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arXiv 2512.03332astro-ph.GA
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一个三维模型用于局部大尺度星际磁场的反转

A three-dimensional model for the reversal in the local large-scale interstellar magnetic field

University of Calgary（卡尔加里大学）；University of British Columbia, Okanagan Campus（不列颠哥伦比亚大学奥肯那根校区）；Dominion Radio Astrophysical Observatory, Herzberg Research Centre for Astronomy and Astrophysics, National Research Council Canada（加拿大国家研究理事会赫茨伯格天体物理学与天文学研究中心 Dominion 射电天文台）；University of Western Ontario（韦仕敦大学（西安大略大学））；Stanford University（斯坦福大学）；INAF – Osservatorio Astrofisico di Arcetri（意大利国家天体物理研究所阿切特里天文台）；University of Tasmania（塔斯马尼亚大学）；INAF-Istituto di Radioastronomia（意大利国家天体物理研究所射电天文学研究院）

Rebecca A. Booth, Anna Ordog, Jo-Anne Brown, T. L. Landecker, Alex S. Hill, Jennifer L. West, Minjie Lei, S. E. Clark, Andrea Bracco, John M. Dickey, Ettore Carretti

备注：
Accepted for publication in The Astrophysical Journal
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AI总结：

该研究通过三维模型揭示了局部大尺度星际磁场的反转现象，利用DRAGONS数据展示了银河磁场的复杂结构及可能的磁反转平面。

摘要：

我们利用Dominion Radio Astrophysical Observatory (DRAO) 的 Global Magneto-Ionic Medium Survey (GMIMS) 对北半球天空内太阳附近1kpc范围内的大尺度银河磁场三维几何结构进行了探测。DRAGONS 是一项新的全偏振调查，覆盖北半球天空从350到1030MHz，覆盖赤纬-20° < δ < 90°，并是GMIMS的一部分。从DRAGONS中大于500MHz的法拉第深度光谱产生的第一时刻揭示出大角尺度的法拉第深度结构，其符号在南银河半球仅一次变化，在北银河半球两次变化，与其他法拉第旋转数据集的模式相同。DRAGONS是首个在保持对宽法拉第深度结构灵敏度的同时实现高法拉第深度分辨率的调查，使得首次利用银河经度-法拉第深度图成为可能。这些图揭示了天空中的法拉第复杂结构，表明一种板状场景，其中发射和法拉第旋转混合在一起。这种复杂性叠加在第一时刻图中出现的相同大尺度法拉第深度模式上。我们将这些模式建模为一个磁反转切过盘的对角线并通过银河坐标系中的太阳上方。我们将这种反转描述为一个平面，其法向量平行于沿(ℓ, b)=(168.5°, -60°)方向的线，并估计其距离在0.25到0.55kpc之间。我们的结果表明，观测到的法拉第天空可能主要由局部磁场配置主导。

英文摘要：

We probe the three-dimensional geometry of the large-scale Galactic magnetic field within 1 kpc of the Sun using the Dominion Radio Astrophysical Observatory (DRAO) Global Magneto-Ionic Medium Survey (GMIMS) of the Northern Sky (DRAGONS). DRAGONS is a new full polarization survey of the Northern sky from 350 to 1030 MHz covering declinations -20° < $δ$ < 90° and a component of GMIMS. The first moment of the Faraday depth spectra produced from DRAGONS above 500 MHz reveals large-angular-scale Faraday depth structures with signs that alternate only once in the Southern Galactic hemisphere and twice in the Northern hemisphere, patterns shared by other Faraday rotation datasets. DRAGONS is the first survey to achieve high Faraday depth resolution while maintaining sensitivity to broad Faraday depth structures, enabling the first use of Galactic longitude-Faraday depth plots. These plots reveal Faraday-complex structures across the sky, indicating a slab-like scenario in which emission and Faraday rotation are mixed. This complexity is overlaid on the same large-scale Faraday depth patterns that appear in the first moment map. We model these patterns as a magnetic reversal slicing through the disk on a diagonal and passing above the Sun in Galactic coordinates. We describe this reversal as a plane with a normal vector parallel to the line directed along ($\ell$, b) = (168.5°, -60°) and estimate its distance to be between 0.25 and 0.55 kpc. Our results show that much of the observed Faraday sky may be dominated by the local magnetic field configuration.

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