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A High-Accuracy Method for the Removal of Point Sources from Maps of the Cosmic Microwave Background

机译:一种从宇宙微波背景图去除点源的高精度方法

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摘要

A new method for removing point radio sources and other non-Gaussian noise is proposed as a means of improving the accuracy of estimates of the angular power spectrum of the cosmic microwave background (CMB). The main idea of the method is to reconstruct fluctuations of the CMB in places contaminated by such emission, while traditional methods simply exclude these regions from consideration, leading to the appearance of "holes" in the resulting maps. The fundamental possibility of reconstructing the CMB signal in such holes follows from the analytical properties of a function with a finite spatial spectrum (the Silk damping frequency). A two-dimensional median filter is used to localize the point radio sources. Results of simulations of the method for maps of modest size are presented. The efficiency of applying the method to reconstruct the CMB from data with limited resolution and contaminated by appreciable pixel noise is investigated. The fundamental possibility of applying the method to reconstruct the CMB distribution in the region of the Galaxy is also demonstrated.
机译:提出了一种消除点无线电源和其他非高斯噪声的新方法,作为提高宇宙微波背景(CMB)角功率谱估计精度的一种手段。该方法的主要思想是在受此类排放污染的地方重建CMB的波动,而传统方法只是将这些区域排除在考虑范围之外,从而导致生成的地图中出现“孔”。在这样的孔中重建CMB信​​号的基本可能性来自具有有限空间频谱(Silk阻尼频率)的函数的解析特性。二维中值滤波器用于定位点无线电源。给出了适度大小的地图方法的仿真结果。研究了应用该方法从分辨率有限且受可观像素噪声污染的数据中重构CMB的效率。还展示了应用该方法重建银河地区CMB分布的基本可能性。

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  • 作者

    Bajkova, A T;

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  • 年度 2005
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  • 原文格式 PDF
  • 正文语种 eng
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