Talk detail

Participant	Nagarkoti, Shreeram
Institution	Indian Centre for Space Physics - Garia Station Road - Kolkata - West Bengal - India

Session	AC1	Accepted		Order	Time
Talk	Oral abstract	Title	Estimation of Viscosity Parameter in Accretion Flows Around a Black Hole in Presence of Shock Waves
Coauthors
Abstract	We study the hydrodynamics of steady state viscous, axisymmetric, transonic accretion flows around a Schwarzschild black hole. We adopt a viscosity parameter (described by Shakura & Sunyaev, 1973) and compute the highest possible value of the viscosity parameter for each pair of two inner boundary parameters (namely, specific angular momentum and specific energy of the flow) which is still capable of producing a standing shock. We find that while shocks can still form for the parameter as high as 0.3 in smaller regions of the flow parameter space, its typical value appears to be about 0.05-0.1 which is also the typical viscosity parameters achieved by magnetorotational instabilities in accretion flows.
Pdf file

Session	AC1	Accepted		Order	Time
Talk	Poster abstract	Title	Estimating the value of Viscosity Parameter in Accretion Flows Around a Black Hole in Presence of Shock Waves with cooling
Coauthors
Abstract	We study the hydrodynamics of steady state viscous, axisymmetric, transonic accretion flows around a Schwarzschild black hole. We adopt a viscosity parameter (described by Shakura & Sunyaev, 1973) and compute the highest possible value of the viscosity parameter for each pair of two inner boundary parameters (namely, specific angular momentum and specific energy of the flow) which is still capable of producing a standing shock. We find that while shocks can still form for the parameter as high as 0.3 in smaller regions of the flow parameter space, its typical value appears to be about 0.05-0.1 which is also the typical viscosity parameters achieved by magnetorotational instabilities in accretion flows.
Pdf file