风引起的AGN遮蔽:从尘埃红外驱动到温暖和X射线光电离
AGN obscuration from winds: from dusty infrared-driven to warm and X-ray photoionized
摘要:
我们目前的计算活动星系核风在秒差距尺度,以及相关的遮蔽。我们考虑了红外辐射对尘埃颗粒的压力和来自中心黑洞的X射线与热、冷等离子体的相互作用。红外辐射(IR)被纳入采用通量限制扩散近似的辐射流体动力学模拟。我们发现,在X射线亮度L=0.05 - 0.6 L_edd的范围内,康普顿厚度的流动部分(又称环面)的张角约为72-75度,与亮度无关。当L > 0.1L_edd时,外流的沙尘风提供了遮蔽,而红外气压起主要作用。全球气流由两个阶段组成:倾角θ> 70 °时的冷气流和倾角较低时的低密度热电离风。热风的动力压力在形成密集的红外支持流方面是重要的。在光度<0.1 L_edd的外流事件之后,当风切换到缓慢吸积的延长时期。
英文摘要:
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 θ> 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.
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