Projection Effects of Large-scale Structures on Weak-lensing Peak Abundances

Projection Effects of Large-scale Structures on Weak-lensing Peak Abundances
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大型结构对弱透镜峰丰度的投影效应

DOI:
10.3847/1538-4357/aab900
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发表时间:
2018-03
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Zuhui Fan
Zuhui Fan
中科院分区:
其他
文献类型:
--
作者:
Shuo Yuan;Xiangkun Liu;Chuzhong Pan;Qiao Wang;Zuhui Fan

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弱透镜 (WL) 图中的峰值主要源自单个巨大光晕的透镜效应。因此,它们的丰度与晕质量函数密切相关,因此是一个强大的宇宙学探测器。然而,除了单个巨大的光晕之外,沿视线的大规模结构(LSS)也会产生峰值信号。在本文中,我们通过光线追踪模拟研究了 LSS 投影效果。我们表明,对于当前具有较大形状噪声的调查,随机 LSS 效应占主导地位。然而,对于未来源星系具有中值红移 z med 〜 1 或更高的 WL 巡天来说,它们是显着的。对于从观测到的 WL 高峰值计数得出的宇宙学约束,如果没有正确考虑 LSS 效应,可能会出现严重偏差。我们扩展了 Fan 等人的模型。通过将 LSS 投影效应纳入理论考虑。通过与模拟结果的比较,我们证明了改进模型的良好性能及其在宇宙学研究中的适用性。
High peaks in weak lensing (WL) maps originate dominantly from the lensing effects of single massive halos. Their abundance is therefore closely related to the halo mass function and thus a powerful cosmological probe. However, besides individual massive halos, large-scale structures (LSS) along lines of sight also contribute to the peak signals. In this paper, with ray-tracing simulations, we investigate the LSS projection effects. We show that for current surveys with a large shape noise, the stochastic LSS effects are subdominant. For future WL surveys with source galaxies having a median redshift z med ˜ 1 or higher, however, they are significant. For the cosmological constraints derived from observed WL high-peak counts, severe biases can occur if the LSS effects are not taken into account properly. We extend the model of Fan et al. by incorporating the LSS projection effects into the theoretical considerations. By comparing with simulation results, we demonstrate the good performance of the improved model and its applicability in cosmological studies.
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