The role of viscosity in jet formation
Cassaro P., Palazzo G., Belvedere G., Lanzafame G., Zappala` R. A.
Using the SPH tecnique, we perform a time evolving model of a viscous accretion dish. We find a range of values in the Shakura-Sunyaev parameter alpha producing periodic outflows. From these results we give an explanation for the jets origin and refuelling. Moreover we are albe to estimate the mass of the black hole in AGN by comparison of model variability with observed periods in radio light curves in AGN.