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Paper   IPM / Astronomy / 13927
School of Astronomy
Title:   The effect of toroidal magnetic field on the thickness of a viscous-resistive hot accreting flow
Author(s):
 1 M. Samadi 2 S. Abbassi 3 M. Khajavi
Status:   Published
Journal: MNRAS
Vol.:  439
Year:  2014
Pages:   9
Supported by:  IPM
Abstract:
By taking into account the effect of a toroidal magnetic field and its corresponding heating, we determine the thickness of advection-dominated accretion flows. We consider an axisymmetric, rotating, steady viscous-resistive, magnetized accretion flow under an advection-dominated stage. The dominant mechanisms of energy dissipation are assumed to be turbulence viscosity and magnetic diffusivity. We adopt a self-similar assumption in the radial direction to obtain the dynamical quantities, i.e. radial, azimuthal, sound and AlfvÃ©n velocities. Our results show that the vertical component of magnetic force acts in the opposite direction to gravity and compresses the disc; thus, compared with the non-magnetic case, in general the disc half-thickness, ÎÎ¸, is significantly reduced. On the other hand, two parameters that appear due to the action of the magnetic field and reaction of the flow affect the disc thickness. The first one, Î²0, which shows the magnetic field strength at the equatorial plane, decreases ÎÎ¸. The other one, Î·0, is the magnetic resistivity parameter and when it increases ÎÎ¸ also increases.

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