论文标题
窄线Seyfert 1 MRK 783的无线电结构与VLBA和E-Merlin
The Radio Structure of the Narrow-Line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
论文作者
论文摘要
在本文中，我们介绍了对狭窄线seyfert 1 Galaxy MRK783。1.6GHz观察的新无线电和光学观察的分析，该观察结果是用E-Merlin干涉仪进行的，证实了先前观察到的弥漫性发射的存在。很长的基线阵列（VLBA）还检测到1.6 GHz（L波段）和5 GHz（C波段）的核源。虽然L波段图像仅显示未解决的核心，但C波段图像以60°的位置角度显示了部分分辨的结构的存在。两个频段（$> 10^6 $ k）发射的亮度温度表明它是AGN生产的PC规模射流。相对陡峭的VLBA光谱指数（$α_{vlba} = 0.63 \ pm0.03 $）与Milliarcsecond尺度上的光学薄发射的存在一致。最后，我们研究了两种可能的情况，这些情况可能导致银河系中检测到的KPC和PC级无线电结构之间的错位。我们还分析了银河系的光学形态，这表明MRK 783在相对较近的时期进行了合并。
In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed. The Very Long Baseline Array (VLBA) also detects the nuclear source both at 1.6 GHz (L-Band) and 5 GHz (C-band). While the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure, at a position angle of 60°. The brightness temperature of the emission in both bands ($>10^6$ K) suggests that it is a pc-scale jet produced by the AGN. The relatively steep VLBA spectral index ($α_{VLBA} = 0.63\pm0.03$) is consistent with the presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.
