Parkes observations for project P1139 semester 2022APRS_02

We have made the first direct detection of an ultra-long period magnetar, using a low-frequency sky survey performed by the Murchison Widefield Array (MWA). Its radio emission is highly polarised and periodic on a timescale of ~20 minutes. Its dynamic spectrum shows high-fluence narrow-timescale “spikes” which are unresolved by our data, with fluence approaching the Fast Radio Bursts generated by the\r\nGalactic centre magnetar. The source was visible in Q1 2018 but has since entered a quiescent state. In the event that it switches back on, we requre follow-up of this source to determine an accurate position, a wide-band spectral index, a precise dispersion measure, determination of its polarisation properties at high frequencies, and to better understand the emission on short timescales. Therefore, we are requesting triggered observations with ATCA and Parkes based on MWA monitoring. This semester we request to extend the triggering criterion to any similar source detected in an upcoming monitoring campaign of the Galactic plane using the MWA.

本研究依托默奇森宽场阵列（Murchison Widefield Array, MWA）开展的低频全天巡天，首次直接探测到一颗超长周期磁星。该源的射电辐射具备高度偏振特性，且周期约为20分钟。其动态频谱中存在高流量密度的窄时标尖峰，受当前数据分辨率限制无法被分辨，该尖峰的流量密度接近银心磁星产生的快速射电暴（Fast Radio Bursts）。该源在2018年第一季度可被观测到，但此后进入静默状态。若该源重新恢复活跃，我们需对其开展后续观测，以精确测定其位置、宽带谱指数、色散量（dispersion measure），获取其高频段的偏振特性，并深入理解其短时标辐射机制。据此，我们申请基于默奇森宽场阵列的监测结果，触发使用澳大利亚望远镜致密阵列（ATCA）与帕克斯望远镜（Parkes）开展观测。本观测季，我们申请将触发标准扩展至默奇森宽场阵列在即将开展的银道面巡天监测中探测到的所有同类源。