科研之友
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摘要
We present calculations of active galactic nucleus winds at similar to parsec scales along with the associated obscuration. We take into account the pressure of infrared radiation on dust grains and the interaction of X-rays from a central black hole with hot and cold plasma. Infrared radiation (IR) is incorporated in radiation-hydrodynamic simulations adopting the flux-limited diffusion approximation. We find that in the range of X-ray luminosities L = 0.05-0.6 L-Edd, the Compton-thick part of the flow (aka torus) has an opening angle of approximately 72 degrees-75 degrees regardless of the luminosity. At L greater than or similar to 0.1, the outflowing dusty wind provides the obscuration with IR pressure playing a major role. The global flow consists of two phases: the cold flow at inclinations theta greater than or similar to 70 degrees and a hot, ionized wind of lower density at lower inclinations. The dynamical pressure of the hot wind is important in shaping the denser IR-supported flow. At luminosities <= 0.1 L-Edd episodes of outflow are followed by extended periods when the wind switches to slow accretion.
- 出版日期2012-12-10
