Effects of dynamical evolution on the distribution of substructures
Effects of dynamical evolution on the distribution of substructures
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动力学演化对子结构分布的影响
DOI：
10.1111/j.1365-2966.2005.09633.x
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发表时间：
2004
影响因子：
4.8
通讯作者：
Andrew J Benson
中科院分区：
文献类型：
--
作者：
J. Peñarrubia;Andrew J Benson
我们开发了一个半解析模型，确定暗物质晕轨道暗物质子结构的质量和位置的演变。我们将这个模型应用到银河系的情况。我们特别关注的质量损失，动态摩擦和子结构-子结构相互作用的影响，其中最后一个以前被忽略的子结构演化的分析模型。我们的半解析处理再现的空间分布的子结构和它们的质量函数，从最近的N体宇宙学计算的高等人。我们发现，如果考虑到质量损失，目前的分布的子结构几乎是不敏感的动力学摩擦和散射从其他子结构。实施这些现象导致在r 0.25 r vir的子结构的数量略有增加（0.5%），反映了轨道属性在下降，因此纯粹是由周围的主机晕暗物质环境，并没有显着改变动力学演化。
We develop a semi-analytical model that determines the evolution of the mass and position of dark matter substructures orbiting in dark matter haloes. We apply this model to the case of the Milky Way. We focus in particular on the effects of mass loss, dynamical friction and substructure-substructure interactions, the last of which has previously been ignored in analytic models of substructure evolution. Our semi-analytical treatment reproduces both the spatial distribution of substructures and their mass function as obtained from the most recent N-body cosmological calculations of Gao et al. We find that, if mass loss is taken into account, the present distribution of substructures is practically insensitive to dynamical friction and scatterings from other substructures. Implementing these phenomena leads to a slight increase (≃5 per cent) in the number of substructures at r 0.25r vir reflects the orbital properties at infall and is therefore purely determined by the dark matter environment around the host halo and has not been significantly altered by dynamical evolution.