用EBHIS和普朗克资料模拟北银河系帽上方大尺度的尘埃极化
Dust polarization modeling at large-scale over the Northern Galactic cap using EBHIS and Planck data
摘要：
在探索由原始引力波引入的宇宙微波背景（CMB）的B模偏振过程中，系统不确定性的主要来源是来自银河尘埃的偏振热辐射。因此，在区分这样一个微弱的CMB B模式信号的偏振热尘埃发射的准确表征和分离是一个必不可少的步骤。我们提供了一个建模框架来模拟基于Ghosh等人（2017）中描述的模型的极化热尘埃排放，利用普朗克尘埃和Effelsberg-Bonn HI对北银河系帽的调查。我们的七参数尘埃模型，将HI气体在三个不同的柱密度模板作为空间可变的尘埃强度和银河系磁场的现象学模型的代理，是能够再现1-和2-点的统计数据所观察到的尘埃极化图普朗克在353 GHz的选定的低柱密度区域在北银河系帽。这项工作具有重要的应用，在评估组件分离方法的准确性和量化的置信度分离偏振银河系发射和CMB B模式信号，因为需要为正在进行的和未来的CMB任务。
英文摘要：
The primary source of systematic uncertainty in the quest for the B-mode polarization of the Cosmic Microwave Background (CMB) introduced by primordial gravitational waves is polarized thermal emission from Galactic dust. Therefore, accurate characterization and separation of the polarized thermal dust emission is an essential step in distinguishing such a faint CMB B-mode signal. We provide a modelling framework to simulate polarized thermal dust emission based on the model described in Ghosh et al. (2017), making use of both the Planck dust and Effelsberg-Bonn HI surveys over the northern Galactic cap. Our seven-parameter dust model, incorporating both HI gas in three different column density templates as a proxy for spatially variable dust intensity and a phenomenological model of Galactic magnetic field, is able to reproduce both 1- and 2-point statistics of the observed dust polarization maps seen by Planck at 353 GHz over a selected low-column density region in the northern Galactic cap. This work has important applications in assessing the accuracy of component separation methods and in quantifying the confidence level of separating polarized Galactic emission and the CMB B-mode signal, as is needed for ongoing and future CMB missions.
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