Parkes observations for project P1050 semester 2021APRS_12

This is a request for observing time for the timing campaign of new pulsar discoveries from the reprocessing of the low-latitude Galactic plane section of the HTRU survey (P630). We have now completed 80 % of the survey with GPU based coherent acceleration search, template bank and fast folding algorithm pipelines, and now have discovered 68 previously unknown pulsars and 21 "class A" pulsars awaiting confirmation. Interesting science can usually only be derived from a new pulsar after confirmation and a follow-up timing campaign is carried out. 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, spin-down rate, as well as to detect any unexpected behaviour of the pulsar which might result from emission instabilities. This timing project is necessary for the timing of the new double neutron star (DNS) system J1325-6253 discovered last semester and for following up our confirmed/to-be confirmed new pulsars from the HTRU Galactic plane survey. Pulsars on the observing list here have been confirmed and remaining candidates will be confirmed in the current 2020OCTS semester, the follow-up timing in 2021APRS will produce completely new and exciting results. In addition, this timing project will allow us to measure the advance of periastron of PSR J1325-6253, true Galactic plane pulsar population and boundaries of pulsar parameter space in the galactic plane.

本申请为HTRU巡天（P630）低银纬银河盘面区段再处理工作中新发现的脉冲星，申请开展计时观测所需的观测时长。目前我们已基于图形处理器（GPU）的相干加速搜索、模板库及快速折叠算法处理流程完成该巡天80%的工作，现已发现68颗此前未被发现的脉冲星，以及21颗待确认的“A类”脉冲星。通常而言，新发现的脉冲星仅在完成确认并开展后续计时观测计划后，才能产出具有科学价值的研究成果。对任意一颗新发现的脉冲星开展至少一年的初始计时观测，是完成其完整特性表征的最低时长要求，这对于推导脉冲星的特征年龄、磁场强度、自转减慢速率等参数，以及探测可能由辐射不稳定性引发的脉冲星异常行为均至关重要。本计时项目不仅可为上一观测学期发现的双中子星（double neutron star, DNS）系统J1325-6253提供计时观测支持，也可用于跟进我们在HTRU银河盘面巡天中已确认及待确认的新脉冲星。本观测列表中的脉冲星均已完成确认，剩余候选体将在当前2020年10月观测季中完成确认；于2021年4月观测季开展的后续计时观测，将产出全新且极具科学意义的成果。此外，本计时项目还可让我们测算PSR J1325-6253的近心点进动，探究真实的银河盘面脉冲星族群分布，并划定银河盘面内脉冲星参数空间的边界。