论文标题
对流的时间依赖性主导着旋转紧凑的物体的积聚流
Time dependence of advection dominated accretion flow around a rotating compact object
论文作者
论文摘要
提出了旋转紧凑型物体周围为主导的积聚流量（ADAF）的时间演变。得出了包括科里奥利力的流体方程以及离心力和压力梯度力的方程。在这项研究中，假定角动量转运是由于粘性湍流引起的，并且α-主张用于粘度的运动学系数。此外，一般的相对论效应被忽略了。为了求解方程，我们使用了一个自相似的解决方案。该解决方案表明，动态ADAF中物理量的行为与稳定的吸积流不同。我们的结果表明，物理量取决于旋转参数，该参数定义为中央体内固有角速度与圆盘的角速度的比率。同样，对于CO和反向旋转流，旋转参数对这些量的影响是不同的。该解决方案表明，通过增加旋转参数A，流出流域接近中心对象以进行共旋转流，并向外移动以进行反向旋转流动。我们发现，当流动完全占主导地位（F！1）时，整个气体具有正bernoulli函数。另外，我们建议，当旋转对椎间盘结构的影响降低时，Bernoulli函数变得更加积极。
Time evolution of advection-dominated accretion flow (ADAF) around a rotating compact object is presented. The equations of time-dependent of fluid including the Coriolis force along with the centrifugal and pressure gradient forces are derived. In this research, it is assumed that angular momentum transport is due to viscous turbulence and the α-prescription is used for the kinematic coefficient of viscosity. Moreover, the general relativistic effects are neglected. In order to solve the equations, we have used a self-similar solution. The solutions show that the behaviour of the physical quantities in a dynamical ADAF is different from that for a steady accretion flow. Our results indicate that the physical quantities are dependent of rotation parameter which is defined as the ratio of the intrinsic angular velocity of the central body to the angular velocity of disc. Also, the effect of rotation parameter on these quantities is different for co and counter-rotating flows. The solution shows that by increasing the rotation parameter a, inflow-outflow region approaches the central object for co-rotating flow and moves outward for counter-rotating flow. We find that when flow is fully advection dominated (f ! 1), the entire gas has positive Bernoulli function. Also, we suggest that the Bernoulli function becomes more positive when the effect of rotation on the structure of disc decreases.
