Fast generation of weak lensing maps by the inverse-Gaussianization method

doi:10.1103/PhysRevD.94.083520

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	Fast generation of weak lensing maps by the inverse-Gaussianization method
	Yu, Yu 3; Zhang, Pengjie 1,2; Jing, Yipeng 1,2
刊名	PHYSICAL REVIEW D
	2016-10-20
卷号	94 期号:8
ISSN号	2470-0010
DOI	10.1103/PhysRevD.94.083520
英文摘要	To take full advantage of the unprecedented power of upcoming weak lensing surveys, understanding the noise, such as cosmic variance and geometry/mask effects, is as important as understanding the signal itself. Accurately quantifying the noise requires a large number of statistically independent mocks for a variety of cosmologies. This is impractical for weak lensing simulations, which are costly for simultaneous requirements of large box size (to cover a significant fraction of the past light cone) and high resolution (to robustly probe the small scale where most lensing signal resides). Therefore, fast mock generation methods are desired and are under intensive investigation. We propose a new fast weak lensing map generation method, named the inverse-Gaussianization method, based on the finding that a lensing convergence field can be Gaussianized to excellent accuracy by a local transformation [Y. Yu, P. Zhang, W. Lin, W. Cui, and J. N. Fry, Phys. Rev. D 84, 023523 (2011).]. Given a simulation, it enables us to produce as many as infinite statistically independent lensing maps as fast as producing the simulation initial conditions. The proposed method is tested against simulations for each tomography bin centered at lens redshift z similar to 0.5, 1, and 2, with various statistics. We find that the lensing maps generated by our method have reasonably accurate power spectra, bispectra, and power spectrum covariance matrix. Therefore, it will be useful for weak lensing surveys to generate realistic mocks. As an example of application, we measure the probability distribution function of the lensing power spectrum, from 16384 lensing maps produced by the inverse-Gaussianization method.
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000386174700004
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32741]
专题	中国科学院上海天文台
通讯作者	Yu, Yu; Zhang, Pengjie
作者单位	1.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Dept Phys & Astron, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Yu, Yu,Zhang, Pengjie,Jing, Yipeng. Fast generation of weak lensing maps by the inverse-Gaussianization method[J]. PHYSICAL REVIEW D,2016,94(8).
APA	Yu, Yu,Zhang, Pengjie,&Jing, Yipeng.(2016).Fast generation of weak lensing maps by the inverse-Gaussianization method.PHYSICAL REVIEW D,94(8).
MLA	Yu, Yu,et al."Fast generation of weak lensing maps by the inverse-Gaussianization method".PHYSICAL REVIEW D 94.8(2016).