论文标题
分子云之间的碰撞I.云病毒比在正面碰撞中的影响
Collision between Molecular Clouds I. The effect of the cloud virial ratio in head-on collisions
论文作者
论文摘要
在一系列论文中，我们研究了湍流分子云之间对其结构，进化和恒星形成活性的碰撞的影响。在本文中，我们研究了云的初始病毒比率的作用。检查了三种不同的方案：两种云最初绑定，一个云绑定和一个未结合，两个云最初都没有结合。一个或两个云的模型生成沿碰撞轴对齐的丝状结构，并在位置位置和位置 - 固定空间中辨别。如果云都没有绑定，则不会产生细丝。与以前对光滑云之间碰撞的模拟不同，由于碰撞发生前的湍流中产生的子结构，碰撞碰撞耗散动能的耗散非常低效，在我们的模拟中都不是足够的大量动能而丢失以呈现云的结合。模拟这两种云的绑定创建的构成是恒星质量的两倍，并且两种情况都产生了比两种云没有结合的模拟的恒星质量。还将每个仿真与对照运行进行比较，在该对照运行中，云不会碰撞。我们发现界限碰撞增加了总体恒星的形成效率大约相对于对照组的倍数，但是边界碰撞碰撞会产生较小的增加，并且碰撞对未结合的云 - 云碰撞的影响很小。
In a series of papers we investigate the effect of collisions between turbulent molecular clouds on their structure, evolution and star formation activity. In this paper we look into the role of the clouds' initial virial ratios. Three different scenarios were examined: both clouds initially bound, one cloud bound and one unbound, and both clouds initially unbound. Models in which one or both clouds are bound generate filamentary structures aligned along the collision axis and discernible in position-position and position--velocity space. If neither cloud is bound, no filaments result. Unlike in previous simulations of collisions between smooth clouds, owing to the substructure created in the clouds by turbulence before the collisions, dissipation of kinetic energy by the collision is very inefficient and in none of our simulations is sufficient bulk kinetic energy lost to render the clouds bound. Simulations where both clouds are bound created twice as much stellar mass than the bound-unbound model, and both these scenarios produced much more stellar mass than the simulation in which both clouds are unbound. Each simulation was also compared with a control run in which the clouds do not collide. We find the bound-bound collision increases the overall star formation efficiency by a factor of approximately two relative to the control, but that the bound-unbound collision produces a much smaller increase, and the collision has very little effect on the unbound--unbound cloud collision.
