LBA observations for project V615 semester 2023OCTS

We have recently discovered a candidate ultra-long period magnetar, which rotates just once every 75 seconds yet still produces radio pulses. This is potentially prototypical of a numerous source class that may be associated with energetic phenomena such as Fast Radio Bursts. Using LBA astrometry, we wish to determine the proper motion and parallax of this source, which will enable us to 1) estimate its transverse velocity and constrain birth scenarios, 2) potentially associate the source with a birth site, and 3) calibrate X-ray measurements of the neutron star temperature and hence cooling models. The final observation from an exploratory allocation of 4 epochs has recently been made, and the two epochs that have been correlated and reduced indicate that we will be able to meet the astrometric goals. Hence, we return now to propose for a further allocation of 4 epochs to complete the program.

我们近期发现了一颗候选超长周期磁星（ultra-long period magnetar），其自转周期仅为75秒，却仍能辐射射电脉冲。该源或许是一类数量众多的天体源的原型样本，此类源可能与快速射电暴（Fast Radio Bursts）等高能天文现象相关联。我们拟采用长基线干涉测量（Long Baseline Array, LBA）天体测量技术，测定该源的自行与视差，以此实现三大目标：1）估算其切向速度并约束其形成机制；2）有望将该源与其诞生位点建立关联；3）校准该中子星温度的X射线测量结果，进而完善冷却模型。此前通过探索性观测计划分配的4个观测时段的最终观测已于近期完成，经关联与数据归算的2个观测时段的数据表明，我们能够达成既定的天体测量目标。因此，我们此番再次提交申请，请求额外分配4个观测时段以完成本项目。