论文标题
使用22.3 GHz CCS Zeeman拆分，在TMC-1C中测量磁场测量
Magnetic field measurement in TMC-1C using 22.3 GHz CCS Zeeman splitting
论文作者
论文摘要
密集分子云中磁场的测量对于理解恒星形成之前的碎裂过程至关重要。 CCS 22.3 GHz发射的无线电干涉测量值已从无星核TMC-1C中进行，使用Karl G. Jansky非常大，以搜索线路的Zeeman分裂，以限制磁场强度。朝着从灰尘峰的区域偏移，我们报告了CCS 2_1-1_0跃迁的Zeeman分裂的检测，其推断磁场为〜2 mg。如果我们将灰尘峰解释为TMC-1C的核心，并且我们已经检测到磁场为包膜的区域，那么我们对磁场的观察值与围绕超临界质量质量比率的核心的亚临界质量质量升值比率一致。基于TMC-1C核心的化学模型的相关时间尺度，用于形成核心的双极扩散时间尺度与相关的时间尺度一致。这项工作证明了深CCS观察的潜力，即对密集云中磁场强度进行未来的测量，进而了解磁场在恒星形成中的作用。
Measurement of magnetic fields in dense molecular clouds is essential for understanding the fragmentation process prior to star formation. Radio interferometric observations of CCS 22.3 GHz emission, from the starless core TMC-1C, have been carried out with the Karl G. Jansky Very Large Array to search for Zeeman splitting of the line in order to constrain the magnetic field strength. Toward a region offset from the dust peak, we report a detection of the Zeeman splitting of the CCS 2_1 - 1_0 transition, with an inferred magnetic field of ~2 mG. If we interpret the dust peak to be the core of TMC-1C, and the region where we have made a detection of the magnetic field to be the envelope, then our observed value for the magnetic field is consistent with a subcritical mass-to-flux ratio envelope around a core with supercritical mass-to-flux ratio. The ambipolar diffusion timescale for the formation of the core is consistent with the relevant timescale based on chemical modeling of the TMC-1C core. This work demonstrates the potential of deep CCS observation to carry out future measurements of magnetic field strengths in dense molecular clouds and, in turn, understand the role of the magnetic field in star formation.
