论文标题
研究通过同步加速器偏振强度的可压缩磁流体动力湍流的各向异性
Studying Anisotropy of Compressible Magnetohydrodynamic Turbulence by Synchrotron Polarization Intensity
论文作者
论文摘要
基于同步加速器极化强度的统计分析，我们研究了可压缩磁流体动力（MHD）湍流的各向异性特性。二阶归一化结构函数，四极比模量和各向异性系数协同用来表征偏振强度的各向异性。根据分解前数据立方体，我们首先探讨了不同湍流方案中极化强度的各向异性，并发现最重要的各向异性发生在亚alfvénicCemime中。然后，使用该制度的分类后数据立方体，我们研究了Alfvén，慢速和快速模式的极化强度的各向异性。 AlfVén和慢速模式的极化强度的统计数据表明了显着的各向异性，而快速模式的极化强度的统计数据显示了各向同性结构，这与Cho＆Lazarian（2002）中提供的早期结果一致。结果，极化强度的四极比模量和各向异性系数都可以定量恢复潜在可压缩的MHD湍流的各向异性。两种方法的协同使用有助于提高磁场测量的可靠性。
Based on statistical analysis of synchrotron polarization intensity, we study the anisotropic properties of compressible magnetohydrodynamic (MHD) turbulence. The second-order normalized structure function, quadrupole ratio modulus and anisotropic coefficient are synergistically used to characterize the anisotropy of the polarization intensity. On the basis of pre-decomposition data cubes, we first explore the anisotropy of the polarization intensity in different turbulence regimes and find that the most significant anisotropy occurs in the sub-Alfvénic regime. Using post-decomposition data cubes in this regime, we then study the anisotropy of the polarization intensity from Alfvén, slow and fast modes. Statistics of polarization intensity from Alfvén and slow modes demonstrate the significant anisotropy while statistics of polarization intensity from fast modes show isotropic structures, which is consistent with the earlier results provided in Cho & Lazarian (2002). As a result, both quadrupole ratio modulus and anisotropic coefficient for polarization intensities can quantitatively recover the anisotropy of underlying compressible MHD turbulence. The synergistic use of the two methods helps enhance the reliability of the magnetic field measurement.
