Parkes observations for project P1139 semester 2022APRS_01

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.

我们利用默奇森广域阵列（Murchison Widefield Array，MWA）开展的低频巡天，首次直接探测到一颗超长周期磁星（ultra-long period magnetar）。其射电辐射具有高度偏振性，周期约为20分钟。动态频谱显示出高流量窄时间尺度的“尖峰”，这些尖峰无法被我们的数据分辨，其流量接近银心磁星产生的快速射电暴（Fast Radio Bursts）。该源在2018年第一季度可见，但此后进入宁静状态。若该源重新活跃，我们需对其进行后续观测，以确定精确位置、宽带谱指数、准确的色散量度（dispersion measure），测定高频偏振特性，并更好地理解其短时标辐射机制。因此，我们请求基于MWA监测数据，利用澳大利亚望远镜致密阵列（ATCA）和帕克斯望远镜（Parkes）开展触发观测。本学期，我们请求将触发标准扩展至MWA即将开展的银道面监测巡天中探测到的所有类似源。