用VANGCHIRaptor模拟寻找Galerkin和Halos
Hunting for Galaxies and Halos in simulations with VELOCIraptor
摘要：
我们介绍了VELOCIraptor，这是一种大规模平行星系/（亚）晕发现者，它还能够稳健地识别潮汐扰乱的物体并将恒星晕从星系中分离出来。代码是用C++11编写的，使用MPI和OpenMPAPI进行并行化，并包括Python工具来读取/操作生成的数据产品。我们展示了Venda Ciraptor（子）光环发现者的力量，展示了它如何识别宿主内部深处的subhalos，这些subhalos与其母晕的密度对比可以忽略不计。我们发现一个subhalo质量径向距离的依赖性：大型subhalos的质量比$\gtrsim10^{-2}$更常见的中心区域，较小的subhalos，动力摩擦和低潮汐质量损失率的结果。这种依赖性在通常使用的（子）晕寻找器中是完全不存在的，通常在配置空间中搜索子结构，但存在于跟踪属于晕的粒子落入其他晕（如HBT+）的代码中。VANGIOCIRAPTOR在很大程度上再现了没有跟踪的依赖性，从我们有限的分辨率基准模拟中发现了与HBT+相似的径向依赖性。
英文摘要：
We present VELOCIraptor, a massively parallel galaxy/(sub)halo finder that is also capable of robustly identifying tidally disrupted objects and separate stellar halos from galaxies. The code is written in c++11, use the MPI and OpenMP API's for parallelisation, and includes python tools to read/manipulate the data products produced. We demonstrate the power of the VELOCIraptor (sub)halo finder, showing how it can identify subhalos deep within the host that have negligible density contrasts to their parent halo. We find a subhalo mass-radial distance dependence: large subhalos with mass ratios of $\gtrsim10^{-2}$ are more common in the central regions that smaller subhalos, a result of dynamical friction and low tidal mass loss rates. This dependence is completely absent in (sub)halo finders in common use, which generally search for substructure in configuration space, yet is present in codes that track particles belonging to halos as they fall into other halos, such as HBT+. VELOCIraptor largely reproduces the dependence seen without tracking, finding a similar radial dependence to HBT+ in well resolved halos from our limited resolution fiducial simulation.
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