Articles written in Journal of Astrophysics and Astronomy
Volume 23 Issue 1-2 March 2002 pp 149-153
Matter accreting onto black holes suffers a standing or oscillating shock wave in much of the parameter space. The post-shock region is hot, puffed up and reprocesses soft photons from a Keplerian disc to produce the characteristic hard tail of the spectrum of accretion discs. The post-shock torus is also the base of the bipolar jets. We study the interaction of these jets with the hard photons emitted from the disc. We show that radiative force can accelerate outflows but the drag can limit the terminal speed. We introduce an equilibrium speed υeq as a function of distance, above which the flow will experience radiative deceleration.
Volume 39 Issue 1 February 2018 Article ID 0001
Volume 39 Issue 1 February 2018 Article ID 0010
We have studied shock in magnetized accretion flow/funnel flow in case of neutron star with bremsstrahlung cooling and cyclotron cooling. All accretion solutions terminate with a shock close to the neutron star surface, but at some regions of the parameter space, it also harbours a second shock away from thestar surface.We have found that cyclotron cooling is necessary for correct accretion solutions which match the surface boundary conditions.
Volume 39 Issue 1 February 2018 Article ID 0012 Review
We use moment formalism of relativistic radiation hydrodynamics to obtain equations of motion of radial jets and solve them using polytropic equation of state of the relativistic gas.We consider curved spacetime around black holes and obtain jets with moderately relativistic terminal speeds. In addition, the radiation field from the accretion disc, is able to induce internal shocks in the jet close to the horizon. Under combinedeffect of thermal as well as radiative driving, terminal speeds up to 0.75 (units of light speed) are obtained.
Volume 40 | Issue 3
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