PMO OpenIR
Testing PSF Interpolation in Weak Lensing with Real Data
Lu, Tianhuan1; Zhang, Jun2; Dong, Fuyu2; Li, Yingke2; Liu, Dezi3; Fu, Liping4; Li, Guoliang5; Fan, Zuhui3
2017-04-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume153Issue:4Pages:13
Abstract

Reconstruction of the point-spread function (PSF) is a critical process in weak lensing measurement. We develop a real-data based and galaxy-oriented pipeline to compare the performances of various PSF reconstruction schemes. Making use of a large amount of the CFHTLenS data, the performances of three classes of interpolating schemes-polynomial, Kriging, and Shepard-are evaluated. We find that polynomial interpolations with optimal orders and domains perform the best. We quantify the effect of the residual PSF reconstruction error on shear recovery in terms of the multiplicative and additive biases, and their spatial correlations using the shear measurement method of Zhang et al. We find that the impact of PSF reconstruction uncertainty on the shear-shear correlation can be significantly reduced by cross correlating the shear estimators from different exposures. It takes only 0.2 stars (S/N greater than or similar to > 100) per square arcmin on each exposure to reach the best performance of PSF interpolation, a requirement that is satisfied in most of the CFHTlenS data.

Keywordgravitational lensing: weak large-scale structure of universe methods: data analysis techniques: image processing
DOI10.3847/1538-3881/aa661e
WOS KeywordPOINT-SPREAD FUNCTION ; GALAXY SHAPE MEASUREMENT ; COSMIC SHEAR ; IMAGING DATA ; FUNCTION ANISOTROPY ; CFHTLENS ; SPACE ; MODEL ; REDUCTION ; IMPACT
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000398408700002
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23178
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Jun
Affiliation1.Shanghai Jiao Tong Univ, Zhiyuan Coll, Shanghai 200240, Peoples R China
2.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China
3.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
4.Shanghai Normal Univ, Shanghai Key Lab Astrophys, Shanghai 200234, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210000, Peoples R China
Recommended Citation
GB/T 7714
Lu, Tianhuan,Zhang, Jun,Dong, Fuyu,et al. Testing PSF Interpolation in Weak Lensing with Real Data[J]. ASTRONOMICAL JOURNAL,2017,153(4):13.
APA Lu, Tianhuan.,Zhang, Jun.,Dong, Fuyu.,Li, Yingke.,Liu, Dezi.,...&Fan, Zuhui.(2017).Testing PSF Interpolation in Weak Lensing with Real Data.ASTRONOMICAL JOURNAL,153(4),13.
MLA Lu, Tianhuan,et al."Testing PSF Interpolation in Weak Lensing with Real Data".ASTRONOMICAL JOURNAL 153.4(2017):13.
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