Toward a Bias-free Selection Criterion in Shear Measurement

Sample selection is a necessary preparation for weak lensing measurement. It is well-known that selection itself may introduce bias to the measured shear signal. Using image simulation and the Fourier_Quad shear measurement pipeline, we quantify the selection bias in various commonly used selection...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 908; no. 1; pp. 93 - 101
Main Authors Li, Hekun, Zhang, Jun, Liu, Dezi, Luo, Wentao, Zhang, Jiajun, Dong, Fuyu, Shen, Zhi, Wang, Haoran
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 01.02.2021
IOP Publishing
Subjects
Astronomical methods
Astronomy data analysis
Astrophysics
Bias
Criteria
Fourier transforms
Galaxies
Large-scale structure of the universe
Shear
Signal to noise ratio
Weak gravitational lensing
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Summary:Sample selection is a necessary preparation for weak lensing measurement. It is well-known that selection itself may introduce bias to the measured shear signal. Using image simulation and the Fourier_Quad shear measurement pipeline, we quantify the selection bias in various commonly used selection criteria (signal-to-noise ratio, magnitude, etc.). We propose a new selection criterion defined in the power spectrum of the galaxy image. This new selection criterion has a low selection bias, and it is particularly convenient for shear measurement pipelines based on Fourier transformation.
Bibliography:Galaxies and Cosmology
AAS24899
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abcda3