论文标题
几何薄盘对进攻，厚流的影响：与C型QPO相关
Effect of geometrically thin discs on precessing, thick flows: Relevance to type-C QPOs
论文作者
论文摘要
C型准周期振荡（QPO）是在X射线二元系统的硬光谱状态中最常观察到的低频QPO。这些QPO的主要模型是热，几何厚的吸积流的晶状体进动，相对于黑洞旋转轴未对准。但是，迄今为止所做的一项工作都没有说明周围的，几何薄的光盘对这种进动的影响，就像在硬状态的截断光盘图片中一样。为了解决这个问题，我们对截短的圆盘进行了一组GRMHD模拟，该圆盘未对准其中央黑洞的旋转轴。我们的结果证实，内部热量仍在进行进动，尽管速率仅为孤立的，进攻的圆环所预测的速度的5％。我们发现，外部，薄和内部厚的圆盘之间角动量的交换会导致进动速率下降，并讨论其与C型QPO的相关性。
Type-C quasi-periodic oscillations (QPOs) are the low-frequency QPOs most commonly observed during the hard spectral state of X-ray binary systems. The leading model for these QPOs is the Lense-Thirring precession of a hot, geometrically thick accretion flow that is misaligned with respect to the black hole spin axis. However, none of the work done to date has accounted for the effects of a surrounding, geometrically thin disc on this precession, as would be the case in the truncated disc picture of the hard state. To address this, we perform a set of GRMHD simulations of truncated discs misaligned with the spin axes of their central black holes. Our results confirm that the inner-hot flow still undergoes precession, though at a rate that is only 5 percent of what is predicted for an isolated, precessing torus. We find that the exchange of angular momentum between the outer, thin and the inner, thick disc causes this slow-down in the precession rate and discuss its relevance to type-C QPOs.
