论文标题
在暗物质光环的郊区
On the Outskirts of Dark Matter Haloes
论文作者
论文摘要
大规模结构的光环模型为对宇宙中物质聚类的现象学理解提供了强大而必不可少的工具。尽管光环模型是用光环的叠加来建立结构的，但在其郊区的光环概况（超越病毒半径）变得越来越模棱两可，因为人们无法以清晰的方式将物质分配给单个光晕。在本文中，我们通过使用数值n体模拟来解决该问题的系统定义，以发现可以扩展到大型半径的平均光晕曲线的系统定义。这些轮廓必须得到补偿，并且是修订后的光晕模型中宇宙相关函数计算的关键要素。后者是在我们较早的工作（ARXIV：1912.04872）中引入的，它对非线性结构形成的现象学描述更为准确，该形成尊重大规模的保护法。在这里，我们使用N体模拟将该模型从自动功率光谱扩展到Halo-Math-MATER跨功率光谱。我们发现（无量纲）补偿的晕圈配置文件，$ r^3 \ timesρ（r）/m_ {200c} $在小范围内的最大值$ 0.03-0.04 $ $ 0.03-0.04 $周围的病毒半径，$ r \ r \ r \ simeq r _ {\ rm 200c} $，独立于Halo Mass。在Halo郊区中，剖面将零变成负值，超过2-3 $ \ times r _ {\ rm 200c} $，与我们先前的结果一致。我们为补偿的Navarro-Frenk-White（NFW）配置文件提供初步拟合功能，这可用于计算大规模结构的修订后的Halo模型中更多的物理可观察物。
Halo Models of large scale structure provide powerful and indispensable tools for phenomenological understanding of the clustering of matter in the Universe. While the halo model builds structures out of the superposition of haloes, defining halo profiles in their outskirts - beyond their virial radii - becomes increasingly ambiguous, as one cannot assign matter to individual haloes in a clear way. In this paper, we tackle this question by using numerical N-body simulations to find a systematic definition of mean halo profile that can be extended to large radii. These profiles must be compensated and are the key ingredients for the computation of cosmological correlation functions in the Amended Halo Model. The latter, introduced in our earlier work (arXiv:1912.04872), provides a more physically accurate phenomenological description of nonlinear structure formation, which respects conservation laws on large scales. Here, we extend this model from the matter auto-power spectrum to the halo-matter cross-power spectra, using N-body simulations. We find that the (dimensionless) compensated halo profile, $r^3 \times ρ(r)/M_{200c}$ has a near-universal maximum in the small range $0.03-0.04$ around the virial radius, $r \simeq r_{\rm 200c}$, independent of the halo mass. The profiles cross zero into negative values in the halo outskirts, beyond 2-3$\times r_{\rm 200c}$, consistent with our previous results. We provide preliminary fitting functions for compensated Navarro-Frenk-White (NFW) profiles, and this can be used to compute more physical observables in the Amended Halo Model of large scale structure.
