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Toward a Bias-free Selection Criterion in Shear Measurement

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Title
Toward a Bias-free Selection Criterion in Shear Measurement
Author(s)
Hekun Li; Jun Zhang; Dezi Liu; Wentao Luo; Jiajun Zhang; Fuyu Dong; Zhi Shen; Haoran Wang
Publication Date
2021-02
Journal
ASTROPHYSICAL JOURNAL, v.908, no.1, pp.1 - 9
Publisher
IOP PUBLISHING LTD
Abstract
© 2021. The American Astronomical Society 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.
URI
https://pr.ibs.re.kr/handle/8788114/9539
DOI
10.3847/1538-4357/abcda3
ISSN
0004-637X
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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