暗晕的并合

发布时间：2018-06-22 19:02

本文选题：暗物质晕 + 暗晕-暗晕并合率　；参考：《天文学进展》2015年04期

【摘要】：系统介绍暗晕-暗晕并合在理论方面的形成与发展,并简要介绍了其在数值模拟检验(冷暗物质模型)及拟合方面的进展。暗晕-暗晕并合率问题可与星系-星系并合率联系,正确地定义暗晕-暗晕并合率很重要,影响并合率的因素却很多,从数值模拟所得到的拟合公式往往存在较大差异,这些差异主要来自于定义:对并合的定义(并合树的建立),对暗晕质量的定义以及并合暗晕前身质量比的定义。数值模拟输出的时间步长也会对此有所影响,此外暗晕并合率也与环境强烈相关。对这些因素所导致的差异做了简单比较。此外,对于暗晕并合率的统计可分为对不同红移处的拟合和对z=0时刻对其并合历史的拟合,其中后者对不同质量的暗晕往往能给出一个较统一的拟合公式。
[Abstract]:This paper introduces the formation and development of dark halo and dark halo and its integration in theory, and briefly introduces its progress in numerical simulation test (cold dark matter model) and fitting. The problem of dark halo and dark halo and coincidence rate can be connected with Galaxy Galaxy combined rate, and it is important to define the dark halo and coincidence rate correctly, and many factors affect the coincidence rate. There are great differences in the fitting formulas obtained by the numerical simulation. These differences mainly come from the definition of the definition of the coincidence (and the establishment of the tree), the definition of the dark halo quality and the definition of the mass ratio of the halo precursor. The time step of the numerical simulation will also affect this, and the dark halo and the coincidence rate are also strong with the environment. A simple comparison is made of the differences caused by these factors. In addition, the statistics of the dark halo and coincidence rate can be divided into the fitting of the different red shifts and the fitting of the z=0 time to the history. The latter can often give a more unified fitting formula for the dark halo of different mass.
【作者单位】：中国科学院上海天文台星系与宇宙学重点实验室;
【基金】：国家自然科学基金(10303004,10533030,10873028,10821302,10878001)
【分类号】：P159

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