| 三轴椭圆星系形态与初始弥散速度分布 |
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| 引用本文： | 宋国玄,陈兴明.三轴椭圆星系形态与初始弥散速度分布[J].中国天文和天体物理学报,1990(3). |
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| 作者姓名： | 宋国玄 陈兴明 |
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| 作者单位： | 中国科学院上海天文台
(宋国玄)，中国科学院上海天文台(陈兴明) |
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| 摘 要： | 本文对具有初始几何形状及维里系数相同,但初始速度弥散度分布不同的三轴椭球进行了数值模拟。四个模型的最后质点分布及等密度轮廓的图象表明,三轴椭球的塌缩是与初始弥散速度的分布密切相关的。而不同的初始弥散速度分布可能与原星系在薄饼中不同的碎裂时刻有关。
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| 关 键 词： | 宇宙学 星系 椭圆星系 |
The Morphology of Triaxial Ellipticals and the Initial Distribution of Dispersion Velocities |
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| Song Guoxuan Chen Xingming.The Morphology of Triaxial Ellipticals and the Initial Distribution of Dispersion Velocities[J].Chinese Journal of Astronomy and Astrophysics,1990(3). |
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| Authors: | Song Guoxuan Chen Xingming |
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| Abstract: | In this paper, the configuration of triaxial ellipticals with different initial dispersion velocities is studied by numerical simulation. Four initial conditions are adopted:1. Uniform and isotropic distribution of dispersion velocities;2. Gaussian distribution in the magnitude of dispersion velocities;3. The magnitude of the dispersion velocities depends on the positions of particles as follows:4. Every x, y and z component of dispersion velocities is Gaussian.The initial configuration in 4 models and the initial virial ratio 2T/ | V | are the same.From Fig. 3 it is concluded that the final state configurations in the simulation are strongly dependent on the initial dispersion velocities, which might be due to the different epochs of protogalaxy fragmentation in the pancake. |
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| Keywords: | Cosmology-Galaxies-Ellipticals |
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