标题： 1.3--10 GHz范围内36个离散射电天体的宽带法拉第旋转和偏振行为研究 显示英文标题

标题： A study of broadband Faraday rotation and polarization behaviour over 1.3--10 GHz in 36 discrete radio sources

摘要： 我们对36个离散的极化射电源进行了宽频带的极化分析，在非常宽且密集采样的频率范围内进行。 我们的样本是根据1.4 GHz窄带档案数据中出现的极化行为选择的：样本的一半在这些频率下表现出复杂的频率依赖性极化行为（即法拉第复杂性），而另一半表现出相对简单的行为（即它们看起来是法拉第简单）。 我们使用澳大利亚望远镜阵列（ATCA）对样本进行了全极化重新观测，具有6 GHz的密集采样频率覆盖范围，从1.3到10 GHz。 我们设计了一种通用的极化建模技术，使我们能够识别源中的多个极化发射成分，并表征它们的特性。 我们在样本中的几乎每个源中都检测到了法拉第复杂行为。 一些源表现出特别显著的极化行为。 通过比较我们的新数据和档案数据，我们发现了一些源的宽频带积分极化谱存在时间变化。 在一些情况下，极化发射成分的特性，包括它们辐射的法拉第深度范围、时间变化、光谱指数以及源的线性尺度，使我们能够认为光谱偏振数据包含了关于活动星系核自身磁离子环境的信息。 此外，数据对这种物质的几何结构和磁离子结构施加了直接的约束。 我们讨论了受限频带对极化结构检测和解释的影响，以及对未来光谱偏振调查的含义。 显示英文摘要

摘要： We present a broadband polarization analysis of 36 discrete polarized radio sources over a very broad, densely-sampled frequency band. Our sample was selected on the basis of polarization behaviour apparent in narrowband archival data at 1.4 GHz: half the sample show complicated frequency-dependent polarization behaviour (i.e. Faraday complexity) at these frequencies, while half show comparatively simple behaviour (i.e. they appear Faraday simple). We re-observed the sample using the Australia Telescope Compact Array (ATCA) in full polarization, with 6 GHz of densely sampled frequency coverage spanning 1.3 to 10 GHz. We have devised a general polarization modelling technique that allows us to identify multiple polarized emission components in a source, and to characterize their properties. We detect Faraday complex behaviour in almost every source in our sample. Several sources exhibit particularly remarkable polarization behaviour. By comparing our new and archival data, we have identified temporal variability in the broadband integrated polarization spectra of some sources. In a number of cases, the characteristics of the polarized emission components, including the range of Faraday depths over which they emit, their temporal variability, spectral index, and the linear extent of the source, allow us to argue that the spectropolarimetric data encodes information about the magnetoionic environment of active galactic nuclei themselves. Furthermore, the data place direct constraints on the geometry and magnetoionic structure of this material. We discuss the consequences of restricted frequency bands on the detection and interpretation of polarization structures, and implications for upcoming spectropolarimetric surveys.