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Paper IPM / Astronomy / 14113  


Abstract:  
We solve the set of hydrodynamic equations for optically thin advectiondominated accretion flows by assuming a radially selfsimilar spherical coordinate system (r, q, f). The disk is considered to be in steady state and
axisymmetric. We define the boundary conditions at the pole and the equator of the disk and, to avoid singularity at the rotation axis, the disk is taken to be symmetric with respect to this axis. Moreover, only the trf component of
the viscous stress tensor is assumed, and we have set vq = 0. The main purpose of this study is to investigate the variation of dynamical quantities of the flow in the vertical direction by finding an analytical solution. As a consequence, we found that the advection parameter, f adv, varies along the ÃÂ¸ direction and reaches its maximum near the rotation axis. Our results also show that, in terms of the nooutflow solution, thermal equilibrium still exists and consequently advection cooling can balance viscous heating.
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