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arXiv astro-ph/9806387astro-ph
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卫星观测宇宙微波背景的前景分离方法

Foreground separation methods for satellite observations of the cosmic microwave background

MP Hobson, AW Jones, AN Lasenby, FR Bouchet

摘要:

本文提出了一种分离宇宙微波背景辐射(CMBR)模拟卫星观测中不同前景成分辐射的最大熵方法。特别是,该方法适用于模拟观测拟议的普朗克测量卫星。Bouchet和Gispert(1998)进行的模拟包括来自CMBR的发射、来自星系团的动力学和热Sunyaev-Zel'dovich(SZ)效应、以及银河尘埃、自由-自由和同步辐射。我们发现,MEM技术表现良好,并产生忠实的重建的主要输入组件。该方法还与传统的维纳滤波相比,并示出产生一致的更好的结果,特别是在恢复的热SZ效应。

英文摘要:

A maximum entropy method (MEM) is presented for separating the emission due to different foreground components from simulated satellite observations of the cosmic microwave background radiation (CMBR). In particular, the method is applied to simulated observations by the proposed Planck Surveyor satellite. The simulations, performed by Bouchet and Gispert (1998), include emission from the CMBR, the kinetic and thermal Sunyaev-Zel'dovich (SZ) effects from galaxy clusters, as well as Galactic dust, free-free and synchrotron emission. We find that the MEM technique performs well and produces faithful reconstructions of the main input components. The method is also compared with traditional Wiener filtering and is shown to produce consistently better results, particularly in the recovery of the thermal SZ effect.

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