Radiatively and thermally driven self-consistent bipolar outflows from accretion discs around compact objects

Abstract

We investigate the role of radiative driving of shock-ejected bipolar outflows from advective accretion discs in a self-consistent manner. Radiations from the inner disc affects the subsonic part of the jet while those from the pre-shock disc affects the supersonic part, and there by constitutes a multistage acceleration process. We show that the radiation from the inner disc not only accelerate but also increase the mass outflow rate, while the radiation from the preshock disc only increases the kinetic energy of the flow. With proper proportions of these two radiations, very high terminal speed is possible. We also estimated the post-shock luminosity from the pre-shock radiations, and showed that with the increase of viscosity parameter the disc becomes more luminous, and the resulting jet simultaneously becomes faster. This mimics the production of steady mildly relativistic but stronger jets as microquasars move from low-hard to intermediate-hard spectral states.