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Equilibrium configuration and stability of a stratus floating above accretion disks

机译：吸积盘上方漂浮的层的平衡构型和稳定性

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摘要

We examine the equilibrium configurations of a stratus floating above an accretion disk, using the radiative force from the luminous disk just below the stratus. For various disk luminosities and optical depths of the stratus, the stratus can stably float on the outer disk, while a stable configuration does not exist on the inner disk. When the disk luminosity normalized by the Eddington luminosity is unity, and the stratus optical depth is around unity, the stable configuration disappears at r less than or similar to 50r(g), r(g) being the Schwarzschild radius, and the stratus would be blown off as a cloudy wind, which consists of many strati with appropriate conditions. In the outer region of r >= 50r(g), on the other hand, we find that the stable floating height is z similar to 20r(g), which is approximately two times larger than in the case of the particle. This difference is due to the anisotropic scattering effect; the stratus can get twice the momentum from radiation than it can in the particle case. The present results, that the radiation-driven cloudy wind can be easily blown off from the luminous disk, can explain observed outflows in broad absorption line quasars and ultra-fast outflow objects.
机译：我们使用来自层下方的发光盘的辐射力来检查浮在吸积盘上方的层的平衡构型。对于层的各种盘亮度和光学深度，层可以稳定地漂浮在外盘上，而内盘上不存在稳定的构造。当通过爱丁顿光度归一化的圆盘光度为1，并且层光学深度约为1时，稳定构型在r小于或等于50r（g）时消失，r（g）为Schwarzschild半径，并且层会作为多云的风吹散，其中包括许多处于适当条件下的地层。另一方面，在r> = 50r（g）的外部区域中，我们发现稳定的浮动高度为z，类似于20r（g），大约是粒子情况下的两倍。这种差异是由于各向异性散射效应引起的。层的辐射动量是粒子情况下的两倍。目前的结果是，辐射驱动的多云风很容易从发光盘上吹走，这可以解释在宽吸收线类星体和超快速外流物体中观察到的外流。

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