Observational constraints on viscosity in AGN accretion discs

Details Observational constraints on viscosity in AGN accretion discs Observational constraints on viscosity in AGN accretion discs

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..289s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, July 15, 1989, p. 289-295.

Astronomy and Astrophysics

Astronomy

36

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Spectrum Analysis, Ultraviolet Spectra, Viscosity, Astronomical Models, Blazars, Quasars, Seyfert Galaxies, Thermal Instability

Scientific paper

The optical/UV/soft X-ray big bump can be modeled as thermal emission from an accretion disk. The observed UV variability in AGN spectra may be caused by accretion-disk instabilities, and can be used to constrain the viscosity. The comparison of thermal time-scales with the observed time-scales of variability in 10 Seyfert galaxies and 16 QSOs indicates values for the parameter alpha of the order of 0.01 for most cases.

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