论文标题
$ z \ sim0.25 $ radio-quiet qsos中的kpc-scale无线电结构
Kpc-scale Radio Structure in $z\sim0.25$ Radio-Quiet QSOs
论文作者
论文摘要
我们介绍了最近在6 GHz观察到的128个无线电广播准恒星对象（QSO）的同质，光学选择的，体积限制的样本（$ 0.2 <z <0.3 $），并在6 GHz观察到，具有非常大的阵列（VLA）（$ \ sim0.33''$分辨率）。我们将这些新结果与早期（2010--2011）6-GHz观测值与C-Configuration（$ \ sim3.5''$）中的VLA进行了比较。虽然所有这些无线电广播QSO（RQQS）都无法解决$ 3.5'''$ scale（$ \ sim $ \ sim $ 14 kpc，$ z = 0.25 $），但我们在RQQ的一半$ 0.33'$ 1.33'$ $ \ sim $ \ sim $ 1.3 kpc（$ 1.3 kpc at $ z $ z = 0.25 $ z = 0.2555555 $ z = 0.25 $ z = 0.25 $ z = 0.25 $ 0.33'中，我们解决了鲜明的复杂下半度结构。通过比较两组观测值之间的通量密度测量值，我们证明了至少70％的RQQ人群中存在明显的亚半阶级无线电结构，并且中心成分平均占$ 65％的总$ 65％。一个RQQ，J0935+4819，显示出醒目的对称，双裂的形态，似乎是无线电的第一个确定示例 - $ \ MATHRM {\ textit {quite}} $ qSO，带有fr ii类型的形态，$ \ sim $ \ sim $ arcsec scecsec scale（progive a arcsec scale actectim capssec scale（$ \ sim arcsecs）（$ \ gtrsim $ \ gtrsim6 $ \ gtrsim6 $ \ kpc）。 In addition to revealing RQQ sub-galactic morphology, we employ counterparts from legacy (FIRST at 1.4 GHz) and recent (VLA Sky Survey at 3 GHz) VLA surveys to investigate radio spectral indices and potential variability over decades-long timescales for a subset of the RQQs, and for the cores of radio-intermediate and -loud sources in the parent sample of 178 QSOs.这些结果支持了越来越多的观念，即RQQ种群不是一个单片的现象，而是由主要由Starburst供电和喷射动力的星系组成的混合物。
We present analysis of a homogeneous, optically selected, volume-limited ($0.2<z<0.3$) sample of 128 radio-quiet quasi-stellar objects (QSOs) recently observed at 6 GHz with the Very Large Array (VLA) in A-configuration ($\sim0.33''$ resolution). We compare these new results to earlier (2010--2011) 6-GHz observations with the VLA in C-configuration ($\sim3.5''$). While all of these radio-quiet QSOs (RQQs) were unresolved on a $3.5''$ scale ($\sim$14 kpc at $z=0.25$), we resolve notable complex sub-galactic structures in about half of the RQQs at $0.33''$ resolution ($\sim$1.3 kpc at $z=0.25$). By comparison of flux density measurements between the two sets of observations, we demonstrate that significant sub-galactic-scale radio structure is present in at least 70% of the RQQ population, and that the central component accounts for an average of $\approx$65% of the total detected radio power. One RQQ, J0935+4819, shows striking symmetric, double-lobed morphology, and appears to be the first identified example of a radio-$\mathrm{\textit{quiet}}$ QSO with FR II type morphology on $\sim$arcsec scale (projected size of $\gtrsim6$ kpc). In addition to revealing RQQ sub-galactic morphology, we employ counterparts from legacy (FIRST at 1.4 GHz) and recent (VLA Sky Survey at 3 GHz) VLA surveys to investigate radio spectral indices and potential variability over decades-long timescales for a subset of the RQQs, and for the cores of radio-intermediate and -loud sources in the parent sample of 178 QSOs. These results support the growing notion that the RQQ population is not a monolithic phenomenon, but instead consists of a mixture of mainly starburst-powered and jet-powered galaxies.
