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

Title: 视线方向磁场缠绕的新探针

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. Show Chinese abstract

Abstract: 银河系中性氢（HI）在高银河纬度的天空中充满了线性结构。 在狭窄的光谱区间内尤为显著，这些线性HI特征与通过光学星光偏振和偏振热尘埃辐射测量的天球平面磁场方向很好地对齐。 我们分析了这些特征方向相对于视线速度的一致性，并提出了一种新的度量方法来量化这种HI一致性。 我们表明，HI一致性与353 GHz尘埃辐射的偏振分数线性相关。 HI一致性构成了一种测量弥散星际介质中视线方向磁场扭曲程度的新方法。 我们提出了这种特性的应用，用于基于HI的弥散区域偏振尘埃辐射模型，以及对宇宙微波背景偏振尘埃前景频率去相关性的研究。