论文标题
研究通过同步加速器极化衍生物的局部磁场和磁性湍流各向异性
Studying the local magnetic field and anisotropy of magnetic turbulence by synchrotron polarization derivative
论文作者
论文摘要
由于观察到的视线方向不可避免地积累了观察到的信息，因此很难测量MHD湍流的局部磁场。但是，对局部磁场的正确理解是重建银河3D磁场的先决条件。我们研究了如何根据平方波长$ dp/dλ^2 $揭示局部磁场方向和涡流各向异性。在低频和强大的法拉第旋转方案中，我们在多种统计技术的组合中实施了数值模拟，例如结构函数，四极比率模量，光谱相关函数，相关函数各向异性和空间梯度技术。我们发现（1）$ dp/dλ^2 $的统计分析确实揭示了潜在的MHD湍流的各向异性，其程度随辐射频率的增加而增加； （2）相关函数各向异性的协同作用和$ dp/dλ^2 $的梯度计算可以实现局部磁场方向的测量。
Due to the inevitable accumulation of the observed information in the direction of the line of sight, it is difficult to measure the local magnetic field of MHD turbulence. However, the correct understanding of the local magnetic field is a prerequisite for reconstructing the Galactic 3D magnetic field. We study how to reveal the local magnetic field direction and the eddy anisotropy on the basis of the statistics of synchrotron polarization derivative with respect to the squared wavelength $dP/dλ^2$. In the low frequency and strong Faraday rotation regime, we implement numerical simulations in the combination of multiple statistic techniques, such as structure function, quadrupole ratio modulus, spectral correlation function, correlation function anisotropy and spatial gradient techniques. We find that (1) statistic analysis of $dP/dλ^2$ indeed reveals the anisotropy of underlying MHD turbulence, the degree of which increases with the increase of the radiation frequency; (2) the synergy of both correlation function anisotropy and gradient calculation of $dP/dλ^2$ enables the measurement of the local magnetic field direction.
