AGN通过尘埃红外主导流的遮蔽。II。多维辐射流体动力学模型
AGN obscuration through dusty infrared dominated flows. II. Multidimensional, radiation-hydrodynamics modeling
摘要:
我们探讨了一个详细的模型,其中的活动星系核(AGN)遮蔽的结果,在全球流驱动的尘埃颗粒上的红外辐射的压力,活动星系核辐射的消光。我们假设,在距离超大质量黑洞约1 pc处的尘埃气体的紫外线和软X射线的外部照射之后,这种辐射转换为IR。使用2.5D,时间相关的辐射流体动力学模拟通量-在有限扩散近似下,我们发现外部照明可以通过活动星系核中红外辐射压力驱动的外流来支持几何上厚的遮蔽,光度大于$0.05\, L_{\rm edd}$和康普顿光学深度$τ_{\rm T}\gtrsim 1$。
英文摘要:
We explore a detailed model in which the active galactic nucleus (AGN) obscuration results from the extinction of AGN radiation in a global flow driven by the pressure of infrared radiation on dust grains. We assume that external illumination by UV and soft X-rays of the dusty gas located at approximately 1pc away from the supermassive black hole is followed by a conversion of such radiation into IR. Using 2.5D, time-dependent radiation hydrodynamics simulations in a flux-limited diffusion approximation we find that the external illumination can support a geometrically thick obscuration via outflows driven by infrared radiation pressure in AGN with luminosities greater than $0.05\, L_{\rm edd}$ and Compton optical depth, $τ_{\rm T}\gtrsim 1$.
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