论文标题
3D流体力学模拟机械反馈对超音速恒星质量黑洞中积聚的影响
3D hydrodynamical simulations of the impact of mechanical feedback on accretion in supersonic stellar-mass black holes
论文作者
论文摘要
孤立的恒星质量BH增生气体通常以超音速速度，并且会形成流出的流出，从而影响积聚的气体。后一个过程被称为机械反馈，可以显着影响积聚率。我们使用流体动力学模拟来评估当BH通过均匀培养基辅助移动时，机械反馈对积聚率的影响。我们进行了3D流体动力学模拟，以与均匀培养基相互作用的增生助长的流出，探测尺度与增生性重力球相似和大。在模拟中，积聚器处于静止状态，培养基以超音速速度移动。假定流出功率与积聚率成正比。这些模拟用于不同的流出中等运动角度和速度比。还研究了不同程度的流出准直，增生大小和分辨率的影响。通常，积聚率受到机械反馈的显着影响。该效果很小，对于垂直于中等运动的流出，并迅速增长了较小的角度。此外，中流速速度比的越小，积聚的降低越多。另一方面，流出准直的影响似乎是中等的。当增生器尺寸降低时，效果会增强。对于具有随机流出取向的BH群体，与没有流出的情况相比，中等流出速度速度比分别为1/20和1/100的平均积聚率〜0.2-0.4和〜0.1-0.2分别下降。我们的结果强烈表明，在经过考虑的尺度上，机械反馈可以轻松地将超音速积聚的能量减少几个。在研究孤立BH的机械，热和非热输出时，应考虑这一点。
Isolated stellar-mass BH accrete gas, often at supersonic speeds, and can form outflows that can influence the accreted gas. The latter process, known as mechanical feedback, can significantly affect the accretion rate. We use hydrodynamical simulations to assess the impact of mechanical feedback on the accretion rate when the BH moves supersonically through a uniform medium. We carry out 3D hydrodynamical simulations of outflows fueled by accretion that interact with a uniform medium, probing scales similar to and larger than the accretor gravitational sphere of influence. In the simulations the accretor is at rest and the medium moves at supersonic speeds. The outflow power is assumed to be proportional to the accretion rate. The simulations are run for different outflow-medium motion angles and velocity ratios. The impact of different degrees of outflow collimation, accretor size, and resolution is also investigated. In general, the accretion rate is significantly affected by mechanical feedback. The effect is small for outflows perpendicular to the medium motion, and quickly grows for smaller angles. Moreover, the smaller the medium-to-outflow velocity ratio is, the more accretion decreases. On the other hand, the impact of outflow collimation seems moderate. The effect is enhanced when the accretor size is reduced. For a population of BH with random outflow orientations, the average accretion rate drops by (high-low resolution) ~0.2-0.4 and ~0.1-0.2 for medium-to-outflow velocity ratios of 1/20 and 1/100, respectively, when compared to the corresponding cases without outflow. Our results strongly indicate that, on the considered scales, mechanical feedback can easily reduce the energy available from supersonic accretion by a factor of several. This should be taken into account when studying the mechanical, thermal and non-thermal output of isolated BH.
