Parkes observations for project P996 semester 2018OCTS_02

We propose to measure the polarisation of ~200 pulsars (~100 this semester) using the Ultra-Wideband Low (UWL) receiver to investigate the structure of the Galactic disk magnetic field in and between distant spiral arms. Previous Parkes pulsar observations have revealed field reversals in nearby arm and interarm regions. We wish to exploit the greater sensitivity of the UWL receiver to extend this to more distant regions, thereby allowing us to distinguish more clearly between different models for the structure of the disk field. This work will have important implications for theories for the generation of Galactic magnetic fields and for other areas, e.g., cosmic-ray physics, which depend on a knowledge of the large-scale Galactic magnetic field for their interpretation.

我们计划利用超宽带低频（UWL）接收器测量约200颗脉冲星（本学期约100颗）的偏振特性，以研究遥远旋臂内部及旋臂间的银盘磁场结构。此前的帕克斯脉冲星观测已揭示邻近旋臂及旋臂间区域存在磁场反转现象。我们希望借助UWL接收器更高的灵敏度，将研究范围拓展至更遥远的区域，从而能更清晰地分辨银盘磁场结构的不同模型。这项工作将对银盘磁场生成理论及其他领域（如宇宙线物理）具有重要意义——这些领域的解释依赖于对大尺度银盘磁场的认知。