Statistical tracing of turbulent magnetic fields in the optically thick interstellar medium
Statistical tracing of turbulent magnetic fields in the optically thick interstellar medium
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DOI：
10.1093/mnras/stab236
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发表时间：
2021-03
影响因子：
4.8
通讯作者：
Bo Yang;Jianfu Zhang;A. Lazarian;J. D. Medeiros
中科院分区：
文献类型：
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作者：
Bo Yang;Jianfu Zhang;A. Lazarian;J. D. Medeiros
基于磁流体动力学（MHD）湍流模拟的高分辨率三维数据立方体，研究了如何利用速度梯度技术（VGT）、相关函数各向异性（CFA）和各向异性主成分分析（PCAA）来揭示光学厚星际介质内的磁场方向。将CO分子示踪剂作为辐射传递过程的示踪方法，我们发现VGT和CFA可以成功地跟踪平均磁场的方向，这与光学薄介质情况下获得的低分辨率数值结果很好地吻合。类似于光薄ISM的模拟，我们的模拟表明，PCCA在光厚介质中仍然不可用。VGT和CFA在高分辨率光谱观测中的协同应用有望获得有关星际磁场的宝贵信息。
Based on high-resolution 3D data cubes from a magnetohydrodynamic (MHD) turbulence simulation, we study how to reveal the direction of the magnetic field within the optically thick interstellar medium by using the velocity gradient technique (VGT), correlation function anisotropy (CFA), and principal component analysis of anisotropies (PCAA). Considering the CO molecular tracers as a tracing method for radiative transfer processes, we find that the VGT and CFA can successfully trace the orientation of mean magnetic fields, which is in good agreement with the low-resolution numerical results obtained in the case of an optically thin medium. Similar to the simulation of an optically thin ISM, our simulations show that PCCA is still unusable in optically thick media. The synergetic application of the VGT and CFA to high-resolution spectroscopic observations is expected to yield valuable information on the interstellar magnetic field.