对从微波各向异性中减去前景银河贡献的一些质疑
Some doubts on the validity of the foreground Galactic contribution subtraction from microwave anisotropies
摘要：
CMBR各向异性中的银河前景污染，特别是来自尘埃成分的污染，不容易与宇宙学或河外成分分离。在本文中，将提出一些怀疑的有效性的方法来消除银河系尘埃排放，以表明他们没有达到其目标。首先，我回顾了最近的参考书目的主题，并严格讨论前景减法的方法：互相关与模板，分析假设的光谱形状的银河组件，“最大熵方法”，“内部线性组合”，和“基于小波的高分辨率拟合的内部模板”。第二，利用WMAP资料分析了银河系的纬度依赖性。的频率依赖性与现有文献中的数据进行了讨论。结果是，所有减去银河污染的方法都是不准确的。在50-250 GHz范围内，银河系纬度相关性分析或各向异性的频率相关性限制了功率谱中的最大银河系贡献小于a ~10%（68%C。L.）的范围内。对于~1度标度，并且对于更大的标度可能更高。在CMBR各向异性中的大部分信号的起源不是银河系的。在任何情况下，银河系的减法都不足以精确到允许“精确的宇宙学”;其他污染源（河外，太阳系）也存在。
英文摘要：
The Galactic foreground contamination in CMBR anisotropies, especially from the dust component, is not easily separable from the cosmological or extragalactic component. In this paper, some doubts will be raised concerning the validity of the methods used to date to remove Galactic dust emission in order to show that none of them achieves its goal. First, I review the recent bibliography on the topic and discuss critically the methods of foreground subtraction: the cross-correlation with templates, analysis assuming the spectral shape of the Galactic components, the "maximum entropy method", "internal linear combination", and "wavelet-based high resolution fitting of internal templates". Second, I analyse the galactic latitude dependence from WMAP data. The frequency dependence is discussed with the data in the available literature. The result is that all methods of subtracting the Galactic contamination are inaccurate. The galactic latitude dependence analysis or the frequency dependence of the anisotropies in the range 50-250 GHz put a constraint on the maximum Galactic contribution in the power spectrum to be less than a ~10% (68% C. L.) for a ~1 degree scale, and possibly higher for larger scales. The origin of most of the signal in the CMBR anisotropies is not Galactic. In any case, the subtraction of the Galaxy is not accurate enough to allow a "precision Cosmology"; other sources of contamination (extragalactic, solar system) are also present.
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