Parkes observations for project P1165 semester 2025APRS_03

We recently discovered two new pulsars J1849+1001 (35.1 ms) and J1839+0542 (57.9 ms) in a FAST pulsar survey at intermediate Galactic latitudes (PT2020_0141). Follow-up timing observations show that they are in circular orbits with massive companions. This suggests that PSR J1849+1001 and J1839+0542 can be classified as the intermediate-mass binary pulsar (IMBP). Their massive companions also make them promising systems to measure "Post-Keplerian" parameters through pulsar timing. These Parkes observations will be combined with regular timing observations with FAST or MeerKAT to measure "Post-Keplerian" parameters and then measure both neutron star and companion masses.

我们近期在银道面中间纬度的500米口径球面射电望远镜（Five-hundred-meter Aperture Spherical radio Telescope，FAST）脉冲星巡天项目（PT2020_0141）中，发现了两颗新脉冲星J1849+1001（周期35.1毫秒）与J1839+0542（周期57.9毫秒）。后续计时观测结果表明，这两颗脉冲星均处于拥有大质量伴星的圆轨道中。据此可将PSR J1849+1001与J1839+0542归类为中等质量双星脉冲星（intermediate-mass binary pulsar，IMBP）。其大质量伴星也使得这两个系统成为通过脉冲星计时测量“后开普勒”（Post-Keplerian）参数的优质候选体系。本次帕克斯（Parkes）观测数据将与FAST或梅尔克特（MeerKAT）的常规计时观测数据相结合，用于测量“后开普勒”参数，进而同时测定中子星与伴星的质量。