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IPM
30
YEARS OLD

“School of Astronomy”

Paper   IPM / Astronomy / 11160
   School of Astronomy
  Title: The role of thermal conduction in magnetized viscous-resistive ADAFs
  Author(s):
1 . J. Ghanbari
2 . S. Abbassi
3 . M. Ghasemnezhad
  Status: Published
  Journal: MNRAS
  Vol.: 400
  Year: 2009
  Supported by: IPM
  Abstract:
Observations of the hot gas that surrounds Sgr A* and a few other nearby galactic nuclei imply that the mean free paths of electrons and protons are comparable to the gas capture radius. Hot accretion flows therefore likely proceed under weak collision conditions. As a result, thermal conduction by ions has a considerable contribution to the transfer of the realized heat in accretion mechanisms. We study a two-dimensional advective accretion disc bathed in the poloidal magnetic field of a central accretor in the presence of thermal conduction.We find selfsimilar solutions for an axisymmetric, rotating, steady, viscous?resistive,magnetized accretion flow. The dominant mechanism of energy dissipation is assumed to be turbulent viscosity and magnetic diffusivity due to the magnetic field of the central accretor. We show that the global structure of advection-dominated accretion flows (ADAFs) is sensitive to viscosity, advection and thermal conduction parameters. We discuss how the radial flow, angular velocity and density of accretion flows may vary with the advection, thermal conduction and viscous parameters.

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