Vol 12, No 12

Hydrodynamical wind in magnetized accretion flows with convection

Shahram Abbassi, Amin Mosallanezhad


Abstract The existence of outflow and magnetic fields in the inner region of hot accretion flows has been confirmed by observations and numerical magnetohydrodynamic (MHD) simulations. We present self-similar solutions for radiatively inefficient accretion flows (RIAFs) around black holes in the presence of outflow and a global magnetic field. The influence of outflow is taken into account by adopting a radius that depends on mass accretion rate with s > 0. We also consider convection through a mixing length formula to calculate convection parameter αcon. Moreover we consider the additional magnetic field parameters βr,φ,z [= c2r,φ,z/(2c2s )], where c2r,φ,z are the Alfvén sound speeds in three directions of cylindrical coordinates. Our numerical results show that by increasing all components of the magnetic field, the surface density and rotational velocity increase, but the sound speed and radial infall velocity of the disk decrease. We have also found that the existence of wind will lead to reduction of surface density as well as rotational velocity. Moreover, the radial velocity, sound speed, advection parameter and the vertical thickness of the disk will increase when outflow becomes important in the RIAF.


Keywords accretion: accretion flow — wind: outflow — convection: MHD

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