A mushroom-shaped structure from the impact of a cloud with the Galactic disk
A mushroom-shaped structure from the impact of a cloud with the Galactic disk
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云与银盘撞击形成的蘑菇状结构
DOI：
10.1051/0004-6361:20047141
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Basu
中科院分区：
文献类型：
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作者：
T. Kudoh;S. Basu
我们提出，银河蠕虫 GW 123.4−1.5 的蘑菇形结构是由云与银河气盘碰撞而形成的。流体动力学模拟显示，云穿过银河中面后会形成蘑菇状结构。蘑菇形结构的寿命相当于圆盘的动态时间尺度，~10 7 年。我们发现模拟中穿过蘑菇形结构帽的速度与观测值一致。模拟还预测了银河平面另一侧的结构，该结构是云穿过圆盘后由开尔文-亥姆霍兹不稳定性产生的。
We propose that the mushroom-shaped structure of the Galactic worm GW 123.4−1.5 is created by a cloud collision with the Galactic gas disk. A hydrodynamic simulation shows that a mushroom-shaped structure is created after the cloud crosses the Galactic midplane. The lifetime of the mushroom-shaped structure is of order the dynamical time scale of the disk, ∼10 7 years. We find that the velocities across the cap of the mushroom-shaped structure in the simulation are consistent with the observed values. The simulation also predicts a structure on the opposite side of the Galactic plane which is created by the Kelvin-Helmholtz instability after the cloud passes through the disk.