Needatool：一个用于宇宙学数据处理的针状分析工具
Needatool: A Needlet Analysis Tool for Cosmological Data Processing
摘要：
介绍了NeedATool（Needlet Analysis Tool），一个基于Needlet的数据分析软件，Needlet是一种小波变换，它对球面上定义的场的分析有很强的作用。针已成功地应用于天体物理和宇宙学观测的处理，特别是用于宇宙微波背景（CMB）数据的分析。通常，这样的分析是在实空间以及在其对偶域，谐波之一。这两种空间各有优缺点：例如，在像素空间中更容易处理部分天空覆盖和实验噪声;在谐波域中，波束处理和与理论预测的比较更有效。然而，在过去的十年中，小波已经成为一个有用的工具，CMB数据分析，因为它们允许结合的两个空间的大部分优点，其主要原因之一是其尖锐的本地化。在本文中，我们概述了分析性能的针头和讨论的主要特点的数值代码，这应该是一个有价值的除了CMB分析师的工具箱。
英文摘要：
We introduce NeedATool (Needlet Analysis Tool), a software for data analysis based on needlets, a wavelet rendition which is powerful for the analysis of fields defined on a sphere. Needlets have been applied successfully to the treatment of astrophysical and cosmological observations, and in particular to the analysis of cosmic microwave background (CMB) data. Usually, such analyses are performed in real space as well as in its dual domain, the harmonic one. Both spaces have advantages and disadvantages: for example, in pixel space it is easier to deal with partial sky coverage and experimental noise; in harmonic domain, beam treatment and comparison with theoretical predictions are more effective. During the last decade, however, wavelets have emerged as a useful tool for CMB data analysis, since they allow to combine most of the advantages of the two spaces, one of the main reasons being their sharp localisation. In this paper, we outline the analytical properties of needlets and discuss the main features of the numerical code, which should be a valuable addition to the CMB analyst's toolbox.
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