The influence of grains on the propagation and structure of C-type shock waves in interstellar molecular clouds
The influence of grains on the propagation and structure of C-type shock waves in interstellar molecular clouds
复制标题
星际分子云中颗粒对C型激波传播和结构的影响
DOI：
10.1046/j.1365-8711.2003.06716.x
复制
发表时间：
2003
影响因子：
4.8
通讯作者：
G. P. Forêts
中科院分区：
文献类型：
--
作者：
D. Flower;G. P. Forêts
气体-颗粒相互作用对分子云中冲击波传播的物理和化学有重要影响。颗粒可以是分子的源和汇，它们的惯性可以改变传播的动力学，特别是C型冲击波。冲击前气体和冲击波本身中颗粒的充电程度是一个重要参数。星际颗粒的数量从大分子（我们用多环芳烃表示）扩展到更大的颗粒（由硅酸盐和无定形碳材料组成）。详细模拟了颗粒惯性对流动动力学的影响，并建立了C型冲击波速度的上限。我们发现，带电和中性颗粒之间的碰撞，驱动的离子中性漂移的C型冲击波，可能会导致粉碎的大部分的无定形碳材料。
Gas–grain interactions can have important consequences for the physics and chemistry of shock waves propagating in molecular clouds. The grains can be both a source and a sink of molecules, and their inertia can modify the dynamics of the propagation of, in particular, C-type shock waves. The degree of charging of the grains, both in the pre-shock gas and in the shock wave itself, is a significant parameter. The population of interstellar grains extends from large molecules, which we represent by polycyclic aromatic hydrocarbons, to much larger particles, composed of silicates and amorphous carbon material. The influence of the inertia of the grains on the dynamics of the flow is modelled in detail, and upper limits to the velocities of C-type shock waves are established. We find that collisions between charged and neutral grains, driven by ion–neutral drift in C-type shock waves, may lead to the shattering of a large fraction of the amorphous carbon material.