Magnetic Field in the Isolated Massive Dense Clump IRAS 20126+4104
Magnetic Field in the Isolated Massive Dense Clump IRAS 20126+4104
复制标题
孤立的大量致密团块中的磁场 IRAS 20126 4104
DOI：
10.1088/2041-8205/750/2/l29
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
et al.
中科院分区：
文献类型：
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作者：
Shinnaga;Kataoka;et al.
我们使用加州理工学院亚毫米波天文台的SHARC II偏振计SHARP测量了350 μm处朝向高质量恒星形成的大质量致密团块IRAS 20126+ 4104的偏振尘埃发射。大多数观测到的磁场矢量同意以及从数值模拟的情况下，当全球磁场线相对于致密团块的旋转轴倾斜的磁场矢量。数值模拟结果表明，旋转对大质量致密团簇及其磁场的演化起着重要的作用。冷CO 1-0双极流出的方向是平行于所观察到的磁场内的密集的团块以及全球磁场，从光学偏振数据推断，表明磁场也起着关键作用，在早期阶段的大规模星星形成。大质量（原）星星的大尺度开普勒盘以几乎与团包层相反的方向旋转。观测到的磁场形态和大质量致密团簇系统的反向旋转特征为磁场在大质量星星形成过程中的作用提供了限制的线索。
We measured polarized dust emission at 350 μm toward the high-mass star-forming massive dense clump IRAS 20126+ 4104 using the SHARC II Polarimeter, SHARP, at the Caltech Submillimeter Observatory. Most of the observed magnetic field vectors agree well with magnetic field vectors obtained from a numerical simulation for the case when the global magnetic field lines are inclined with respect to the rotation axis of the dense clump. The results of the numerical simulation show that rotation plays an important role on the evolution of the massive dense clump and its magnetic field. The direction of the cold CO 1–0 bipolar outflow is parallel to the observed magnetic field within the dense clump as well as the global magnetic field, as inferred from optical polarimetry data, indicating that the magnetic field also plays a critical role in an early stage of massive star formation. The large-scale Keplerian disk of the massive (proto) star rotates in an almost opposite sense to the clump's envelope. The observed magnetic field morphology and the counterrotating feature of the massive dense clump system provide hints to constrain the role of magnetic fields in the process of high-mass star formation.