On the wind production from hot accretion flows with different accretion rates

Abstract

We perform two-dimensional simulations to study how the wind strength changes\nwith accretion rate. We take into account bremsstrahlung, synchrotron radiation\nand the Comptonization. We find that when the accretion rate is low, radiative\ncooling is not important, the accretion flow is hot accretion flow. For the hot\naccretion flow, wind is very strong. The mass flux of wind can be $\\sim 50\\%$\nof the mass inflow rate. When the accretion rate increases to a value at which\nradiative cooling rate is roughly equal to or slightly larger than viscous\nheating rate, cold clumps can form around the equatorial plane. In this case,\nthe gas pressure gradient force is small and wind is very weak. Our results may\nbe useful for the sub-grid model of active galactic nuclear feedback study.\n