Parkes observations for project P1113 semester 2021APRS_05

We propose observations with the Ultra-wide-bandwidth Low (UWL) receiver installed at the Parkes telescope to carry out a study of the giant micro-pulses. The giant micro-pulse is a rare phenomenon, in which the flux density is significantly greater than typical value at specific pulse phases, but the overall integrated flux density of the profile remains approximately constant. The physics of them are still unclear. The UWL receiver will provide us with information at widely separated frequency bands. The spectrum of the giant micro-pulse in a wide frequency range will be obtained, which is helpful to distinguish whether the emission physics for the giant micro-pulse and the normal micro-pulse are same. We will also obtain the polarisation profiles over wide-band and the dependence of pulse width and observation frequency to confirm their temporal origin. Finally, we will compare the polarisation properties of the giant micro-pulses to the typical giant pulses.

我们提议使用安装于帕克斯（Parkes）望远镜的超宽频带低（Ultra-wide-bandwidth Low, UWL）接收机，开展巨微脉冲（giant micro-pulses）的观测研究。巨微脉冲是一类罕见的天文现象：在特定脉冲相位处，其流量密度显著高于常规水平，但脉冲轮廓的总积分流量密度基本保持恒定。目前该现象背后的物理机制仍未明晰。该UWL接收机可提供宽间隔频带上的观测数据，我们将借此获取巨微脉冲在宽频范围内的频谱，以此区分巨微脉冲与常规微脉冲的辐射物理机制是否一致。此外，我们还将获取宽带偏振轮廓，以及脉冲宽度与观测频率的依赖关系，以验证其时间起源。最终，我们将对比巨微脉冲与典型巨脉冲的偏振特性。