Parkes observations for project P1176 semester 2023APRS_03

Pulsars and their winds are among nature's most powerful particle accelerators, producing particles with energies up to a few PeVatrons. In addition to high-energy radiation from the magnetosphere, the rotational energy of a neutron star is carried away in the form of magnetized ultra-relativistic pulsar winds. Investigation of pulsar wind nebula (PWN) offers an excellent chance to determine the interaction details of relativistic flows with their surroundings that may never be possible in other classes of source. Our recent analyses of ASKAP observations of Galactic Plane uncovered previously known X-ray PWN CXOU J163802.6-471358 (nicknamed as Potoroo). Recently, we have successfully detected a pulsar candidate associated with Potoroo with Parkes telescope. It is detected at 3 GHz with a dispersion measure of DM = 1553 pc cm-3 and a rotation period of 65.74 ms. Here we propose timing observations for this pulsar with the Parkes Ultra-Wideband Low (UWL) receiver. Through pulsar timing, we will be able to obtain precise measurements of the pulsar position and proper motions, and the spin-down of the pulsar which enables us to independently estimate the age of the system. Long-term timing will also enable us to measure the parallax of the system and search for pulsation at high energies (i.e. X-ray and gamma-ray)

脉冲星及其星风是自然界中威力最强的粒子加速器之一，可将粒子加速至最高可达数拍电子伏特（PeV）的能量。除磁层产生的高能辐射外，中子星的自转能量还以磁化超相对论性脉冲星风的形式被携离。对脉冲星风云（pulsar wind nebula, PWN）的研究，为我们探究相对论性流与周围环境的相互作用细节提供了绝佳契机——这类细节在其他类型的天体源中几乎无法被观测到。我们近期基于澳大利亚平方公里阵列探路者（ASKAP）对银道面的观测数据分析，发现了此前已被认知的X射线脉冲星风云CXOU J163802.6-471358，其昵称为“波塔罗”（Potoroo）。近期，我们利用帕克斯（Parkes）望远镜成功探测到了与“波塔罗”相关的脉冲星候选体。该候选体在3 GHz频段被探测到，色散量（dispersion measure, DM）为1553 pc·cm⁻³，自转周期为65.74毫秒。在此，我们提议使用搭载超宽带低（Ultra-Wideband Low, UWL）接收机的帕克斯望远镜，对该脉冲星开展计时观测。通过脉冲星计时分析，我们将能够精确测定该脉冲星的位置与自行，以及其自转减速率，进而独立估算该系统的年龄。长期计时观测还将使我们得以测量该系统的视差，并搜寻高能频段（即X射线与伽马射线）的脉冲信号。