项目名称: 暗晕模型在高阶成团分析上的应用扩展
项目编号: No.11303095
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 蒙克来
作者单位: 中国科学院紫金山天文台
项目金额: 25万元
中文摘要: 暗晕模型对暗物质和星系空间分布的理论预言主要适用于低阶统计量,对三点相关函数的预言与模拟还有较大偏离,在小尺度上还存在着很多的不足,这极大的限制了暗晕模型和三阶统计函数的应用。本项目一方面将利用一类可以被现有暗晕模型准确预言的三阶函数研究小尺度上星系成团性质,主要结合HOD/CLF模型建立起一个小尺度上星系成团的三阶统计模型,通过理论模型、模拟星系样本、实测星系样本的对比分析来探索小尺度上星系物质成团的物理机制;另一方面,将系统考察暗晕形状、暗晕内暗物质分布、子结构分布等作用以期改进完善现有暗晕模型。
中文关键词: 宇宙学;暗晕模型;相关函数;星系形成;
英文摘要: The lower order clustering of dark matter and galaxies can be well predicted by halo model, but there is discrepancy when applying halo model to higher order statistics ,for example the three point correlation function, especially on small scales. The goal of our project is twofold, the first is that within the framework of HOD/CLF to develop a model to bescribe clustering of matter and galaxy on three point statistics level, making use of some kind of third order statistical function we have developed. this third order function can be predicted by halo model. By comparing and analysing different results of theoretical model and galaxy simulation as well as galaxy survey catalogue, we can explore the physics of galaxy and matter clustering on small scales. On the other hand we will investigate non-spherical halo shape and halo substructure systematically to improve current halo model.
英文关键词: cosmology;halo model;correlation function;galaxy formation;