Optical Continuum Reverberation in the Dwarf Seyfert Nucleus of NGC 4395
ASTROPHYSICAL JOURNAL LETTERS(2022)
摘要
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 Haleakala 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) 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 tau proportional to lambda (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 tau (gz) proportional to 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.
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关键词
dwarf seyfert nucleus,optical continuum reverberation,ngc
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