Parkes observations for project P1170 semester 2022OCTS_08

We request 15.5 hours of observations with the Parkes UWL receiver to search for giant pulses (GPs) in all seven pulsars in the Southern sky which are known to exhibit this phenomenon. The UWL receiver is particularly well-suited to such a study, since some GPs from known emitters have been found to be very narrow-band and so the observed emission rate is likely to be highly frequency-dependent. Additionally, the wide bandwidth allows one to detect spectral structures such as the 'banding' effect recently observed in GPs from some pulsars, similar to that observed in the spectra of fast radio bursts. These observations should provide a wealth of information about the underlying GP emission mechanism, and a stringent test of current theories.

本研究申请使用帕克斯UWL接收机（Parkes UWL receiver）开展共计15.5小时的观测，以搜寻南天天区已知会产生巨脉冲（giant pulses, GPs）现象的全部7颗脉冲星的巨脉冲信号。UWL接收机尤为适配此类研究，原因在于已有观测发现部分已知脉冲星的巨脉冲信号具有极窄的带宽特性，因此其观测到的辐射率大概率呈现高度的频率依赖性。此外，该接收机的超大带宽支持我们探测光谱结构，例如近期在部分脉冲星的巨脉冲信号中观测到的“条带效应”，该现象与快速射电暴（Fast Radio Bursts）光谱中观测到的特征类似。本次观测将为揭示巨脉冲辐射的内在机制提供丰富的科研数据，并可对现有相关理论开展严格的检验。