Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373..462s&link_type=abstract
The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,
Physics
1
Scientific paper
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 (Δ t ∝ L0.5) 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.
Aoki Tadao
Enya Keigo
Kobayashi Yasuaki
Koshida Shintaro
Minezaki Takeo
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