论文标题
暗物质光环的自然边界周围揭示了最小偏差和最大插入位置
A natural boundary of dark matter haloes revealed around the minimum bias and maximum infall locations
论文作者
论文摘要
我们通过它们的偏见和速度曲线来探索暗物质光环的边界。使用宇宙学$ n $体体模拟，我们表明偏置曲线表现出无处不在的槽，可以解释为Halo积聚产生的偏差，从而消耗了边界周围的材料。活动耗竭区域的内边缘以最大质量流入率的位置为标志，该位置将生长的光环与排水环境区分开。这种内部耗竭半径也可以解释为封闭高度完整的飞溅轨道群体的半径，并与大型结构的光环模型中的最佳排除半径匹配。偏置槽的最小值定义了一个特征耗尽半径，该半径位于内部耗竭半径和周转半径的界面区域内，同时在停止质量积聚的低质量光环中接近周转半径。特征耗竭半径最大于光晕质量和环境。大约是$ 2.5 $ $倍的病毒半径，并包含$ \ sim 40 $ $ \ sim的平均密度，$ \ sim 40 $倍的宇宙背景密度倍，独立于光晕质量，但取决于其他光晕特性。内部耗尽半径较小，$ 10-20 \％$，并将平均密度为$ \ sim 63 $乘以背景密度。这些半径为研究光环的特性打开了一个新窗口。
We explore the boundary of dark matter haloes through their bias and velocity profiles. Using cosmological $N$-body simulations, we show that the bias profile exhibits a ubiquitous trough that can be interpreted as created by halo accretion that depletes material around the boundary. The inner edge of the active depletion region is marked by the location of the maximum mass inflow rate that separates a growing halo from the draining environment. This inner depletion radius can also be interpreted as the radius enclosing a highly complete population of splashback orbits, and matches the optimal exclusion radius in a halo model of the large-scale structure. The minimum of the bias trough defines a characteristic depletion radius, which is located within the infall region bounded by the inner depletion radius and the turnaround radius, while approaching the turnaround radius in low mass haloes that have stopped mass accretion. The characteristic depletion radius depends the most on halo mass and environment. It is approximately $2.5$ times the virial radius and encloses an average density of $\sim 40$ times the background density of the universe, independent on halo mass but dependent on other halo properties. The inner depletion radius is smaller by $10-20\%$ and encloses an average density of $\sim 63$ times the background density. These radii open a new window for studying the properties of haloes.
