论文标题
来自粒子动力学的光环的飞溅半径:iii。光环目录,合并树和主机 - 苏巴洛关系
The splashback radius of halos from particle dynamics: III. Halo catalogs, merger trees, and host-subhalo relations
论文作者
论文摘要
实际上,任何涉及暗物质光环的调查都取决于其半径,质量以及它们是否是subhalo的定义。光环边界最常定义为包括球形过度密度对比度(例如R200C,RVIR和R200M),但不同的阈值导致半径和质量的显着差异。最近有人认为,Splashback半径是一个更具身体动机(通常更大)的光环边界,增加了定义范围。通常很难评估特定选择的影响,因为大多数光环目录仅包含一个或几个定义,而且通常只有一组宿主 - 苏贝洛关系。为了减轻这个问题,我们介绍了14个lambdacdm和自相似宇宙的N体模拟的Halo目录和合并树。基于Rockstar目录,我们使用Sparta代码计算其他光环属性,并将其与原始目录重组。新的目录包含许多球形过度密度和溅射半径和质量的变体,并且最关键的是每个定义的宿主 - 巴洛关系。我们还提出了一种新的合并树格式,其中将数据存储为压缩的二维矩阵。我们对不同定义之间的关系进行基本测试,并为Splashback-Spherical密度连接提供了更新的模型。 Sparta代码以及我们的目录和合并树公开可用。
Virtually any investigation involving dark matter halos relies on a definition of their radius, mass, and of whether they are a subhalo. The halo boundary is most commonly defined to include a spherical overdensity contrast (such as R200c, Rvir, and R200m), but different thresholds lead to significant differences in radius and mass. The splashback radius has recently been suggested as a more physically motivated (and generally larger) halo boundary, adding to the range of definitions. It is often difficult to assess the impact of a particular choice because most halo catalogs contain only one or a few definitions and generally only one set of host-subhalo relations. To alleviate this issue, we present halo catalogs and merger trees for 14 N-body simulations of LambdaCDM and self-similar universes. Based on ROCKSTAR catalogs, we compute additional halo properties using the SPARTA code and recombine them with the original catalogs. The new catalogs contain numerous variants of spherical overdensity and splashback radii and masses and, most critically, host-subhalo relations for each definition. We also present a new merger tree format where the data is stored as a compressed, two-dimensional matrix. We perform basic tests of the relation between different definitions and present an updated model for the splashback-spherical overdensity connection. The SPARTA code, as well as our catalogs and merger trees, are publicly available.