NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-25 T08:20:17 PDT
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For refcode 2007MNRAS.380..669C:
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NED Abstract

Copyright by Royal Astronomical Society. 2007MNRAS.380..669C Testing thermal reprocessing in active galactic nuclei accretion discs Edward M. Cackett, Keith Horne and Hartmut Winkler Abstract. The thermal reprocessing hypothesis in active galactic nuclei (AGN), where extreme ultraviolet/X-ray photons are reprocessed by the accretion disc into optical/UV photons, predicts wavelength-dependent time-delays between the optical continuum at different wavelengths. Recent photometric monitoring by Sergeev et al. has shown that the time-delay is observed in 14 AGN, and generally seen to increase with increasing wavelength, as predicted in the reprocessing scenario. We fit the observed time-delays and optical spectral energy distribution using a disc reprocessing model. The model delivers estimates for the nuclear reddening, the product of black hole mass and accretion rate, and the distance to each object. However, the distances at face value give H_0_ = 44 +/- 5 km s^-1^ Mpc^-1^ - a factor of 1.6 smaller than generally accepted. We discuss the implications of this on the reprocessing model. Key words: galaxies: active, galaxies: nuclei, galaxies: Seyfert
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