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Paper: Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies
Volume: 373, The Central Engine of Active Galactic Nuclei
Page: 462
Authors: Suganuma, M.; Kobayashi, Y.; Yoshii, Y.; Minezaki, T.; Tomita, H.; Aoki, T.; Enya, K.; Koshida, S.; Peterson, B.A.
Abstract: We measured clear time-delayed responses of the K-band flux variations to the V-band flux variations for several well-known nearby Seyfert 1 galaxies from intense photometric monitoring observations using the MAGNUM telescope. The K-band lag time could be interpreted as light-travel time for the distance between the central engine and the inner edge of the dust torus. In the lag time versus central luminosity diagram, the K-band lag time is tightly correlated with the optical luminosity (ΔtL0.5) as expected from a dust reverberation model. Such a lag time also places an upper boundary of the similar lag times of broad-emission lines on the same diagram, which implies that the outer boundary of BLR could be defined as the inner wall of the dust torus, whose radius is determined by sublimation of the grains irradiated by the central engine.
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