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Paper IPM / Astronomy / 13927  


Abstract:  
By taking into account the effect of a toroidal magnetic field and its corresponding heating, we determine the thickness of advectiondominated accretion flows. We consider an axisymmetric, rotating, steady viscousresistive, magnetized accretion flow under an advectiondominated stage. The dominant mechanisms of energy dissipation are assumed to be turbulence viscosity and magnetic diffusivity. We adopt a selfsimilar 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 nonmagnetic case, in general the disc halfthickness, ÎÎ¸, 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 ÎÎ¸. The other one, Î·0, is the magnetic resistivity parameter and when it increases ÎÎ¸ also increases.
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