对N体数值模拟中暗物质晕的卫星星系空间分布的研究
发布时间：2019-01-03 07:32
【摘要】：对N体数值模拟中暗物质晕的卫星星系的空间分布进行三轴椭球拟合,以拟合椭球的轴比来衡量该分布的扁平程度,通过比较不同条件下的轴比分布分析样本数量、样本选取方式以及对样本径向分布的归一化对计算结果的影响,并考察了暗晕所在的大尺度结构的空间方向与拟合椭球的空间取向之间的关系.发现对样本径向分布的归一化对计算结果具有较大影响,同时发现大尺度丝状结构中的暗晕的拟合椭球的短轴更趋于与丝状结构的方向垂直,而大尺度片状结构中的暗晕的拟合椭球的短轴则更趋于与片状结构的法线方向平行.
[Abstract]:The spatial distribution of satellite galaxies with dark matter halos in N body numerical simulation is fitted with a triaxial ellipsoid. The flat degree of the distribution is measured by fitting the axial ratio of the ellipsoid. The number of samples is analyzed by comparing the axial ratio distribution under different conditions. The influence of sample selection mode and the normalization of the radial distribution of the sample on the calculation results is also investigated. The relationship between the spatial direction of the large scale structure of the dark halo and the spatial orientation of the fitting ellipsoid is investigated. It is found that the normalization of the radial distribution of the sample has a great influence on the calculation results, and it is also found that the short axis of the fitting ellipsoid of the dark halo in the large scale filamentous structure tends to be perpendicular to the direction of the filamentous structure. However, the short axis of the fitting ellipsoid of the dark halo in the large scale flake structure tends to be parallel to the normal direction of the lamellar structure.
【作者单位】： 中国科学院紫金山天文台;中国科学院大学;
【基金】：江苏省杰出青年科学基金项目(BK20140050) 科技部973项目(2015CM857003,2013CB834900) 国家自然科学基金项目(11333008,11173056) 中国科学院B类先导项目(XDB09010403)资助
【分类号】：P145.9
[Abstract]:The spatial distribution of satellite galaxies with dark matter halos in N body numerical simulation is fitted with a triaxial ellipsoid. The flat degree of the distribution is measured by fitting the axial ratio of the ellipsoid. The number of samples is analyzed by comparing the axial ratio distribution under different conditions. The influence of sample selection mode and the normalization of the radial distribution of the sample on the calculation results is also investigated. The relationship between the spatial direction of the large scale structure of the dark halo and the spatial orientation of the fitting ellipsoid is investigated. It is found that the normalization of the radial distribution of the sample has a great influence on the calculation results, and it is also found that the short axis of the fitting ellipsoid of the dark halo in the large scale filamentous structure tends to be perpendicular to the direction of the filamentous structure. However, the short axis of the fitting ellipsoid of the dark halo in the large scale flake structure tends to be parallel to the normal direction of the lamellar structure.
【作者单位】： 中国科学院紫金山天文台;中国科学院大学;
【基金】：江苏省杰出青年科学基金项目(BK20140050) 科技部973项目(2015CM857003,2013CB834900) 国家自然科学基金项目(11333008,11173056) 中国科学院B类先导项目(XDB09010403)资助
【分类号】：P145.9
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