1.99
minutes with respect to the g band when measured using the full-duration light curves. When lags are measured for each night separately, the Night 2 data exhibit lower cross-correlation amplitudes and shorter lags than the Night 1 light curves. Using the full-duration lags, we find that the lag–wavelength relationship is consistent with the τ ∝ λ
4/3 dependence found for more luminous active galactic nuclei. Combining our results with continuum lags measured for other objects, the lag between g and z band scales with optical continuum luminosity as τ
gz ∝ L
0.56±0.05, similar to the scaling of broad-line region size with luminosity, reinforcing recent evidence that diffuse continuum emission from the broad-line region may contribute substantially to optical continuum variability and reverberation lags.},
publisher={American Astronomical Society},
author={Montano, John W. and Guo, Hengxiao and Barth, Aaron J. and U, Vivian and Remigio, Raymond and González-Buitrago, Diego H. and Hernández Santisteban, Juan V.},
year={2022},
month={Aug}
}