arXiv 1606.045622016-06astro-ph.COastro-ph.GA

晕旋与z=3时宇宙网丝的关系

Relation between halo spin and cosmic web filaments at z=3

Roberto E. Gonzalez, Joaquin Prieto, Nelson Padilla, Raul Jimenez

备注：: 8 pages, 9 figures. Accepted for publication in MNRAS
发表信息：: Monthly Notices of the Royal Astronomical Society, Volume 464, Issue 4, p.4666-4672 (2017)
DOI：: 10.1093/mnras/stw2715

摘要：

我们研究了暗物质晕的自旋演化及其对高红移宇宙网中连接细丝数量的依赖性（下文称为自旋-细丝关系）。为此，我们在宇宙学N体模拟中模拟了质量范围为$5\times10^{9}h^{-1}M_{\odot}$到$5\times10^{11}h^{-1}M_{\odot}$的$5000$晕，其质量范围为$z=3$。我们证实了Prieto等人在2015年发现的关系，其中具有较少细丝的晕具有较大的自旋。我们还发现，这种关系是更重要的晕质量较高，和晕与被动（没有重大合并）的组装历史。另一个发现是，具有较大自旋或较少细丝的晕具有与自旋矢量更垂直对齐的细丝。我们的研究结果指向一个图片中的初始自旋的晕是很好地描述了潮汐扭矩理论，然后得到随后的修改，在一个可预测的方式，因为拓扑结构的宇宙网络，这反过来又是由目前青睐的LCDM模型。我们的自旋-细丝关系是LCDM的一个预测，可以用观测来检验。

英文摘要：

We investigate the spin evolution of dark matter haloes and their dependence on the number of connected filaments from the cosmic web at high redshift (spin-filament relation hereafter). To this purpose, we have simulated $5000$ haloes in the mass range $5\times10^{9}h^{-1}M_{\odot}$ to $5\times10^{11}h^{-1}M_{\odot}$ at $z=3$ in cosmological N-body simulations. We confirm the relation found by Prieto et al. 2015 where haloes with fewer filaments have larger spin. We also found that this relation is more significant for higher halo masses, and for haloes with a passive (no major mergers) assembly history. Another finding is that haloes with larger spin or with fewer filaments have their filaments more perpendicularly aligned with the spin vector. Our results point to a picture in which the initial spin of haloes is well described by tidal torque theory and then gets subsequently modified in a predictable way because of the topology of the cosmic web, which in turn is given by the currently favoured LCDM model. Our spin-filament relation is a prediction from LCDM that could be tested with observations.

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英文摘要：

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