47 citations · 215 across the 17 of their papers we have counts for
18 papers
Improved analysis of time delays between radio wavelengths and X-ray of Sgr A* flares in the shock oscillation model
Ramiz Aktar, Toru Okuda, Chandra B. Singh
We present an improved analysis of the time delays between radio and X-ray flares from the supermassive black hole Sagittarius A* (Sgr A*), extending our previous shock oscillation…
Three-dimensional Global Relativistic Radiation Magnetohydrodynamics of Magnetically Arrested Disk Accretion Flows in AGNs
Ramiz Aktar, Kuo-Chuan Pan, Toru Okuda
We perform three-dimensional radiation-relativistic magnetohydrodynamic (3D Rad-RMHD) simulations of accretion flows around spinning active galactic nuclei (AGNs). Our study focuse…
Magnetohydrodynamic Simulations of Transonic Accretion Flows
Raj Kishor Joshi, Antonios Tsokaros, Sanjit Debnath +2
Theoretical studies of transonic accretion onto black holes reveal a wide range of possible solutions, broadly classified into smooth flows and flows featuring shocks. Accretion so…
Global resistive MHD accretion flows around spinning AGNs: impact of resistivity on MAD state
Ramiz Aktar, Kuo-Chuan Pan, Toru Okuda
In this study, we investigate the effect of resistivity on the dynamics of global magnetohydrodynamic accretion flows (Res-MHD) around a spinning supermassive black hole. We perfor…
Radiation RMHD accretion flows around spinning AGNs: a comparative study of MAD and SANE state
Ramiz Aktar, Kuo-Chuan Pan, Toru Okuda
In our study, we examine a 2D radiation, relativistic, magnetohydrodynamics (Rad-RMHD) accretion flows around a spinning supermassive black hole. We begin by setting an initial equ…
Evolution of MHD Torus and Mass Outflow Around Spinning AGN
Ramiz Aktar, Kuo-Chuan Pan, Toru Okuda
We perform axisymmetric, two-dimensional magnetohydrodynamic (MHD) simulations to investigate accretion flows around spinning AGN. To mimic the space-time geometry of spinning blac…
Spiral shocks induced in galactic gaseous disk: hydrodynamic understanding of observational properties of spiral galaxies
Ramiz Aktar, Li Xue, Li-Xin Zhang +1
We investigate the properties of spiral shocks in a steady, adiabatic, non-axisymmetric, self-gravitating, mass-outflowing accretion disk around a compact object. We obtain the acc…
Time delays between radio and X-ray and between narrow radio bands of Sgr A* flares in the shock oscillation model
Toru Okuda, Chandra B. Singh, Ramiz Aktar
We examine the time delay between radio and X-ray and between narrow radio frequency flares in Sagittarius A* (Sgr A*), from analyses of the synchrotron, bremsstrahlung and monochr…
Radiative shock oscillation model for the long-term flares of Sgr A*
T. Okuda, C. B. Singh, R. Aktar
We examine time-dependent 2D relativistic radiation MHD flows to develop the shock oscillation model for the long-term flares of Sgr A*. Adopting modified flow parameters in additi…
On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow
Santabrata Das, Anuj Nandi, C. S. Stalin +5
We study the relativistic, inviscid, advective accretion flow around the black holes and investigate a key feature of the accretion flow, namely the shock waves. We observe that th…
Point-wise Self-similar Solution for Spiral Shocks in Accretion Disk with Mass Outflow in Binary
Ramiz Aktar, Li Xue, Tong Liu
We examine the properties of spiral shocks from a steady, adiabatic, non-axisymmetric accretion disk around a compact star in binary. We first time incorporate all the possible inf…
Effects of resistivity on standing shocks in low angular momentum flows around black holes
Chandra B. Singh, Toru Okuda, Ramiz Aktar
We study two dimensional low angular momentum flow around the black hole using the resistive magnetohydrodynamic module of PLUTO code. Simulations have been performed for the flows…
A Possible Model for the Long-Term Flares of Sgr A*
Toru Okuda, Chandra B. Singh, Santabrata Das +3
We examine the effects of magnetic field on low angular momentum flows with standing shock around black holes in two dimensions. The magnetic field brings change in behavior and lo…
Accretion-ejection in rotating black holes: a model for `outliers' track of radio-X-ray correlation in X-ray binaries
Ramiz Aktar, Anuj Nandi, Santabrata Das
We study the global accretion-ejection solutions around a rotating black hole considering three widely accepted pseudo-Kerr potentials that satisfactorily mimic the space-time geom…
Accretion Flow Dynamics During 1999 Outburst of XTE J1859+226 - Modeling of Broadband Spectra and Constraining the Source Mass
A. Nandi, S. Mandal, H. Sreehari +6
We examine the dynamical behavior of accretion flow around XTE J1859+226 during the 1999 outburst by analyzing the entire outburst data ( 166 days) from RXTE Satellite. Towar…
Advective accretion flow properties around rotating black holes - application to GRO J1655-40
Ramiz Aktar, Santabrata Das, Anuj Nandi +1
We examine the properties of the viscous dissipative accretion flow around rotating black holes in presence of mass loss. Considering thin disc approximation, we self-consistently…
Estimation of mass outflow rates from dissipative accretion disc around rotating black holes
Ramiz Aktar, Santabrata Das, Anuj Nandi +1
We study the properties of the dissipative accretion flow around rotating black holes in presence of mass loss. We obtain the complete set of global inflow-outflow solutions in the…
Mass loss from advective accretion disc around rotating black holes
Ramiz Aktar, Santabrata Das, Anuj Nandi
We examine the properties of the outflowing matter from an advective accretion disc around a spinning black hole. During accretion, rotating matter experiences centrifugal pressure…