磁旋转Turbulence模拟倾斜黑洞吸积盘中俘获波的激发
Excitation of Trapped Waves in Simulations of Tilted Black Hole Accretion Disks with Magnetorotational Turbulence
摘要：
我们分析了广义相对论磁流体动力学模拟中流体变量的时间依赖性，模拟了无量纲自旋参数a/M=0.9的黑洞的吸积流。我们考虑吸积材料的角动量与黑洞自旋轴对齐（非倾斜流）和错位15度（倾斜流）的情况。与未倾斜的模拟相比，倾斜的模拟表现出明显过量的惯性可变性，即在低于局部径向周转频率的频率处的可变性。我们进一步研究了这种类似惯性的功率的径向结构，重点是在三个分析的流体变量中发现的118（M/10 Msol）^-1 Hz处的径向扩展带。在该频率下的三维密度结构表明，功率是一种复合振荡，其主要成分是与背景流共转的过密团块，低阶惯性波和低阶惯性声波。我们的研究结果提供了初步确认早期的建议，磁盘倾斜可以是一个重要的激发机制的惯性波。
英文摘要：
We analyze the time dependence of fluid variables in general relativistic, magnetohydrodynamic simulations of accretion flows onto a black hole with dimensionless spin parameter a/M=0.9. We consider both the case where the angular momentum of the accretion material is aligned with the black hole spin axis (an untilted flow) and where it is misaligned by 15 degrees (a tilted flow). In comparison to the untilted simulation, the tilted simulation exhibits a clear excess of inertial variability, that is, variability at frequencies below the local radial epicyclic frequency. We further study the radial structure of this inertial-like power by focusing on a radially extended band at 118 (M/10Msol)^-1 Hz found in each of the three analyzed fluid variables. The three dimensional density structure at this frequency suggests that the power is a composite oscillation whose dominant components are an over dense clump corotating with the background flow, a low order inertial wave, and a low order inertial-acoustic wave. Our results provide preliminary confirmation of earlier suggestions that disk tilt can be an important excitation mechanism for inertial waves.
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