An Origin of Supersonic Motions in Interstellar Clouds
An Origin of Supersonic Motions in Interstellar Clouds
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DOI：
10.1086/338978
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发表时间：
2001-01
期刊：
影响因子：
--
通讯作者：
H. Koyama;S. Inutsuka
中科院分区：
文献类型：
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作者：
H. Koyama;S. Inutsuka
通过二维流体力学数值计算，研究了激波在星际介质中的传播，包括冷却、加热和热传导。我们提出的高分辨率，二维计算的结果，遵循的破碎，在冲击压缩层的热不稳定性的结果。我们发现，几何薄的冷却层后面的冲击波前锋的碎片成小的云。在温暖的中性介质中，小云团具有超音速弥散，其中碎片以冷凝结的形式嵌入。碎片往往会合并成更大的云。
The propagation of a shock wave into an interstellar medium is investigated by two-dimensional numerical hydrodynamic calculation with cooling, heating, and thermal conduction. We present results of the high-resolution, two-dimensional calculations to follow the fragmentation that results from thermal instability in a shock-compressed layer. We find that the geometrically thin cooling layer behind the shock front fragments into small cloudlets. The cloudlets have supersonic velocity dispersion in the warm neutral medium, in which the fragments are embedded as cold condensations. The fragments tend to coalesce and become larger clouds.