Echo mapping of the radial temperature structure in AGN accretion discs

Details Echo mapping of the radial temperature structure in AGN accretion discs Echo mapping of the radial temperature structure in AGN accretion discs

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..431..227w&link_type=abstract

Accretion processes in astrophysical systems: Some like it hot! - eigth astrophysics conference. AIP Conference Proceedings, Vo

Astronomy and Astrophysics

Astrophysics

Active And Peculiar Galaxies And Related Systems, Infall, Accretion, And Accretion Disks, Astronomical Observations

Scientific paper

We present results from a recent intensive monitoring campaign of the Seyfert-1 galaxy NGC 7469 where we have discovered time delays between the continuum flux variations in different wavelength bands. The variations at 6925 Å lag those at 1315 Å by almost 2 days. Intermediate wavelengths show smaller lags, and the time delay τ can be described as a function of wavelength λ according to τ~λ4/3, which is what a standard thin accretion disc, irradiated by a hot central source, would predict. This is strong evidence for the existence of accretion discs in active galactic nuclei, and the wavelength-dependence of the time delay can be used to sample the radial temperature structure of the disc.

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