Parkes observations for project P1229 semester 2023OCTS_13

We propose a pulsar timing campaign of three millisecond pulsars discovered in previous pulsar searches of Fermi gamma-ray sources. Despite an original follow-up effort, it was not possible to produce a pulsar timing solution with which to detect the expected gamma-ray pulsations. The proposed campaign combines a set of dense, initial observations with additional observations at increasing separation, a bootstrap approach which is generally successful at constraining all the fundamental parameters of the pulsar timing solution. Securing the gamma-ray pulsations will enable probes of the radio and gamma-ray emission mechanisms and searches for multi-wavelength counterparts. And perhaps more importantly, it will allow these pulsars to be incorporated into the gamma-ray pulsar timing array, providing additional baselines which will increase its sensitivity to low-frequency gravitational waves.

本研究提出针对三颗毫秒脉冲星（millisecond pulsar）的脉冲星计时观测计划，这些脉冲星是此前在费米伽马射线源（Fermi gamma-ray source）的脉冲星搜寻工作中发现的。尽管已开展过初步的后续观测工作，但仍无法得到可用于探测预期伽马射线脉冲的脉冲星计时解。本计划将一系列高密度初始观测与间隔逐步增大的补充观测相结合，这一自举法（bootstrap approach）通常可有效约束脉冲星计时解的全部基础参数。成功获取伽马射线脉冲信号，将有助于开展射电与伽马射线辐射机制研究，并搜寻多波段对应体。而更为关键的是，这将使这些脉冲星得以纳入伽马射线脉冲星计时阵列（gamma-ray pulsar timing array），新增的观测基线将提升该阵列对低频引力波（low-frequency gravitational wave）的探测灵敏度。