Parkes observations for project P1149 semester 2022APRS_06

We propose Parkes follow-up observations of a new pulsar discovered from the ongoing SMART pulsar survey at the MWA. Initial analysis suggests that the pulsar likely belongs to the rare class of low-luminosity, steep-spectrum pulsars. The proposed observations will help verify this conjecture, through flux density measurements and spectral analysis of the pulsar, which will be possible by combining Parkes data along with those from MWA and the planned observations with the GMRT. This class of pulsars makes up ~2% of the currently-known population of long-period pulsars, and understanding their emission and spectral properties is vital to develop a more comprehensive picture of the Galactic population of pulsars, and to make meaningful forecast of the detectable population of pulsars in future low-frequency surveys, including those planned with SKA-Low. The proposed observations will also allow us to determine the pulsar's spin and astrometric parameters via regular timing observations, and possibly the pulsar's emission geometry via high-time resolution polarimetric analysis.

我们提议利用帕克斯（Parkes）望远镜开展后续观测，以研究在默奇森宽场阵列（Murchison Widefield Array, MWA）正在开展的SMART脉冲星巡天项目中发现的一颗新脉冲星。初步分析表明，该脉冲星大概率属于低光度陡谱脉冲星这一稀有类别。本次提议的观测将通过对该脉冲星的流量密度测量与谱分析验证上述推测，而将帕克斯望远镜的观测数据、默奇森宽场阵列的现有数据，与巨型米波射电望远镜（Giant Metrewave Radio Telescope, GMRT）的计划观测数据进行联合分析，即可完成这一验证。该类脉冲星约占目前已知长周期脉冲星总数的2%，明晰其辐射与谱特性，对于构建更全面的银河系脉冲星种群图景，以及对未来低频射电巡天（包括基于平方千米阵列低频段（Square Kilometre Array-Low, SKA-Low）的规划巡天）中可探测脉冲星种群作出合理预测，均具有至关重要的意义。本次提议的观测还可通过常规计时观测，精准测定该脉冲星的自转与天体测量参数；同时借助高时间分辨率偏振分析，或可揭示其辐射几何结构。