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

doi:10.3847/1538-4357/aab900

CORC > 国家天文台 > 中国科学院国家天文台

	Projection Effects of Large-scale Structures on Weak-lensing Peak Abundances
	Yuan,Shuo 1; Liu,Xiangkun 2; Pan,Chuzhong 1,3; Wang,Qiao 4; Fan,Zuhui 1
刊名	The Astrophysical Journal
	2018-04-23
卷号	857 期号:2
关键词	gravitational lensing: weak large-scale structure of universe
ISSN号	0004-637X
DOI	10.3847/1538-4357/aab900
英文摘要	Abstract 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 zmed?～?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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-857-2-AAB900
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35609]
专题	中国科学院国家天文台
作者单位	1.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China; yuanshuoastro@gmail.com, fanzuhui@pku.edu.cn 2.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People’s Republic of China 3.Center for High Energy Physics, Peking University, Beijing 100871, People’s Republic of China 4.Key Laboratory for Computational Astrophysics, The Partner Group of Max Planck Institute for Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
推荐引用方式 GB/T 7714	Yuan,Shuo,Liu,Xiangkun,Pan,Chuzhong,et al. Projection Effects of Large-scale Structures on Weak-lensing Peak Abundances[J]. The Astrophysical Journal,2018,857(2).
APA	Yuan,Shuo,Liu,Xiangkun,Pan,Chuzhong,Wang,Qiao,&Fan,Zuhui.(2018).Projection Effects of Large-scale Structures on Weak-lensing Peak Abundances.The Astrophysical Journal,857(2).
MLA	Yuan,Shuo,et al."Projection Effects of Large-scale Structures on Weak-lensing Peak Abundances".The Astrophysical Journal 857.2(2018).