Tolerance For the Pixelation Effect in Shear Measurement

doi:10.3847/1538-3881/ac8ff9

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	Tolerance For the Pixelation Effect in Shear Measurement
	Z. Shen; J. Zhang; H. K. Li; H. R. Wang; C. L. Wei; G. L. Li; X. B. Li; Z. Ban and D. Yue
	2022
发表期刊	Astronomical Journal
ISSN	0004-6256
卷号	164 期号:5 页码:8
摘要	Images taken by space telescopes typically have a superb spatial resolution, but a relatively poor sampling rate due to the finite CCD pixel size. Beyond the Nyquist limit, it becomes uncertain how much the pixelation effect may affect the accuracy of galaxy shape measurement. It is timely to study this issue given that a number of space-based large-scale weak lensing surveys are planned. Using the Fourier_Quad method, we quantify the shear recovery error as a function of the sampling factor Q, i.e., the ratio between the FWHM of the point-spread function (PSF) and the pixel size of the CCD, for different PSFs and galaxies of different sizes and noise levels. We show that sub-percent-level accuracy in shear recovery is achievable with single-exposure images for Q less than or similar to 2. The conclusion holds for galaxies much smaller than the PSF, and those with a significant level of noise.
DOI	10.3847/1538-3881/ac8ff9
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收录类别	sci ; ei
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67178
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Z. Shen,J. Zhang,H. K. Li,et al. Tolerance For the Pixelation Effect in Shear Measurement[J]. Astronomical Journal,2022,164(5):8.
APA	Z. Shen.,J. Zhang.,H. K. Li.,H. R. Wang.,C. L. Wei.,...&Z. Ban and D. Yue.(2022).Tolerance For the Pixelation Effect in Shear Measurement.Astronomical Journal,164(5),8.
MLA	Z. Shen,et al."Tolerance For the Pixelation Effect in Shear Measurement".Astronomical Journal 164.5(2022):8.

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