Removing the Impact of Correlated PSF Uncertainties in Weak Lensing
Lu,Tianhuan1,2; Zhang,Jun1,3; Dong,Fuyu1; Li,Yingke1; Liu,Dezi4,5,6; Fu,Liping5; Li,Guoliang7,8; Fan,Zuhui6
Source PublicationThe Astrophysical Journal
AbstractAbstract Accurate reconstruction of the spatial distributions of the point-spread function (PSF) is crucial for high precision cosmic shear measurements. Nevertheless, current methods are not good at recovering the PSF fluctuations of high spatial frequencies. In general, the residual PSF fluctuations are spatially correlated, and therefore can significantly contaminate the correlation functions of the weak lensing signals. We propose a method to correct for this contamination statistically, without any assumptions on the PSF and galaxy morphologies or their spatial distribution. We demonstrate our idea with the data from the W2 field of CFHTLenS.
Keywordgravitational lensing: weak methods: data analysis techniques: image processing
WOS IDIOP:0004-637X-858-2-aabb50
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
2.Department of Physics, UC Santa Barbara, Santa Barbara, CA 93106, USA
3.Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, People's Republic of China
4.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People's Republic of China
5.The Shanghai Key Lab for Astrophysics, Shanghai Normal University, Shanghai 200234, People's Republic of China
6.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
7.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210000, People's Republic of China
8.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei, 230029, People's Republic of China
Recommended Citation
GB/T 7714
Lu,Tianhuan,Zhang,Jun,Dong,Fuyu,et al. Removing the Impact of Correlated PSF Uncertainties in Weak Lensing[J]. The Astrophysical Journal,2018,858(2).
APA Lu,Tianhuan.,Zhang,Jun.,Dong,Fuyu.,Li,Yingke.,Liu,Dezi.,...&Fan,Zuhui.(2018).Removing the Impact of Correlated PSF Uncertainties in Weak Lensing.The Astrophysical Journal,858(2).
MLA Lu,Tianhuan,et al."Removing the Impact of Correlated PSF Uncertainties in Weak Lensing".The Astrophysical Journal 858.2(2018).
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