论文标题
CMB阴影：星际灭绝对宇宙微波背景极化和温度各向异性的影响
CMB Shadows: The Effect of Interstellar Extinction on Cosmic Microwave Background Polarization and Temperature Anisotropy
论文作者
论文摘要
我们评估了宇宙微波背景（CMB）和前景成分之间的降解，这是由于银河系构成物质忽略了CMB的单极成分引起的前景成分。由于粉尘成分，由CMB阴影引起的温度各向异性的幅度约为1英国。该值与即将进行的CMB实验探测非高斯研究所需的噪声水平相当。另外，由于灰尘而引起的CMB阴影引起的极化幅度与CMB B模式极化的RMS值相当，该值由原始引力波印在印象。我们表明，将单功能定律模型作为尘埃谱应用于观察到的多频数据引入了系统误差，该误差可与即将到来的CMB B模式极化实验相当或大于或大于所需的噪声水平。从亚毫升波段数据中推论灰尘发射的固有频谱可将系统误差降低到所需的噪声水平以下。但是，此方法需要灰尘温度测量，其准确性比几个百分之几的更好。我们得出的结论是，必须在未来的CMB任务中考虑由于粉尘而产生的CMB阴影，以实现其目标灵敏度。我们的结果对于检测原始CMB B模式极化将很重要，而张量与量表的幅度为r = 10^{ - 3}。
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 monopole component of the CMB by the galactic interstellar matter. The amplitude of the temperature anisotropy caused by the CMB shadow, due to dust components, is about 1 uK. 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 dust emission from the submillimeter waveband data reduces systematic error below the required noise level. However, this method requires dust temperature measurements with an accuracy of better than a few percent. We conclude that the CMB shadow due to dust must be considered in future CMB missions for achieving their targeted sensitivity. Our results will be important to detect the primordial CMB B-mode polarization, with the amplitude of the tensor-to-scalar ratio of r=10^{-3}.
