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Hydrodynamic simulations of viscous accretion flows around black holes
Kinsuk Giri, Sandip K. Chakrabarti
We study the time evolution of a rotating, axisymmetric, viscous accretion flow around black holes using a grid based finite difference method. We use the Shakura-Sunyaev viscosity…
Composition and evolution of Interstellar Grain mantle under the effects of photo-dissociation
Ankan Das, Sandip K. Chakrabarti
We study the chemical evolution of interstellar grain mantle by varying the physical parameters of the interstellar medium (ISM). To mimic the exact interstellar condition, gas gra…
Effects of Compton Cooling on the Hydrodynamic and the Spectral Properties of a Two Component Accretion Flow around a Black Hole
Himadri Ghosh, Sudip K. Garain, Kinsuk Giri +1
We carry out a time dependent numerical simulation where both the hydrodynamics and the radiative transfer are coupled together. We consider a two-component accretion flow in which…
First VLF detections of ionospheric disturbances due to Soft Gamma ray Repeater SGR J1550-5418 and Gamma Ray Burst GRB 090424
Sandip K. Chakrabarti, Sushanta K. Mondal, Sudipta Sasmal +3
We present the first report of the detection of sudden ionospheric disturbances (SIDs) due to a Soft Gamma Ray Repeater (SGR) SGR J1550-5418 and a Gamma Ray Burst (GRB) GRB 090424.…
Permissible transitions of the variability classes of GRS 1915+105
Partha Sarathi Pal, Sandip K. Chakrabarti, Anuj Nandi
The Galactic microquasar GRS 1915+105 exhibits at least sixteen types of variability classes. Transitions from one class to another could take place in a matter of hours. In some o…