Can one reconstruct the masked cosmic microwave background sky
Can one reconstruct the masked cosmic microwave background sky
复制标题
能否重建被遮蔽的宇宙微波背景天空
DOI：
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复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Lustig
中科院分区：
文献类型：
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作者：
R. Aurich;S. Lustig
通过观测获得的宇宙微波背景（CMB）图总是具有域，由于真实的 CMB 信号存在严重的不确定性，这些域必须被掩盖。宇宙学分析最好使用完整的宇宙微波背景图，以获得角功率谱等。在进行进一步分析之前，人们尝试至少以低分辨率（即大角度尺度）重建遮蔽区域。在本文中，研究了 ILC（7 年）图以及 Λ 冷暗物质一致性模型的 1000 个 CMB 模拟的重建质量。后者允许对重建算法进行误差估计，这揭示了一些缺点。分析指出 CMB 平均温度波动的很大一部分的误差。针对不同的重建天空图评估了温度两点相关函数 C(ϑ)，得出的结论是在剪切天空上计算它是最安全的。
The cosmic microwave background (CMB) maps obtained by observations always possess domains, which have to be masked due to severe uncertainties with respect to the genuine CMB signal. Cosmological analyses ideally use full CMB maps in order to get, for example, the angular power spectrum. There are attempts to reconstruct the masked regions at least at low resolutions, that is, at large angular scales, before a further analysis follows. In this paper, the quality of the reconstruction is investigated for the ILC (7-yr) map as well as for 1000 CMB simulations of the Λ cold dark matter concordance model. The latter allows an error estimation for the reconstruction algorithm, which reveals some drawbacks. The analysis points to errors of the order of a significant fraction of the mean temperature fluctuation of the CMB. The temperature two-point correlation function C(ϑ) is evaluated for different reconstructed sky maps, which leads to the conclusion that it is safest to compute it on the cut-sky.
影响因子：
5
作者：
Pontzen A
通讯作者：
Pontzen A