论文标题
用速度梯度建模银河前景极化
Modeling of Galactic Foreground Polarization with Velocity Gradients
论文作者
论文摘要
由于与银河前景相比，原始B模式极化的检测仍然具有挑战性。为了从前景中删除贡献，是必不可少的银河磁场的全面图片。速度梯度技术（VGT）在追踪磁场中有望基于对磁流动力湍流的现代理解。在这项工作中，我们将VGT应用于包含中间速度云和局部速度云的HI区域，这些速度可以在位置位置 - 速度空间中区分。我们表明，VGT与普朗克极化和恒星极化给出了极好的一致性。我们确认VGT在构建3D银河磁场方面的优势。
The detection of primordial B-mode polarization is still challenging due to the relatively low amplitude compared to the galactic foregrounds. To remove the contribution from the foreground, a comprehensive picture of the galactic magnetic field is indispensable. The Velocity Gradient Technique (VGT) is promising in tracing magnetic fields based on the modern understanding of the magneto-hydrodynamic turbulence. In this work, we apply VGT to a HI region containing an intermediate velocity cloud and a local velocity cloud, which are distinguishable in position-position-velocity space. We show that VGT gives an excellent agreement with the Planck polarization and stellar polarization. We confirm the advantages of VGT in constructing the 3D galactic magnetic field.
