论文标题
关于南部孔中星光的两极分化的知识
What is Known About the Polarization of Starlight in the Southern Hole
论文作者
论文摘要
宇宙学中最大的奥秘之一是统一问题，涉及宇宙缺乏曲率以及同质性问题，质疑尽管区域有因果关系而脱节的地区，为什么宇宙几乎是各向同性的。这些问题是通货膨胀理论的动机，这表明早期宇宙中的指数扩展时期，宇宙的通货膨胀起源可以通过B模式极化来追溯。 In an effort to better understand the potential foreground systematics, especially the levels of polarized dust emission, we queried the Heiles catalog to produce a list of starlight polarization data in the so-called "Southern Hole", which is an approximately $20\times20$ degree region centered at RA: $00^h12^m00^s$ and DEC: $-59°18'00''$ that is being examined by multiple CMB polarization experiments.由于磁场倾向于决定尘埃晶粒的方向，这反过来决定了星光如何极化，因此可以使用星光极化来追踪磁场。因此，为了提高我们对该区域的特性的理解，我们将该目录以及Gaia数据以及灰尘分布的示踪剂以及南部孔区域整个银河系的磁场方向的潜在指标进行了使用。然后，我们分析了这些数据，希望可以使用磁场数据来创建模板，以帮助减去通过极化灰尘发射对CMB B模式搜索的污染。尽管分析的结果是有希望的，但我们发现目前可用的数据严重不足以创建模板，从而证明了在极化测量方面对南部孔的改进和更均匀的覆盖范围的需求。
Among the greatest mysteries in cosmology are the flatness problem, concerning the lack of curvature of the universe, and the homogeneity problem, questioning why the universe is almost isotropic despite having regions that are causally disconnected. These problems served as motivation for the theory of inflation, which suggests a period of exponential expansion in the early universe, and the inflationary origin of the universe can be traced by B-mode polarization. In an effort to better understand the potential foreground systematics, especially the levels of polarized dust emission, we queried the Heiles catalog to produce a list of starlight polarization data in the so-called "Southern Hole", which is an approximately $20\times20$ degree region centered at RA: $00^h12^m00^s$ and DEC: $-59°18'00''$ that is being examined by multiple CMB polarization experiments. Because magnetic field tends to dictate the orientation of dust grains, which in turn determines how starlight is polarized, starlight polarization can be used to trace magnetic fields. Therefore, to improve our understanding of the properties of this region, we used this catalog, along with Gaia data as tracers of the three-dimensional distribution of dust, as a potential indicator of magnetic field orientation throughout the galaxy in the Southern Hole region. We then analyzed these data with the hope that magnetic field data can be used to create a template to aid in subtracting away the contamination of CMB B-mode searches by polarized dust emission. While the results of the analysis are promising, we found that the currently available data are severely inadequate for the purpose of creating a template, thus demonstrating the need for improved and more uniform coverage of the Southern Hole when it comes to polarization measurements.
