论文标题
自我磨碎的分子云芯中的湍流
Turbulence in a self-gravitating molecular cloud core
论文作者
论文摘要
外部驱动的星际湍流在塑造分子云中的密度结构中起着重要作用。在这里，我们研究了内部驱动的湍流在自我磨碎的分子云芯中的动态作用。根据初始条件和进化阶段，我们发现在存在重力驱动的湍流的情况下，自我磨碎的核心可以经历恒定，减速和加速的插入，因此具有各种径向速度曲线。在重力为主导的中央区域中，较高的湍流水平会导致较低的插入速度，较高的密度和较低的质量吸积率。作为这项研究的重要含义，磁场对重力阻力的有效重新连接扩散自然是由于重力驱动的湍流而无需调用外部驱动的湍流而产生的。
Externally driven interstellar turbulence plays an important role in shaping the density structure in molecular clouds. Here we study the dynamical role of internally driven turbulence in a self-gravitating molecular cloud core. Depending on the initial conditions and evolutionary stages, we find that a self-gravitating core in the presence of gravity-driven turbulence can undergo constant, decelerated, and accelerated infall, and thus has various radial velocity profiles. In the gravity-dominated central region, a higher level of turbulence results in a lower infall velocity, a higher density, and a lower mass accretion rate. As an important implication of this study, efficient reconnection diffusion of magnetic fields against the gravitational drag naturally occurs due to the gravity-driven turbulence, without invoking externally driven turbulence.
