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arXiv 1801.08237astro-ph.GA
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射电星系NGC 612法拉第深度结构的宽带射电偏振观测

Revealing the Faraday Depth Structure of Radio Galaxy NGC 612 with Broad-Band Radio Polarimetric Observations

J. F. Kaczmarek, C. R. Purcell, B. M. Gaensler, X. Sun, S. P. O'Sullivan, N. M. McClure-Griffiths

摘要:

我们提出了全极化,宽带观测的射电星系NGC 612(PKS B 0131 -637)从1.3到3.1 GHz的使用澳大利亚望远镜紧凑阵列。相对较大的角度尺度的射电星系使其成为一个很好的候选人,调查的偏振机制负责观察到的法拉第深度结构。通过拟合复杂的偏振模型的偏振光谱的每个像素,我们发现,一个单一的偏振分量可以充分描述观测到的信号的大多数射电星系。虽然我们不能肯定地排除内部法拉第旋转,我们认为,大部分的法拉第旋转发生在一个薄的皮肤,环绕偏振发射。使用最小能量估计,我们发现隐含的总磁场强度为4.2 microG。

英文摘要:

We present full-polarisation, broadband observations of the radio galaxy NGC 612 (PKS B0131-637) from 1.3 to 3.1 GHz using the Australia Telescope Compact Array. The relatively large angular scale of the radio galaxy makes it a good candidate with which to investigate the polarisation mechanisms responsible for the observed Faraday depth structure. By fitting complex polarisation models to the polarised spectrum of each pixel, we find that a single polarisation component can adequately describe the observed signal for the majority of the radio galaxy. While we cannot definitively rule out internal Faraday rotation, we argue that the bulk of the Faraday rotation is taking place in a thin skin that girts the polarised emission. Using minimum energy estimates, we find an implied total magnetic field strength of 4.2 microG.

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