Disk Truncation in AGN: The Influence of Viscosity

Details Disk Truncation in AGN: The Influence of Viscosity Disk Truncation in AGN: The Influence of Viscosity

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373..137n&link_type=abstract

The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,

Physics

Scientific paper

We use the disk-corona model tep{st01} to investigate how the viscosity affects the truncation of the disk in low-luminosity AGN (LLAGN) and hard/soft spectral state transitions in AGN. Previous studies tep{st02} show that the corona structure depends strongly on the value of viscosity. We attempt to do detailed calculations of the coronal structure for a series of viscous coefficients. We give an analytical fitting formula for the maximal mass evaporation rate as a function of the viscosity α. The corresponding truncation radius is also fitted as a function of the viscosity. Our results may improve the interpretation of spectral transition between soft and hard states, and the truncation radius in LLAGN.

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