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
刊名	Astronomical Journal
	2022
卷号	164 期号:5 页码:8
ISSN号	0004-6256
DOI	10.3847/1538-3881/ac8ff9
英文摘要	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.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[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.