Parkes observations for project P1050 semester 2023APRS_09

This is a request for the observation time for the timing campaign of new pulsars discovered in the reprocessing of the low-latitude Galactic plane section of the HTRU-S survey (HTRU-S LowLat) and the Parkes Multibeam Pulsar Survey (PMPS). We have completed 90 % of the HTRU-S LowLat survey and completed zero acceleration PMPS search with GPU-based coherent acceleration search, template bank, and fast folding algorithm pipelines and now have discovered 112 previously unknown pulsars among which 18 were found in the PMPS. Interesting science can usually only be derived from a new pulsar after confirmation, and a follow-up timing campaign is carried out. At least one year of initial timing is the minimum timespan required to fully characterise any newly-discovered pulsars, essential for deriving pulsar parameters such as the characteristic age, magnetic field strength, and spin-down rate, as well as for detecting any unexpected behaviour of the pulsar which might result from emission instabilities. This project is necessary for the timing of several interesting pulsars, including binary pulsars, high DM pulsars, scattered profile pulsars, and bright ones that show emissions in larger bandwidths in the UWL band. Apart from this, finding the nature of a unique binary pulsar system via a dedicated observing campaign is also another goal. The follow-up timing in semester 2023APRS will assist in completing many exciting large-term science goals.

本请求旨在为两项脉冲星巡天再处理工作中发现的新脉冲星申请计时观测时长：其一为HTRU-S巡天（HTRU-S LowLat）的低银纬银河平面区域，其二为帕克斯多波束脉冲星巡天（Parkes Multibeam Pulsar Survey, PMPS）。我们已完成HTRU-S LowLat巡天90%的观测数据处理，并基于GPU加速的相干加速搜索、模板库及快速折叠算法流水线完成了PMPS巡天的零加速度搜索工作，目前已发现112颗此前未被报道的脉冲星，其中18颗来自PMPS巡天。新脉冲星的科学价值通常需在确认其身份并开展后续计时观测计划后才能得到充分挖掘。对新发现的脉冲星开展完整特性表征至少需要1年的初始计时观测时长，这是获取脉冲星特征年龄、磁场强度及自转减慢速率等关键参数，以及探测由射电辐射不稳定性引发的脉冲星异常行为的必要前提。本项目需对多类具有重要科学价值的脉冲星开展计时观测，包括双星脉冲星、高色散量（Dispersion Measure, DM）脉冲星、展宽脉冲轮廓脉冲星，以及在UWL波段具备大带宽射电辐射的亮脉冲星。此外，通过针对性观测计划探明一颗特殊双星脉冲星系统的本质属性，亦是本项目的另一研究目标。2023APRS学期的后续计时观测工作，将助力本项目达成多项具有深远意义的长期科学目标。