Large-scale polarization of the microwave background and foreground
Large-scale polarization of the microwave background and foreground
复制标题
微波背景和前景的大尺度偏振
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Smoot
中科院分区：
文献类型：
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作者：
A. D. Oliveira;Max Tegmark;C. O’Dell;B. Keating;P. Timbie;G. Efstathiou;G. Smoot
DASI对宇宙微波背景（CMB）极化的发现揭开了宇宙学的新篇章。关于暴胀引力波和再电离的大多数有用信息都是在大的角尺度上，在那里银河前景污染是最严重的，所以一个关键的挑战是建模，量化和消除偏振前景。我们使用的POLAR实验，COBE/DMR和无线电调查，以提供最强的限制到目前为止的TE交叉功率谱的CMB大角度尺度和量化的偏振同步辐射，这可能是最具挑战性的偏振污染物的WMAP卫星。我们发现，同步加速器E和B的贡献是等于在10%以内，从408-820 MHz的提示E统治在更高的频率。我们量化了二维（l，v）平面中的法拉第旋转和退偏振效应，并表明它们导致同步加速器偏振百分比向低频和低多极下降。
The DASI discovery of cosmic microwave background (CMB) polarization has opened a new chapter in cosmology. Most of the useful information about inflationary gravitational waves and reionization is on large angular scales where galactic foreground contamination is the worst, so a key challenge is to model, quantify, and remove polarized foregrounds. We use the POLAR experiment, COBE/DMR and radio surveys to provide the strongest limits to date on the TE cross-power spectrum of the CMB on large angular scales and to quantify the polarized synchrotron radiation, which is likely to be the most challenging polarized contaminant for the WMAP satellite. We find that the synchrotron E and B contributions are equal to within 10% from 408–820 MHz with a hint of E domination at higher frequencies. We quantify Faraday rotation and depolarization effects in the two-dimensional (l,ν) plane and show that they cause the synchrotron polarization percentage to drop both towards lower frequencies and towards lower multipoles.