Studies of dissipative standing shock waves around black holes

Abstract

We investigate the dynamical structure of advective accretion flow around stationary as well as rotating black holes. For a suitable choice of input parameters, such as, accretion rate ($\dot{\mathcal{M}}$) and angular momentum ($\lambda$), global accretion solution may include a shock wave. The post shock flow is located at few tens of Schwarzchild radius and it is generally very hot and dense. This successfully mimics the so called Compton cloud which is believed to be responsible for emitting hard radiations. Due to the radiative loss, a significant energy from the accreting matter is removed and the shock moves forward towards the black hole in order to maintain the pressure balance across it. We identify the effective area of the parameter space ($\dot{\mathcal{M}}-\lambda$) which allows accretion flows to have some energy dissipation at the shock $(\Delta \mathcal{E})$. As the dissipation is increased, the parameter space is reduced and finally disappears when the dissipation is reached its critical value. The dissipation has a profound effect on the dynamics of post-shock flow. By moving forward, an unstable shock whose oscillation causes Quasi-Periodic Oscillations (QPOs) in the emitted radiation, will produce oscillations of high frequency. Such an evolution of QPOs has been observed in several black hole candidates during their outbursts.

13 pages, 5 figures, accepted by MNRAS

References in corpus (4)

• Evolution of the quasi-periodic oscillation frequency in GRO J1655-40 -- Implications for accretion disk dynamics
• Behaviour of dissipative accretion flows around black holes
• Accretion flow behaviour during the evolution of the Quasi Periodic Oscillation Frequency of XTE J1550-564 in 1998 outburst
• Computation of mass loss from viscous accretion disc in presence of cooling

Cited by in corpus (10)

• Estimation of mass outflow rates from dissipative accretion disc around rotating black holes
• Dynamical structure of magnetized dissipative accretion flow around black holes
• Is Compton cooling sufficient to explain evolution of observed quasi-periodic oscillations in Outburst sources?
• Properties of magnetically supported dissipative accretion flow around black holes with cooling effects
• Spectral signatures of dissipative standing shocks and mass outflow in presence of Comptonization around a black hole
• Advective accretion flow properties around rotating black holes - application to GRO J1655-40
• Low Frequency Quasi Periodic Oscillations and Shocks in Accretion onto Black Hole
• Standing shocks in magnetized advection accretion flows onto a rotating black hole
• Effect of magnetic flux advection on the dynamics of shock in accretion flow around a rotating black hole
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow