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We study the properties of two-temperature accretion flow around a non-rotating black hole in presence of various dissipative processes where pseudo-Newtonian potential is adopted to mimic the effect of general relativity. The flow…

High Energy Astrophysical Phenomena · Physics 2018-02-14 Indu K. Dihingia , Santabrata Das , Samir Mandal

We investigate the global structure of the advection dominated accretion flow around a Schwarzschild black hole where the accretion disc is threaded by toroidal magnetic fields. We consider synchrotron radiative process as an effective…

High Energy Astrophysical Phenomena · Physics 2017-11-29 Biplob Sarkar , Santabrata Das , Samir Mandal

We study the global structure of optically thin, advection dominated, magnetized accretion flow around black holes. We consider the magnetic field to be turbulent in nature and dominated by the toroidal component. With this, we obtain the…

High Energy Astrophysical Phenomena · Physics 2016-06-15 Biplob Sarkar , Santabrata Das

We examine the effects of thermal conduction on relativistic, magnetized, viscous, advective accretion flows around rotating black holes considering bremsstrahlung and synchrotron cooling processes. Assuming the toroidal component of…

High Energy Astrophysical Phenomena · Physics 2025-04-28 Monu Singh , Camelia Jana , Santabrata Das

We investigate the viscous two temperature accretion discs around rotating black holes. We describe the global solution of accretion flows with a sub-Keplerian angular momentum profile, by solving the underlying conservation equations…

High Energy Astrophysical Phenomena · Physics 2015-05-14 S. R. Rajesh , Banibrata Mukhopadhyay

We explore the global structure of the accretion flow around a Schwarzschild black hole where the accretion disc is threaded by toroidal magnetic fields. The accretion flow is optically thin and advection dominated. Synchrotron radiation is…

High Energy Astrophysical Phenomena · Physics 2018-03-14 Biplob Sarkar , Santabrata Das

Simplified assumptions about the thermodynamics of the electrons are normally employed in general-relativistic magnetohydrodynamic (GRMHD) simulations of accretion onto black holes. To counter this, we have developed a self-consistent…

High Energy Astrophysical Phenomena · Physics 2022-11-16 Indu K. Dihingia , Yosuke Mizuno , Christian M. Fromm , Luciano Rezzolla

We present the global structure of magnetized advective accretion flow around the rotating black holes in presence of dissipation. By considering accretion flow to be threaded by toroidal magnetic fields and by assuming synchrotron…

High Energy Astrophysical Phenomena · Physics 2018-08-08 Santabrata Das , Biplob Sarkar

Matter falling onto black holes is hot, fully ionized and has to be necessarily transonic. Since the electrons are responsible for radiative cooling via processes like synchrotron, bremsstrahlung and inverse-Compton, therefore the electron…

High Energy Astrophysical Phenomena · Physics 2019-02-20 Shilpa Sarkar , Indranil Chattopadhyay

We examine the effect of variable viscosity parameter ($\alpha$) in relativistic, low angular momentum advective accretion flow around rotating black holes. Following the recent simulation studies of magnetohydrodynamic disk that reveal the…

High Energy Astrophysical Phenomena · Physics 2023-12-27 Monu Singh , Santabrata Das

We investigate the properties of low angular momentum, relativistic, viscous, advective accretion flows around rotating black holes that include shock waves in the presence of thermal conduction. We self-consistently solve the governing…

High Energy Astrophysical Phenomena · Physics 2024-08-06 Monu Singh , Santabrata Das

We study global transonic solution for a relativistic, magnetized, viscous advective accretion flow around a rotating black hole, incorporating the effects of mass and angular momentum loss through winds. Our model considers dominant…

High Energy Astrophysical Phenomena · Physics 2026-04-17 Camelia Jana , Santabrata Das

We investigate the transition of a radiatively inefficient phase of a viscous two temperature accreting flow to a cooling dominated phase and vice versa around black holes. Based on a global sub-Keplerian accretion disc model in steady…

High Energy Astrophysical Phenomena · Physics 2014-11-20 Monika Sinha , S. R. Rajesh , Banibrata Mukhopadhyay

We present the global solutions of low angular momentum, inviscid, advective accretion flow around Kerr-Taub-NUT (KTN) black hole in presence and absence of shock waves. These solutions are obtained by solving the governing equations that…

High Energy Astrophysical Phenomena · Physics 2022-08-30 Gargi Sen , Debaprasad Maity , Santabrata Das

We investigate two-temperature accretion flows onto strongly magnetized compact stars. Matter is accreted in the form of an accretion disc upto the disc radius ($r_{\rm d}$), where, the magnetic pressure exceeds both the gas and ram…

High Energy Astrophysical Phenomena · Physics 2023-04-19 Shilpa Sarkar , Kuldeep Singh , Indranil Chattopadhyay , Philippe Laurent

We investigate the dynamical behaviour of a magnetized, dissipative, accretion flow around a rapidly rotating black hole. We solve the magnetohydrodynamic equations and calculate the transonic accretion solutions which may contain…

High Energy Astrophysical Phenomena · Physics 2020-04-15 Biplob Sarkar , Anjali Rao

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 supported shock transition that effectively produces a…

High Energy Astrophysical Phenomena · Physics 2015-09-23 Ramiz Aktar , Santabrata Das , Anuj Nandi

We investigate the behaviour of dissipative accreting matter close to a black hole as it provides the important observational features of galactic and extra-galactic black holes candidates. We find the complete set of global solutions in…

Astrophysics · Physics 2008-11-26 Santabrata Das

Plasmas in an accretion flow are heated by MHD turbulence generated through the magneto-rotational instability. The viscous stress driving the accretion is intimately connected to the microscopic processes of turbulence dissipation. We show…

Astrophysics · Physics 2007-07-04 Siming Liu , Christopher L. Fryer , Hui Li

We study the relativistic, time-independent, low angular momentum, inviscid, advective accretion flow around Kerr black hole. Considering the relativistic equation of state (REoS), we examine the transonic properties of the flow and find…

High Energy Astrophysical Phenomena · Physics 2019-01-23 Indu K. Dihingia , Santabrata Das , Anuj Nandi
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