论文标题
带有Kat 7
Broad-band Radio Polarimetry of disk galaxies and AGN with KAT 7
论文作者
论文摘要
我们报告了附近两个磁盘星系，NGC 1808和NGC 1097的弧形分辨率和四个AGN动力无线电来源的广泛带（1.2-1.9 GHz）无线电连续观测。 PKS B1934-638，PKS B0407-658，J0240-231和J0538-440。我们使用旋转测量合成来分析其法拉第的复杂性。在南非使用Kat \ 7射电望远镜阵列进行观察。 AGN驱动的来源分为两个“法拉第”类别 - 简单而复杂。发现最偏振的源J0538-440和J0240-231具有复杂的法拉第光谱，可以是时间变量（J0538-440案例），并且还表明了沿视线的复杂法拉第发射和旋转组件。 PKS B0407-658显示了一个简单的法拉第频谱，而PKS B1934-638在极化中未发现。磁盘星系被归类为复杂，尽管在低信噪比下。这可能表明由于杆和周环区域中磁化等离子体的湍流以及/或l波段的频率依赖性去极化而引起的去极化
We report broad-band (1.2 - 1.9 GHz) radio continuum observations at arcminute resolutions of two nearby disk galaxies, NGC 1808 and NGC 1097, and four AGN powered radio sources; PKS B1934-638, PKS B0407-658, J0240-231, and J0538-440. We use Rotation Measure Synthesis to analyze their Faraday complexity. Observations were made with the KAT\,7 radio telescope array, in South Africa. The AGN powered sources fall into two "Faraday" categories -- simple and complex. The most polarized sources, J0538-440 and J0240-231, are found to have complex Faraday spectra that can be time variable (J0538-440 case) and also indicative of complex Faraday emitting and rotating components along the line of sight. PKS B0407-658 shows a simple Faraday spectrum while PKS B1934-638 is undetected in polarization. The disk galaxies are classified as complex, albeit at low signal-to-noise. This may indicate depolarization due to turbulence of the magnetised plasma in the bar and circumnuclear regions and/or frequency-dependent depolarization at L-band
