We evaluate the degradation of the accuracy of the component separation between the cosmic microwave background (CMB) and foreground components caused by neglect of absorption of the CMB’s monopole component by the galactic interstellar matter. The amplitude of the temperature anisotropy caused by the CMB shadow, due to dust components, is about 1 μ K. This value is comparable to the required noise level necessary to probe non-Gaussianity studies with upcoming CMB experiments. In addition, the amplitude of the polarization caused by the CMB shadow due to dust is comparable to or larger than the rms value of the CMB B -mode polarization, imprinted by primordial gravitational waves. We show that applying a single-power-law model as the dust spectrum to observed multifrequency data introduces systematic errors, which are comparable to or larger than the required noise level for forthcoming CMB B -mode polarization experiments. Deducing the intrinsic spectrum of du...

中文翻译：

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CMB阴影：星际消光对宇宙微波背景极化和温度各向异性的影响

我们评估了星系星际物质对CMB单极子分量的吸收而导致的宇宙微波背景（CMB）与前景分量之间的分量分离精度的下降。由于灰尘成分，由CMB阴影引起的温度各向异性的幅度约为1μK。该值可与为即将进行的CMB实验进行非高斯性研究所需的噪声水平相当。此外，由灰尘引起的CMB阴影引起的极化幅度可与原始重力波印记的CMB B模式极化的均方根值相当或更大。我们表明，将单幂律模型作为尘埃谱应用于观测的多频数据会引入系统误差，与即将到来的CMB B模式极化实验所需的噪声水平相当或更高。推算du ...