Parkes observations for project P1180 semester 2023APRS_01

We propose to carry out broadband follow-up observations of two new pulsars discovered in the ongoing SMART pulsar survey. PSR J1357-2530 is actually a re-discovery, but was originally reported in the literature with an incorrect name and discrepant dispersion measure, and no accurate position or timing solution available. PSR J0452-3418 is a new discovery from the SMART survey, with a spin period of 1.665 s and dispersion measure of $19.6\,pc\,cm^{-3}$. PSR J1357-2530 likely belongs to the rare class of low-luminosity, steep-spectrum pulsars; a class of pulsars that make up ~2% of the currently-known population of long-period pulsars. As such, understanding their emission and spectral properties is vital for developing a more comprehensive picture of the Galactic population of pulsars, and to make meaningful forecasts for the detectable population of pulsars in future low-frequency surveys, including those planned with SKA-Low. Follow-up of both pulsars is under way, using MWA archival data and targeted observations with the uGMRT (300-750 MHz). Parkes (Murriyang) observations will enable us to extend the frequency coverage to GHz frequencies, allowing us to investigate their pulse profile structure and single-pulse phenomenology in detail, including their frequency dependence.

我们提议对SMART脉冲星巡天（正在进行中）新发现的两颗脉冲星开展宽带后续观测。PSR J1357-2530实为重新发现的脉冲星，但其最初在文献中被报道时名称有误、色散量（dispersion measure）存在偏差，且缺乏准确的位置信息或计时解。PSR J0452-3418是SMART巡天的全新发现，自转周期为1.665秒，色散量为$19.6,pc,cm^{-3}$。PSR J1357-2530可能属于罕见的低光度陡谱脉冲星类别；该类别脉冲星约占目前已知长周期脉冲星总数的2%。因此，深入理解这类脉冲星的辐射与光谱特性，对于构建更全面的银河系脉冲星群体图景、以及对未来低频巡天（包括计划中的SKA-Low项目）中可探测的脉冲星群体做出有意义的预测至关重要。目前已利用MWA存档数据及uGMRT（300-750 MHz）的靶向观测对这两颗脉冲星开展后续研究。Parkes（Murriyang）望远镜的观测将把频率覆盖范围拓展至GHz频段，使我们能够详细研究其脉冲轮廓结构与单脉冲现象学特征，包括它们的频率依赖性。