通过粘性和冷却过程从绕黑洞的跨音速流中分离开普勒盘和亚开普勒晕
Segregation of a Keplerian disc and sub-Keplerian halo from a Transonic flow around a Black Hole by Viscosity and Cooling processes
摘要：
黑洞的吸积必然是跨音速的。在存在足够高的粘性和冷却效应的情况下，低角动量跨音速流可以成为标准的开普勒圆盘，除了靠近它必须通过内音速点的位置孔。然而，如果各处的粘度不高，并且各处的冷却效率不高，则流动无法完全成为克卜勒盘。在本文中，我们展示了严格的数值模拟结果的跨音速流具有垂直变化的粘度参数（最高的赤道平面上）和光学深度依赖的冷却过程，以表明该流确实分离成两个不同的组件，因为它接近一个黑洞。赤道平面上的分量具有标准开普勒圆盘的性质，尽管在最内侧的稳定圆轨道上流动没有被截断。这个分量作为子开普勒流一直延伸到视界。这个标准的光盘被发现是由一个热，低角动量的组成部分，形成一个离心障碍为主的振荡冲击波，与Chakrabarti-Titarchuk两个组件的平流配置相一致。
英文摘要：
A black hole accretion is necessarily transonic. In presence of sufficiently high viscosity and cooling effects, a low-angular momentum transonic flow can become a standard Keplerian disc except close to the where hole where it must pass through the inner sonic point. However, if the viscosity is not high everywhere and cooling is not efficient everywhere, the flow cannot completely become a Keplerian disc. In this paper, we show results of rigorous numerical simulations of a transonic flow having vertically varying viscosity parameter (being highest on the equatorial plane) and optical depth dependent cooling processes to show that the flow indeed segregates into two distinct components as it approaches a black hole. The component on the equatorial plane has properties of a standard Keplerian disc, though the flow is not truncated at the inner- most stable circular orbit. This component extends till the horizon as a sub-Keplerian flow. This standard disc is found to be surrounded by a hot, low angular momentum component forming a centrifugal barrier dominated oscillating shock wave, consistent with the Chakrabarti-Titarchuk two component advective flow configuration.
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