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Paper: Time Delays in NGC 4151
Volume: 290, Active Galactic Nuclei: from Central Engine to Host Galaxy
Page: 119
Authors: Oknyanskij, V. L.; Horne, K.; Lyuty, V. M.; Sadakane, K.; Honda, S.; Tanabe, S.
Abstract: Photometric UBVRI monitoring of NGC 4151 are used to measure wavelength-dependent time delays and variability amplitudes. The time delay increases with wavelength. In a blackbody reprocessing model, this implies temperatures decreasing with radius.
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