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Toward a Bias-free Selection Criterion in Shear Measurement.
- Source :
-
Astrophysical Journal . 2/10/2021, Vol. 908 Issue 1, p1-9. 9p. - Publication Year :
- 2021
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FOURIER transforms
*GALAXY spectra
*POWER spectra
*SIGNAL-to-noise ratio
*PIPELINES
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 908
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 148860020
- Full Text :
- https://doi.org/10.3847/1538-4357/abcda3