论文标题
块状磁盘和BLR云的热传导
Thermal Conduction in Clumpy Disks and BLR clouds
论文作者
论文摘要
我们通过考虑导热率来研究与以对流为主的积聚流相交的团块的动力学。热传导可能是ADAF能源运输的有效因素之一；因此，它可能会通过它们与宿主介质之间的接触力间接影响团块的动力学。我们首先通过将团块作为无碰撞颗粒来研究团块的集合，其次，我们发现这些云作为个体的轨道运动。对于这两个部分，团块都受到中心物体的重力和阻力。团块和ADAF之间的强耦合导致团块的平均处理与其背景动力学之间的平等性。通过使用无碰撞的玻尔兹曼方程，我们计算了团块的速度分散，结果证明比ADAF高约一个数量级。实际上，在这样的系统中涉及阻力会导致团块的角动量被ADAF向外运输，因此云最终将在潮汐半径处捕获。结果表明，热传导的存在增加了平均径向速度平方的根，这反过来又加快了通过潮汐力捕获云的过程。最后，我们专注于典型的单个云，螺旋轨道仅归功于摩擦力的环形成分。参数研究再次证明，热传导的运行有助于降低团块的寿命。
We investigate the dynamics of clumps that coexisted with/in advection-dominated accretion flows by considering thermal conductivity. Thermal conduction can be one of the effective factors in the energy transportation of ADAFs; hence it may indirectly affect the dynamics of clumps by means of a contact force between them and their host medium. We first study the ensemble of clumps by assuming them as collision-less particles and secondly we find the orbital motion of these clouds as individuals. For both parts, clumps are subject to the gravity of the central object and a drag force. The strong coupling between clumps and ADAF leads to equality between the average treatment of the clumps and the dynamics of their background. By employing the collision-less Boltzmann equation we calculate the velocity dispersion of the clumps which turns out approximately one order of magnitude higher than the ADAF. In fact, involving drag force in such a system causes the angular momentum of the clumps can be transported outwards by the ADAF, and hence the clouds eventually will be captured at the tidal radius. The results show that the presence of thermal conduction increases the root of the averaged radial velocity square and this in turn speeds up the process of capturing the clouds through the tidal force. In the end, we focus on a typical individual cloud, the spiral orbits appear thanks to only the toroidal component of friction force. The parametric study again proves that the operation of thermal conduction helps for decreasing the lifetime of clumps.
