AGN obscuration from winds: from dusty infrared-driven to warm and X-ray
  photoionized
  We present calculations of AGN winds at ~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 72-75 degrees regardless of the luminosity. At L > 0.1 L_edd 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 > 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.
