论文标题
银河同步偏振前景中的半球义
Hemispheric handedness in the Galactic synchrotron polarization foreground
论文作者
论文摘要
银河系的大规模磁场被认为是由alpha-Omega Dynamo创建的，这意味着它应该在银河中部平面的北部和南部具有相反的手。在这里，我们尝试使用来自Wilkinson微波各向异性探针的极化数据来检测惯用性的变化。对全球粉尘和同步加速器发射的线性极化的平均值和平均值部分的先前分析集中在这两个组件的光谱空间和之间的二次相关上。相比之下，在这里，我们分析了奇偶校验的极化本身，并表明它的平均符号在北部和南部银河半球中的迹象相反。与银河平均场元模型的比较显示了广泛的定性一致性，并揭示了观察到的方位角平均平均奇偶校验偏振的半球依赖性的迹象不是由Alpha的符号来确定的，而是通过差异旋转的意义来确定。
The large-scale magnetic field of the Milky Way is thought to be created by an alpha-Omega dynamo, which implies that it should have opposite handedness North and South of the Galactic midplane. Here we attempt to detect a variation in handedness using polarization data from the Wilkinson Microwave Anisotropy Probe. Previous analyzes of the parity-even and parity-odd parts of linear polarization of the global dust and synchrotron emission have focused on quadratic correlations in spectral space of, and between, these two components. Here, by contrast, we analyze the parity-odd polarization itself and show that it has, on average, opposite signs in Northern and Southern Galactic hemispheres. Comparison with a Galactic mean-field dynamo model shows broad qualitative agreement and reveals that the sign of the observed hemispheric dependence of the azimuthally averaged parity-odd polarization is not determined by the sign of alpha, but by the sense of differential rotation.
