On the origin of the continuum radiation at optical and ultraviolet wavelengths in AGN/quasars

Details On the origin of the continuum radiation at optical and ultraviolet wavelengths in AGN/quasars On the origin of the continuum radiation at optical and ultraviolet wavelengths in AGN/quasars

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991msngr..63...52u&link_type=abstract

ESO Messenger (ISSN 0722-6691), no. 63, p. 52-54.

Astronomy and Astrophysics

Astronomy

Active Galactic Nuclei, Continuous Radiation, Quasars, Ultraviolet Astronomy, Visible Spectrum, Error Analysis, Seyfert Galaxies, X Ray Astronomy

Scientific paper

Two processes for the rapid and simultaneous optical and UV continuum variations in AGN/quasars are proposed. The variations are due to local instabilities in the inner part of the disk which produce small hot regions emitting mostly in the FUV but which contribute to the optical flux through the low energy tail of their spectrum. This results in a nearly perfect modulation of the UV and optical flux. Alternatively, the UV/optical variations could be due to irradiation of the disk by a central variable X-ray source.

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