Abstract
AbstractThe Multicolor Active Galactic Nuclei Monitoring (MAGNUM) 2‐meter dedicated telescope was commissioned in early 2001 in the University of Hawaii's Lure Observatory in the Haleakala Observatories, and several tens of AGNs have been monitored since then in the optical and near‐infrared wave‐bands simultaneously. As the initial results from the MAGNUM telescope, the most intense monitoring observations yet made for two Seyfert 1 galaxies such as NGC 4151 and 5548 are presented. A delayed response of light variations in the V (0.55μm) band to those in the K(2.2μm) band was detected for each galaxy, and the lag time was measured by a cross‐correlation analysis. The measured lag time is interpreted as the light‐travel time from the central energy source to the surrounding dust torus. Compared with lag measurements of the broad emission lines in the literature, our results for such dust reverberation indicate that the broad emission‐line region is well within the inner hole of the dust torus. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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