Parkes observations for project P1402 semester 2026APRS_03

We propose a dedicated Parkes/Murriyang timing campaign of the newly confirmed narrow-duty cycle (~6 %) millisecond pulsar (MSP) PSR J2147-3604. This source was identified in a reprocessing of the Green Bank North Celestial Cap (GBNCC) survey as a high-confidence candidate with a spin period of 3.2 ms, and a dispersion measure, DM of 17 pc/cc. The pulsar was subsequently confirmed by the Fermi--TRAPUM collaboration via MeerKAT beamforming localisation and Parkes follow-up. Parkes/UWL observations allocated using green time detected this pulsar between 700--1500~MHz, and confirmed that it's in a binary system. Due to its low DM, we also detected strong interstellar scintillation. We request 35~hr of Murriyang time using the UWL receiver and APOLLO backend to obtain a phase-coherent timing solution and to characterise its spin, orbital, and propagation properties. Since the pulsar is also associated with a FERMI source, a precise radio ephemeris will also enable sensitive searches for gamma-ray pulsations in Fermi-LAT data and assess PSR J2147-3604's suitability for pulsar timing arrays (PTAs) and future gamma-ray timing applications.

本研究提议针对新证认的窄占空比（~6%）毫秒脉冲星（millisecond pulsar，MSP）PSR J2147-3604，开展专属的帕克斯/穆里扬（Parkes/Murriyang）计时观测项目。该源在对绿岸北天帽（Green Bank North Celestial Cap，GBNCC）巡天的再处理数据中被识别为高置信度候选体，其自转周期为3.2毫秒，色散量（dispersion measure，DM）为17 pc/cc。该脉冲星随后由费米-TRAPUM（Fermi--TRAPUM）合作团队通过MeerKAT波束成形定位与帕克斯后续观测完成正式证认。利用绿色观测时间分配的帕克斯/UWL观测在700~1500 MHz频段内探测到该脉冲星，并确认其处于双星系统中。由于其色散量较低，我们还探测到了强烈的星际闪烁。我们申请使用UWL接收机与APOLLO后端获取35小时的穆里扬观测时间，以获得相位相干的计时解，并刻画其自转、轨道与传播特性。鉴于该脉冲星还与一个费米伽马射线源相关联，精确的射电星历表将支持在费米-LAT（Fermi-LAT）数据中开展高灵敏度的伽马射线脉冲搜索，并评估PSR J2147-3604适配脉冲星计时阵列（pulsar timing arrays，PTAs）与未来伽马射线计时应用的潜力。