Parkes observations for project P1148 semester 2022APRS_05

We propose observations with the ultra-wide-bandwidth, low frequency receiver (UWL) installed at the Parkes telescope to study a sample of pulsars known to exhibit mode changing phenomenon. The wide frequency range of the UWL receiver, along with the well-calibrated system, allowed us to obtain flux density measurements and polarization pulse profiles. The mode switch pattern in a wide frequency range will be obtained and can confirm whether this effect is dependent on observation frequency. The properties of polarization profiles of different modes in wide frequency will be studied. We will also obtain the spectrum of different modes, and compare spectral indexes of different modes for these mode changing pulsars. Our observations will allow us to constrain the physics origins of the mode changing phenomenon.

我们提议利用安装于帕克斯望远镜（Parkes Telescope）的超宽带宽低频接收机（UWL，ultra-wide-bandwidth, low frequency receiver），针对已知存在模式变换现象的脉冲星样本开展观测研究。该UWL接收机具备宽频覆盖能力，配合经过精准校准的观测系统，我们得以获取脉冲星的流量密度测量数据与偏振脉冲轮廓。我们将获取宽频范围内的模式切换特征，并借此验证该效应是否与观测频率存在相关性。我们还将研究不同模式下偏振轮廓在宽频范围内的特性。此外，我们将获取各模式的射电频谱，并对比这类模式变换脉冲星的不同模式频谱指数。本次观测将帮助我们限定模式变换现象的物理起源机制。