Title: A new probe of line-of-sight magnetic field tangling Show Chinese title

Title: 一个新的视线方向磁场缠绕探针

Abstract: The Galactic neutral hydrogen (HI) sky at high Galactic latitudes is suffused with linear structure. Particularly prominent in narrow spectral intervals, these linear HI features are well aligned with the plane-of-sky magnetic field orientation as measured with optical starlight polarization and polarized thermal dust emission. We analyze the coherence of the orientation of these features with respect to line-of-sight velocity, and propose a new metric to quantify this HI coherence. We show that HI coherence is linearly correlated with the polarization fraction of 353 GHz dust emission. HI coherence constitutes a novel method for measuring the degree of magnetic field tangling along the line of sight in the diffuse interstellar medium. We propose applications of this property for HI-based models of the polarized dust emission in diffuse regions, and for studies of frequency decorrelation in the polarized dust foreground to the cosmic microwave background (CMB). Show Chinese abstract

Abstract: 高银纬的银河系中性氢（HI）天区充满了线状结构。 这些线状HI特征在窄波段频谱区间尤为突出，它们与光学星光偏振和极化热尘埃辐射测量出的平面-of-天空磁场方向很好地对齐。 我们分析了这些特征相对于视线速度的方向一致性，并提出了一种新的度量方法来量化这种HI一致性。 我们展示了HI一致性与353 GHz尘埃发射的偏振分数呈线性相关。 HI一致性构成了一种新颖的方法，用于测量弥漫星际介质中视线方向上的磁场缠绕程度。 我们提出了这一特性在基于HI的弥漫区域偏振尘埃发射模型中的应用，以及在宇宙微波背景（CMB）的偏振尘埃前景频率去相关研究中的应用。