Unified Analysis of Structure Formations and Evolutions in the Deep Universe

宇宙深处结构形成与演化的统一分析

基本信息

批准号：
10640229
负责人：
GOUDA Naoteru
金额：
$ 1.47万
依托单位：
National Astronomical Observatory of Japan (1999-2000)Osaka University (1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640229/
关键词：
galaxy formations large scale structues in the universe self-gravitating many-body systems

项目摘要

1. We developed a semi-analytic model for resolving the problems of galaxy formations and got some interesting results using this semi-analytic model based on the hierarchical clustering. By using this model, we tried to clarify what physical processes, which have never been taken into account in the galaxy formation models, influence on galaxy formations and evolutions. Furthermore, we tried to constrain the cosmological models and some physical processes concerned in the galaxy formations, such as star formations. The detailed topics on the galaxy formations are shown below.(1) The effects of merging histories of proto-objects on the angular momentum distributions of the present-time dark matter haloes were clarified.(2) We investigated the effects of the UV background radiation on galaxy formations by using the semi-analytic model including the photoionization process and we clarified its effects on the galaxy formations.(3) We calculated the detection rate of cold gas in elliptical … More galaxies using the semi-analytic model of galaxy formation, and compared it with observations. Then we could constrain the star formation rates in the galaxy formations.(4) We clarified the physical origin of the color-magnitude relation of elliptical galaxies in clusters of galaxies in the hierarchical clustering scenario by using the semi-analytic model.(5) The galaxy number counts are analyzed by using the semi-analytic model based on the hierarchical clustering scenario. In this model, we introduced the selection effects due to the rapidly dimming surface brightness at high redshift and the absorption by intergalactic HI clouds and by internal dust, which are not considered in the previous analysis of galaxy counts.2. The relation between relaxation, the time scale of Lyapunov instabilities, and the Kolmogorov-Sinai time in a one-dimensional gravitating sheet is studied. We found that the relaxation time to the final thermal equilibrium differs from the inverse of the Lyapunov exponents and the Kolmogorov-Sinai time.3. We found the relation between the two-point spatial correlation function and the density profile of the dark matter halos in the strongly nonlinear regime. Less

1. 我们开发了一个半解析模型来解决星系形成的问题，并使用这个基于层次聚类的半解析模型得到了一些有趣的结果。此外，我们还尝试约束宇宙学模型和与星系形成相关的一些物理过程，例如恒星形成，有关星系形成的详细主题如下所示。 .(1) 的阐明了原天体合并历史对当前暗物质晕角动量分布的影响。(2)我们利用包括光电离过程的半解析模型研究了紫外背景辐射对星系形成的影响并阐明了它对星系形成的影响。(3)利用星系形成的半解析模型计算了椭圆星系中冷气体的探测率，并与观测结果进行了比较。约束星系形成中的恒星形成速率。(4)我们利用半解析模型阐明了层次聚类场景中星系团中椭圆星系颜色-星等关系的物理起源。(5)星系数使用基于层次聚类场景的半解析模型来分析计数。在该模型中，我们引入了由于高红移下表面亮度快速变暗以及星系间 HI 云和内部 HI 云的吸收而产生的选择效应。 2．研究了一维引力片中的弛豫时间、李亚普诺夫不稳定性的时间尺度和柯尔莫哥洛夫-西奈时间之间的关系。最终的热平衡与李亚普诺夫指数的倒数和柯尔莫哥洛夫-西奈时间不同。3．我们发现了两点空间相关函数与暗物质密度剖面的关系。强非线性区域中的光晕较少。