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  • “School of Astronomy”

     
    Paper   IPM / Astronomy / 13061
       School of Astronomy
      Title: The Effect of Toroidal Magnetic Field on Thickness of a Viscose-Resistive Hot Accreting Flow
      Author(s):
    1 . M. Samadi
    2 . S. Abbassi
    3 . M. Khajavi
      Status: Published
      Journal: MNRAS
      Vol.: 437
      Year: 2014
      Supported by: IPM
      Abstract:
    By taking into account the effect of toroidal magnetic field and its correspond heating, we determine the thickness of advection-dominated accretion flows. We consider an axisymetric, rotating, steady viscous-resistive, magnetized accretion flow under an advection dominated stage. The dominant mechanism of energy dissipation is assumed to be turbulence viscosity and magnetic diffusivity. We adopt a self-similar assumption in the radial direction to obtain the dynamical quantities, that is, radial, azimuthal, sound and Alfvén velocities. Our results show the vertical component of magnetic force acts in the opposite direction of gravity and compresses the disc, thus compared with the non-magnetic case, in general the disc half-thikness, ∆θ, significantly is reduced. On the other hand, two parameters, appearing due to action of magnetic field and reaction of the flow, affect the disc thickness. The first one , β0, showing the magnetic field strength at the equatorial plane, decreases ∆θ. The other one, η0 is the magnetic resistivity parameter and when it increases, ∆θ increases, too.

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