Parkes observations for project P1050 semester 2023OCTS_08

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 1-2 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 2023OCTS will assist in completing many exciting large-term science goals.

本申请旨在申请观测时长，用于对通过重新处理HTRU-S巡天（HTRU-S LowLat）低银纬银道面区段观测数据所发现的新脉冲星开展计时观测项目。目前我们已完成HTRU-S LowLat巡天90%的观测处理工作，并基于GPU加速的相干加速搜索、模板库与快速折叠算法流程，完成了零加速PMPS（Parkes Multibeam Pulsar Survey）搜寻任务，共发现112颗此前未被发现的脉冲星，其中18颗来自PMPS搜寻结果。新脉冲星通常需经观测确认并开展后续计时观测项目，才能产出有科学价值的研究成果。为完整表征每一颗新发现脉冲星的物理特性，至少需要1至2年的初始计时观测时长——这是推导脉冲星特征年龄、磁场强度与自转减速率等关键参数，以及探测可能由辐射不稳定性引发的脉冲星异常行为的必要条件。本项目可为多类极具科学价值的脉冲星提供计时观测支持，包括双星脉冲星、高色散量（Dispersion Measure, DM）脉冲星、展宽轮廓脉冲星，以及在UWL波段拥有更大带宽辐射的亮脉冲星。除此之外，通过专属观测项目探究一颗特殊双星脉冲星系统的本质，亦是本项目的另一目标。2023OCTS观测学期的后续计时观测，将助力我们达成多项极具意义的长期科学目标。