论文标题
球形塌陷模型中的飞溅半径
Splashback radius in a spherical collapse model
论文作者
论文摘要
几年前,暗物质光环郊区的特征是非常陡峭的径向范围非常陡峭。该特征已被解释为在不同粒子轨道的类似位置的堆积,即倒塌后半轨道的飞溅材料。 Adhikari等。 (2014年),通过一个非常简单的模型获得了飞溅半径的位置,即在次级输入模型中计算出暗物质壳的轨迹,同时它越过增长的NFW轮廓形状形状,暗物质光环。由于他们强加了光晕曲线,而不是从暗物质壳的轨迹中计算出来,因此他们无法在飞溅半径周围找到暗物质剖面。在本文中,我们使用改进的球形内部模型进入壳交叉,以及几种物理效应,如有序和随机的角动量,动力学摩擦,绝热收缩等。这使我们能够确定从内部到外部区域的密度谱,并研究外部密度谱的行为。我们将比较密度曲线和密度曲线的对数斜率与Diemer \&Kravtsov(2014)模拟的结果,在模型的预测和模拟之间找到了良好的一致性。
It has been shown some years ago that dark matter haloes outskirts are characterized by very steep density profiles in a very small radial range. This feature has been interpreted as a pile up of at a similar location of different particle orbits, namely splashback material at half an orbit after collapse. Adhikari et al. (2014), obtained the location of the splashback radius through a very simple model, namely calculating a dark matter shell trajectory in the secondary infall model while it crosses a growing, NFW profile shaped, dark matter halo. Since they imposed a halo profile instead of calculating it from the trajectories of the shells of dark matter, they were not able to find the dark matter profile around the splashback radius. In the present paper, we use an improved spherical infall model taking into shell crossing, and several physical effects like ordered, and random angular momentum, dynamical friction, adiabatic contraction, etc. This allow us to determine the density profile from the inner to outer region, and study the behavior of the outer density profile. We will compare the density profiles, and the logarithmic slope of the density profile with the results of Diemer \& Kravtsov (2014) simulations, finding a good agreement between the prediction of the model and the simulations.