Constraints on viscosity in accretion disks from UV variability in AGNS

Details Constraints on viscosity in accretion disks from UV variability in AGNS Constraints on viscosity in accretion disks from UV variability in AGNS

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..691c&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 691-69

Astronomy and Astrophysics

Astrophysics

4

Accretion Disks, Active Galactic Nuclei, Seyfert Galaxies, Ultraviolet Spectra, Viscosity, Astronomical Models, Iue, Luminosity

Scientific paper

The influence of accretion disk instabilities on the UV fluxes of Seyfert 1 galaxies was studied. The observed characteristic timescales of variability are consistent with the interpretation that most of the UV radiation originates in an accretion disk, and that thermal instabilities in the disk are responsible for the luminosity changes. However, another possible explanation is changes in absorption due to intervening clouds from the broad line region (BLR). In order to distinguish between these two hypotheses, more detailed predictions of the time dependence of the continuum in different wavelength regions as well as of the reaction of the BLR, are necessary.

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