Statistical properties of filaments in weak gravitational lensing
Statistical properties of filaments in weak gravitational lensing
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DOI：
10.1093/mnras/stu583
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发表时间：
2014-03
影响因子：
4.8
通讯作者：
Y. Higuchi;M. Oguri;M. Shirasaki
中科院分区：
文献类型：
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作者：
Y. Higuchi;M. Oguri;M. Shirasaki
我们通过大型宇宙学 $N$ 体模拟来研究连接星系团的细丝的弱透镜特性。我们从模拟中选择了 4639 个质量高于 $10^{14}h^{-1}\mathrm{M}_\odot$ 的光晕对，并通过光线追踪模拟研究两个光晕之间的暗物质分布。为了对候选细丝进行分类，我们估计收敛曲线并执行曲线拟合。我们发现晕之间的物质分布可以在拟合参数平面中进行分类，这使我们能够从射线追踪模拟中选择直丝。我们还研究了这些细丝的统计特性，发现它们与之前的研究一致。我们发现 $35\%$ 的光晕对拥有直丝，其中 $4\%$ 可以通过弱透镜直接在 $S/N\geq2$ 处检测到。此外，我们研究了细丝边缘光晕的统计特性。我们发现光晕优先沿着丝状结构拉长，并且随着丝状质量的增加而质量减小。然而，这些光晕特性对直丝质量的依赖性非常弱。
We study weak lensing properties of filaments that connect clusters of galaxies through large cosmological $N$-body simulations. We select 4639 halo pairs with masses higher than $10^{14}h^{-1}\mathrm{M}_\odot$ from the simulations and investigate dark matter distributions between two haloes with ray-tracing simulations. In order to classify filament candidates, we estimate convergence profiles and perform profile fitting. We find that matter distributions between haloes can be classified in a plane of fitting parameters, which allow us to select straight filaments from the ray-tracing simulations. We also investigate statistical properties of these filaments, finding them to be consistent with previous studies. We find that $35\%$ of halo pairs possess straight filaments, $4\%$ of which can directly be detected at $S/N\geq2$ with weak lensing. Furthermore, we study statistical properties of haloes at the edges of filaments. We find that haloes are preferentially elongated along filamentary structures and are less massive with increasing filament masses. However, the dependence of these halo properties on masses of straight filaments is very weak.