Poster Title: What triggers the activity cycle in galactic nuclei?
Abstract: We present a theoretical study of a time evolution of an accretion disk around a supermassive black hole. In a certain range of temperatures, the disk may be subject to the hydrogen ionization instability. This causes an on-off activity cycle, which amplitude is substantially high if either the efficiency of angular momentum transport varies between the active and quiescent phases, or if the innermost disk temporarily evaporates and forms radiatively inefficient ADAF. We demonstrate, that the second possibility is more suitable, since the strength of MHD turbulence implies that the viscosity parameter is constant throughout the whole instability cycle.
Link to poster: N/A