Fine vertical structure of the galactic gaseous disk

被引：0
作者：
Yu. N. Mishurov
机构：
[1] South Federal University,
来源：
Astronomy Reports | 2007年 / 51卷
关键词：
98.35.Ce; 98.35.Hj; 98.35.Ln; 98.52.Nr; 98.58.Ay; 98.62.Dm; 98.62.Hr; 98.62.Lv;
D O I：
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学科分类号：
摘要：
The three-dimensional evolution of an ensemble of N particles (N = 8 × 105) in the external gravitational field of a galaxy perturbed by a spiral density wave is considered. The particles simulate clouds of interstellar gas, and inelastic two-body collisions between them are taken into account. The three-dimensional structure of the gaseous galactic layer and the vertical profile of the spiral arms are computed. It is shown that: (1) the local thickness of the gaseous galactic disk has a minimum where the volume gas density has a maximum (the maximum density of the interstellar medium is shifted downstream relative to the galactic shock front), (2) the configuration of the vertical profile of the spiral arms changes radically when the corotation region is crossed. Our first result explains the negative correlation between the thickness of the gas layer and the density derived from neutral-hydrogen observations. The second result can be used in the next generation of neutral-hydrogen observations to localize the corotation radius in the Galaxy.
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页码：215 / 221
页数：6
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