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人马座旋臂区域中磁场相对于银河系平面的分布

Distribution of the magnetic field relative to the plane of the Galaxy in the region of the Sagittarius spiral arm

R. R. Andreasyan, H. R. Andreasyan, A. M. Mickaelian, A. G. Suqiasyan, G. M. Paronyan

arXiv 2607.25587首次发表:更新:

AI 中文总结

研究人马座旋臂区域磁场与银河系平面关系,通过法拉第旋转数据,发现人马座旋臂磁场指向太阳,h=-300 pc平面以南旋转量度小源于南半球晕磁场,臂间区域晕磁场延伸到银河平面且南北半球晕磁场反转。

AI 中文摘要

利用492颗脉冲星和2700多个河外射电源的法拉第旋转数据,详细研究了银河经度33°<l<63°方向的磁场,该区域部分覆盖人马座旋臂区域。提出人马座旋臂位于h = -300 pc平面以北,其中h是距银河系平面的距离。(-)符号表示该平面位于银河系南半球。人马座旋臂的磁场指向太阳,此方向接近北半球晕磁场方向。h=-300 pc平面以南区域旋转量度的小绝对值仅归因于南半球晕磁场的贡献,其方向与北半球晕磁场及人马座臂磁场方向相反。在本地猎户座臂和人马座臂之间的臂间区域,晕磁场延伸到银河系平面,南北半球晕磁场在此处发生反转。

英文摘要

Faraday rotation data for 492 pulsars and more than 2,700 extragalactic radio sources were used to study the magnetic field, in detail, in the direction of Galactic longitude $33^o$ <l< $63^o$, which partially covers the Sagittarius spiral arm region. It was proposed that the Sagittarius spiral arm lies north of the h=-300 pc plane, where h is the distance from the Galactic plane. The (-) sign indicates that this plane is located in the southern hemisphere of the Galaxy. The magnetic field of the Sagittarius spiral arm is directed toward the Sun. This direction is close to the direction of the magnetic field of the northern hemisphere halo. The small absolute value of the rotation measures in the region south of the h=-300 pc plane is due solely to the contribution of the magnetic field of the southern hemisphere halo, which is directed opposite to the field of the northern hemisphere halo and the direction of the field in the Sagittarius arm. In the interarm region between the local Orion arm and the Sagittarius arm, the halo magnetic field extends to the Galactic plane, where a reversal of the magnetic fields of the halos of the northern and southern hemispheres occurs.

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