The low-frequency linearly polarised radio source population is largely unexplored. However, a renaissance in low-frequency polarimetry has been enabled by pathfinder and precursor instruments for the Square Kilometre Array. In this second paper from the POlarised GaLactic and Extragalactic All-Sky MWA Survey-the POlarised GLEAM Survey, or POGS-we present the results from our all-sky MWA Phase I Faraday Rotation Measure survey. Our survey covers nearly the entire Southern sky in the Declination range $-82^\circ$ to $+30^\circ$ at a resolution between around three and seven arcminutes (depending on Declination) using data in the frequency range 169−231 MHz. We have performed two targeted searches: the first covering 25 489 square degrees of sky, searching for extragalactic polarised sources; the second covering the entire sky South of Declination $+30^\circ$ , searching for known pulsars. We detect a total of 517 sources with 200 MHz linearly polarised flux densities between 9.9 mJy and 1.7 Jy, of which 33 are known radio pulsars. All sources in our catalogues have Faraday rotation measures in the range $-328.07$ to $+279.62$ rad m−2. The Faraday rotation measures are broadly consistent with results from higher-frequency surveys, but with typically more than an order of magnitude improvement in the precision, highlighting the power of low-frequency polarisation surveys to accurately study Galactic and extragalactic magnetic fields. We discuss the properties of our extragalactic and known-pulsar source population, how the sky distribution relates to Galactic features, and identify a handful of new pulsar candidates among our nominally extragalactic source population.

中文翻译：

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偏振 GLEAM 调查 (POGS) II：长波长全天旋转测量综合调查的结果

低频线性极化的无线电源群在很大程度上是未开发的。然而，用于平方公里阵列的探路者和前身仪器已经启用了低频偏振测量的复兴。在来自极化银河和河外全天空 MWA 调查的第二篇论文中——极化 GLEAM 调查或 POGS——我们展示了我们的全天空 MWA 第一阶段法拉第自转测量调查的结果。我们的调查几乎覆盖了赤纬范围内的整个南方天空 $-82^\circ$ 到 $+30^\circ$ 使用 169-231 MHz 频率范围内的数据，分辨率约为 3 到 7 弧分（取决于偏角）。我们进行了两次有针对性的搜索：第一次覆盖 25 489 平方度的天空，寻找河外极化源；第二个覆盖了赤纬以南的整个天空 $+30^\circ$ ，寻找已知的脉冲星。我们共检测到 517 个源，其 200 MHz 线极化通量密度在 9.9 mJy 和 1.7 Jy 之间，其中 33 个是已知的射电脉冲星。我们目录中的所有源都具有范围内的法拉第旋转测量 $-328.07$ 到 $+279.62$ 弧度-2. 法拉第自转测量与高频测量的结果大体一致，但精度通常提高一个数量级以上，突出了低频极化测量在准确研究银河和河外磁场方面的能力。我们讨论了我们的河外和已知脉冲星源群体的特性，天空分布如何与银河特征相关，并在我们名义上的河外源群体中确定了少数新的脉冲星候选者。