We present the results of a multifrequency, multiscale radio polarimetric study with the Very Large Array (VLA) of the Seyfert 1 galaxy and BALQSO, Mrk 231. We detect complex total and polarized intensity features in the source. Overall, the images indicate the presence of a broad, one-sided, curved outflow towards the south which consists of a weakly collimated jet with poloidal inferred magnetic fields, inside a broader magnetized ‘wind’ or ‘sheath’ component with toroidal inferred magnetic fields. The model of a kpc-scale weakly collimated jet/lobe in Mrk 231 is strengthened by its C-shaped morphology, steep spectral index throughout, complexities in the magnetic field structures, and the presence of self-similar structures observed on the 10-parsec-scale in the literature. The ‘wind’ may comprise both nuclear starburst (close to the core) and active galactic nuclei winds, where the latter maybe the primary contributor. Moving away from the core, the ‘wind’ component may also comprise the outer layers (or ‘sheath’) of a broadened jet. The inferred value of the (weakly collimated) jet production efficiency, ηjet ∼ 0.01, is consistent with the estimates in the literature. The composite jet and wind outflow in Mrk 231 appears to be low-power and matter-dominated, and oriented at a small angle to our line of sight.

中文翻译：

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偏振光中的 AGN 喷流和风：Mrk 231 的案例

我们展示了使用 Seyfert 1 星系和 BALQSO，Mrk 231 的超大阵列 (VLA) 进行的多频率、多尺度射电极化研究的结果。我们检测了源中复杂的总和极化强度特征。总体而言，这些图像表明存在一个向南的宽阔、单侧、弯曲的流出物，它由一个具有极向推断磁场的弱准直射流组成，位于一个具有环形推断磁场的更广泛的磁化“风”或“鞘”组件内. Mrk 231 中的 kpc 级弱准直射流/瓣模型通过其 C 形形态、陡峭的光谱指数、磁场结构的复杂性以及在 10 秒差距上观察到的自相似结构的存在得到了加强- 文献中的尺度。“风”可能包括核星暴（靠近核心）和活跃的星系核风，后者可能是主要贡献者。远离核心，“风”成分还可以包括加宽射流的外层（或“鞘”）。（弱准直）射流生产效率的推断值 ηjet ∼ 0.01，与文献中的估计值一致。Mrk 231 中的复合射流和风流出似乎是低功率和物质主导的，并且与我们的视线成小角度。与文献中的估计一致。Mrk 231 中的复合射流和风流出似乎是低功率和物质主导的，并且与我们的视线成小角度。与文献中的估计一致。Mrk 231 中的复合射流和风流出似乎是低功率和物质主导的，并且与我们的视线成小角度。