6 papers
Hybrid disc geometry for shocked accretion flows: Unveiling QPOs in black hole X-ray binaries
Monu Singh, Sudip Kumar Garain, Santabrata Das
We investigate the efficacy of semi-analytical global accretion solutions in capturing the flow properties observed in two-dimensional numerical simulations of shocked accretion on…
Simulation based parameter space for shock in transonic, sub-Keplerian accretion flow onto non-rotating black holes
Aishi Dasadhikary, Sudip K Garain
Non-dissipative, transonic, sub-Keplerian accretion flow onto black holes is characterized by two conserved parameters: specific energy and specific angular momentum of the flow. F…
Bridging X-ray Polarization with Timing & Spectroscopic Parameters of a galactic black hole: Swift J1727.8-1613
Arka Chatterjee, Sujoy K. Nath, Kaushik Chatterjee +5
We report the discovery of a correlated energy-dependent time lag and degree of polarization for Swift J1727.8-1613 during its 2023 outburst. The energy-dependent time lag is measu…
Outflow from unmagnetized shocked radiative transonic accretion disk around a black hole
Arghya Chaudhuri, Apurba Ghosh, Sudip K Garain
We study outflow from an unmagnetized, shocked accretion disk around a non-rotating super-massive black hole using multidimensional hydrodynamics simulation with radiative cooling.…
A general relativistic hydrodynamic simulation code for studying advective, sub-Keplerian accretion flow onto black holes
Sudip K Garain
In this paper, we describe a general relativistic hydrodynamics simulation code which is developed to simulate advective accretion flow onto black holes. We are particularly intere…
General Relativistic Hydrodynamic Simulations around Accreting Black Holes
Sudip K Garain, Pranayjit Dey
Strong gravity in the immediate vicinity of compact objects (e.g., black holes, neutron stars) necessitates inclusion of general relativistic effects. Traditionally, pseudo-Newtoni…