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arXiv 1203.4429astro-ph.CO
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弱透镜巡天星系形状测量的快速经验方法

A fast empirical method for galaxy shape measurements in weak lensing surveys

M. Tewes, N. Cantale, F. Courbin, T. D. Kitching, G. Meylan

摘要:

本文介绍了一种简单而快速的方法来校正星系的椭圆度测量的仪器和大气点扩散函数(PSF)的失真,鉴于弱透镜剪切测量。该方法根据测量的形状参数对星系和相关的PSF进行分类,并通过查询由监督学习建立的大型查找表(LUT)来校正测量的星系椭圆。我们已经将这种新方法应用于GREAT 10图像分析挑战,并在本文中提出了一种改进的解决方案,该解决方案获得了Q = 104的竞争性品质因数,无需任何剪切功率谱去噪或训练。特别令人感兴趣的是该方法的效率,在普通CPU上每个星系的处理时间低于3毫秒。

英文摘要:

We describe a simple and fast method to correct ellipticity measurements of galaxies from the distortion by the instrumental and atmospheric point spread function (PSF), in view of weak lensing shear measurements. The method performs a classification of galaxies and associated PSFs according to measured shape parameters, and corrects the measured galaxy ellipticites by querying a large lookup table (LUT), built by supervised learning. We have applied this new method to the GREAT10 image analysis challenge, and present in this paper a refined solution that obtains the competitive quality factor of Q = 104, without any shear power spectrum denoising or training. Of particular interest is the efficiency of the method, with a processing time below 3 ms per galaxy on an ordinary CPU.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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