论文标题
用速度梯度技术测量的分子气的磁场I. Orion A
Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique I. Orion A
论文作者
论文摘要
磁场在分子云和恒星形成的演变中起重要作用。使用速度梯度技术（VGT）模型，我们使用12CO，13CO和C18O（1-0）发射线以0.07 PC测量了Orion A中的磁场。测得的B场显示了一个垂直于Orion A的整体形状A的东西方取向。从13CO和C18O获得的VGT磁场与从Planck 353 GHz粉尘极化以0.55 PC测量的B场一致。通过使用速度分解算法来去除密度效应可以显着提高VGT在使用12CO（1-0）线的跟踪磁场中的准确性。还估计了Davis-Chandrasekhar-Fermi（DCF）和MM2技术的七个子云，OMC-1，OMC-2，OMC-3，OMC-3，OMC-4，OMC-5，L 1641-N和NGC 1999的磁场强度，并且与以前的成果相吻合，并与零星相吻合。在较小的尺度下，VGT证明了一种测量磁场的好方法。
Magnetic fields play an important role in the evolution of molecular clouds and star formation. Using the Velocity Gradient Technique (VGT) model, we measured the magnetic field in Orion A using the 12CO, 13CO, and C18O (1-0) emission lines at a scale of 0.07 pc. The measured B-field shows an east-west orientation that is perpendicular to the integral shaped filament of Orion A at large scale. The VGT magnetic fields obtained from 13CO and C18O are in agreement with the B-field that is measured from the Planck 353 GHz dust polarization at a scale of 0.55 pc. Removal of density effects by using a Velocity Decomposition Algorithm can significantly improve the accuracy of the VGT in tracing magnetic fields with the 12CO (1-0) line. The magnetic field strength of seven sub-clouds, OMC-1, OMC-2, OMC-3, OMC-4, OMC-5, L 1641-N, and NGC 1999 has also been estimated with the Davis-Chandrasekhar-Fermi (DCF) and MM2 technique, and these are found to be in agreement with previous results obtained from dust polarization at far-infrared and sub-millimeter wavelengths. At smaller scales, the VGT proves a good method to measure magnetic fields.
