Parkes observations for project P1168 semester 2024OCTS_01

We discovered seven pulsars in the globular cluster Terzan 1 with the Green Bank Telescope (GBT) and have been timing them over the last 1.5 year with the Parkes Telescope. The discoveries include five fully-recycled millisecond pulsars (MSPs) with spin periods between 3 and 6 ms, a partially-recycled 11-ms MSP, and a pulsar with an unusually long spin period of 134 ms. With our Parkes timing campaign, we have confirmed that all seven pulsars are isolated, consistent with Terzan 1 being a core-collapsed cluster. The 134-ms pulsar has a characteristic age of 23 Myr and is thus an especially interesting discovery in the context of pulsar formation via electron-capture rather than core-collapse supernovae. (We will submit our paper detailing these results by autumn 2024.) Student collaborator Bhakta discovered an eighth MSP in Ter 1 and will use the P1168 dataset to time it. We have been granted continuing status through 2024OCT, with which we will continue timing Terzan 1 at Parkes in order to obtain long-baseline timing solutions. This long-term timing will yield measurements of proper motion and potentially additional spin derivatives that together can be used to probe the cluster dynamics, constrain intrinsic spin properties of the pulsars, and confirm the young vs. old nature of the 134 ms pulsar. In addition to timing, we will probe the pulsars' polarization properties and the Galactic magnetic field in the direction of Terzan 1. We will also search these observations for new pulsars that may have been missed in previous observations.本研究利用绿岸望远镜（Green Bank Telescope, GBT）在球状星团Terzan 1中发现了7颗脉冲星，并于过去1.5年间使用帕克斯望远镜（Parkes Telescope）对其开展计时观测。本次发现包含5颗自旋周期介于3至6毫秒之间的完全再循环毫秒脉冲星（millisecond pulsars, MSPs）、1颗部分再循环的11毫秒毫秒脉冲星，以及1颗自旋周期达134毫秒的超长周期脉冲星。通过帕克斯望远镜的计时观测项目，我们确认这7颗脉冲星均为孤立脉冲星，这与Terzan 1是核塌缩球状星团的结论相符。这颗134毫秒脉冲星的特征年龄为23百万年（Myr），因此在通过电子俘获而非核塌缩超新星形成脉冲星的研究框架下，该发现具有特殊的研究价值。（本研究的详细成果论文将于2024年秋季提交。）学生合作者Bhakta在Terzan 1（简称Ter 1）中发现了第8颗毫秒脉冲星，并将使用P1168数据集对其进行计时观测。我们的观测项目已获得延续至2024年10月的资助，借此我们将继续利用帕克斯望远镜对Terzan 1开展计时观测，以获取长基线计时解。此项长期计时观测将获得脉冲星的自行测量结果，以及潜在的额外自旋导数参数，这些数据可用于探究星团动力学、约束脉冲星的固有自旋特性，并验证这颗134毫秒脉冲星的年轻/年老属性。除计时观测外，我们还将探测这些脉冲星的偏振特性，以及Terzan 1方向的银河磁场。此外，我们还将对本次观测数据进行搜寻，以寻找此前观测中可能遗漏的新脉冲星。