Parkes observations for project P1365 semester 2025APRS_09

We propose a timing follow-up project for two newly discovered pulsars, J0915-6635 and J0917-6642, from the MWA-SMART survey. These pulsars were recently discovered from a blind periodic search of an 80-min SMART survey observation, with an localisation precision of 4 arcminutes. Initial flux density estimates suggest they are faint, requiring follow-up with the Parkes UWL receiver for precise timing solutions, flux density measurements, and polarimetric analysis. Initial analysis suggests a flux density 0.2-0.5 mJy for J0915-6635, and 0.1-0.3 mJy for J0917-6642 at 1.4 GHz, assuming a spectral index of -1.6. Observations with the Murriyang's UWL receiver will help enable a faster convergence to the full coherent timing solution and determine their spin and astrometric parameters, as well as further investigate this through measurements of pulsar flux densities and spectral indices. We will also perform a polarimetric analysis across a wide frequency range to better constrain the pulsars' geometries and emission properties.

本研究提出一项针对MWA-SMART巡天中两颗新发现脉冲星J0915-6635与J0917-6642的计时后续观测项目。这两颗脉冲星是近期通过对80分钟SMART巡天观测数据开展盲周期搜索发现的，定位精度达4角分。初步流量密度估算结果显示其亮度较弱，需使用帕克斯（Parkes）UWL接收机开展后续观测，以获取精确的计时解、流量密度测量值与偏振分析结果。初始分析表明，在1.4 GHz频段、谱指数为-1.6的假设条件下，J0915-6635的流量密度约为0.2~0.5 mJy，J0917-6642约为0.1~0.3 mJy。使用穆里扬（Murriyang）UWL接收机进行的观测，将有助于更快收敛至完整的相干计时解，并确定两颗脉冲星的自转参数与天体测量参数；同时可通过测量脉冲星的流量密度与谱指数，进一步开展相关研究。本项目还将在宽频段范围内开展偏振分析，以更精准地约束脉冲星的几何结构与辐射特性。