标题： 在存在前景的情况下确定宇宙微波背景各向异性 显示英文标题

标题： Determining cosmic microwave background anisotropies in the presence of foregrounds

摘要： 从信号中分离前景是宇宙微波背景（CMB）实验中的一个重大挑战。 估计给定像素中CMB温度的一种简单方法是对CMB和各种前景成分的振幅进行拟合。 该估计器的方差平方被证明等于$[(FDF)^2\ \sigzt + \sigsh^2]$，其中$\sigz$是不存在前景时的方差；$\sigsh$是由于前景成分形状的不确定性引起的方差；FDF是{\it 前景退化因子}。 这个单一的数字，FDF，很好地表明了给定实验分辨CMB与前景源的能力。 提出了一系列与实验规划和分析相关应用。 显示英文摘要

摘要： Separating foregrounds from the signal is one of the big challenges in cosmic microwave background (CMB) experiments. A simple way to estimate the CMB temperature in a given pixel is to fit for the amplitudes of the CMB and the various foreground components. The variance squared of this estimator is shown to be equal to $[(FDF)^2\ \sigzt + \sigsh^2]$, where $\sigz$ is the variance in the absence of foregrounds; $\sigsh$ is the variance due to the uncertainty in the shapes of the foreground components; and FDF is the {\it foreground degradation factor}. This one number, the FDF, gives a good indication of the ability of a given experiment to disentangle the CMB from foreground sources. A variety of applications relating to the planning and analyzing of experiments is presented.