天炉座A，I的宽带无线电偏振测量：来自NGC 1316的平流热物质产生的去偏振斑片
Broadband radio polarimetry of Fornax A, I: Depolarized patches generated by advected thermal material from NGC 1316
摘要：
本文利用澳大利亚望远镜紧凑阵列（ATCA）的观测数据，对邻近的天炉座A射电星系在1.28- 3.1GHz范围内的偏振射电辐射进行了观测和分析。在这篇文章中，我们使用现代宽带偏振技术来研究叶中明显的低偏振（低$p$）斑块的性质和起源。我们解决了低- $p$补丁，并发现他们的低分数极化与复杂的频率相关的干扰产生的法拉第效应沿视线的极化信号。低$p$贴片在空间上与叶的磁结构中的界面相关，视线投射的磁场穿过该界面改变方向。天空投影的磁场方向和结构的空间相关性的总强度也被确定和讨论。我们认为，低$p$补丁，以及相关的视线磁场和其他相关现象的逆转，最好的解释是存在的$\mathcal{O}(10^9)$ $M_\odot$的磁化热等离子体在叶，壳或细丝结构，并可能平流从ISM的NCG 1316或其周围的ICM。我们的研究强调了空间分辨，宽带，全极化无线电观测的力量和实用性，以揭示无线电波瓣中流动行为和磁离子结构的新方面及其与周围环境的相互作用。
英文摘要：
We present observations and analysis of the polarized radio emission from the nearby radio galaxy Fornax A over 1.28--3.1 GHz, using data from the Australia Telescope Compact Array (ATCA). In this, the first of two associated papers, we use modern broadband polarimetric techniques to examine the nature and origin of conspicuous low-polarization (low-$p$) patches in the lobes. We resolve the low-$p$ patches, and find that their low fractional polarization is associated with complicated frequency-dependent interference in the polarized signal generated by Faraday effects along the line of sight. The low-$p$ patches are spatially correlated with interfaces in the magnetic structure of the lobe, across which the line-of-sight-projected magnetic field changes direction. Spatial correlations with the sky-projected magnetic field orientation and structure in total intensity are also identified and discussed. We argue that the low-$p$ patches, along with associated reversals in the line-of-sight magnetic field and other related phenomena, are best explained by the presence of $\mathcal{O}(10^9)$ $M_\odot$ of magnetized thermal plasma in the lobes, structured in shells or filaments, and likely advected from the ISM of NCG 1316 or its surrounding ICM. Our study underscores the power and utility of spatially-resolved, broadband, full-polarization radio observations to reveal new facets of flow behaviors and magneto-ionic structure in radio lobes and their interplay with the surrounding environment.
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