Gravity and Rotation Drag the Magnetic Field in High-mass Star Formation
Gravity and Rotation Drag the Magnetic Field in High-mass Star Formation
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DOI：
10.3847/1538-4357/abc019
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
H. Beuther;J. Soler;H. Linz;T. Henning;C. Gieser;R. Kuiper;W. Vlemmings;P. Hennebelle;S. Feng;Rowan J. Smith;A. Ahmadi
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文献类型：
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作者：
H. Beuther;J. Soler;H. Linz;T. Henning;C. Gieser;R. Kuiper;W. Vlemmings;P. Hennebelle;S. Feng;Rowan J. Smith;A. Ahmadi
从寒冷的星际介质中形成热恒星是天体物理学研究的核心。理解磁场在星星形成过程中的重要性仍然是一个重大挑战。随着阿塔卡马大型毫米波阵列的出现，通过极化观测研究磁场的潜力有了巨大的进步。然而，主要的问题仍然是磁场在多大程度上塑造了星星的形成过程，或者引力是否在很大程度上起主导作用。在这里，我们表明，对于高质量的恒星形成区域G327.3的磁场形态似乎主要是由重力收缩的中央大质量气体核心的星星形成的收益。我们发现，在该地区的外部，磁场是指向该地区的引力中心。为中心核馈电的丝状结构也呈现出指向引力中心的U形磁场形态，再次显示出朝向中心的引力拖曳。然后内部部分显示旋转签名，可能与嵌入的磁盘相关，并且磁场形态似乎是旋转主导的。因此，我们的研究结果表明，在这个区域，重力和旋转是主导的动力学和塑造磁场形态。
The formation of hot stars out of the cold interstellar medium lies at the heart of astrophysical research. Understanding the importance of magnetic fields during star formation remains a major challenge. With the advent of the Atacama Large Millimeter Array, the potential to study magnetic fields by polarization observations has tremendously progressed. However, the major question remains how much magnetic fields shape the star formation process or whether gravity is largely dominating. Here, we show that for the high-mass star-forming region G327.3 the magnetic field morphology appears to be dominantly shaped by the gravitational contraction of the central massive gas core where the star formation proceeds. We find that in the outer parts of the region, the magnetic field is directed toward the gravitational center of the region. Filamentary structures feeding the central core exhibit U-shaped magnetic field morphologies directed toward the gravitational center as well, again showing the gravitational drag toward the center. The inner part then shows rotational signatures, potentially associated with an embedded disk, and there the magnetic field morphology appears to be rotationally dominated. Hence, our results demonstrate that for this region gravity and rotation are dominating the dynamics and shaping the magnetic field morphology.