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arXiv 0804.1809astro-ph
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一种多分辨率弱透镜质量重建方法

A Multi-Resolution Weak Lensing Mass Reconstruction Method

H. Khiabanian, I. P. Dell'Antonio

摘要:

出于与常用的直接重建技术生产质量地图遇到的局限性,我们已经开发了一种多分辨率的最大似然重建方法,用于生产二维质量地图使用弱引力透镜数据。为了利用所有的剪切信息,我们采用了一个迭代反演方法与适当选择的正则化系数,它适合在每个星系的位置偏转潜力。通过在观测场的不同部分产生具有多种分辨率的质量图,我们可以通过提高失真较高的区域或背景星系密度过大的区域的分辨率来实现可比的信噪比水平。此外,我们能够更好地研究大质量星系团的子结构,其分辨率在观测场的其余部分是无法达到的。我们将我们的方法应用于模拟数据和深透镜调查获得的四平方度场。

英文摘要:

Motivated by the limitations encountered with the commonly used direct reconstruction techniques of producing mass maps, we have developed a multi-resolution maximum-likelihood reconstruction method for producing two dimensional mass maps using weak gravitational lensing data. To utilize all the shear information, we employ an iterative inverse method with a properly selected regularization coefficient which fits the deflection potential at the position of each galaxy. By producing mass maps with multiple resolutions in the different parts of the observed field, we can achieve a comparable level of signal to noise by increasing the resolution in regions of higher distortions or regions with an over-density of background galaxies. In addition, we are able to better study the sub-structure of the massive clusters at a resolution which is not attainable in the rest of the observed field. We apply our method to the simulated data and to a four square degree field obtained by the Deep Lens Survey.

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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