论文标题
HERGS具有中间无线电功能的无线电特性
The radio properties of HERGs with intermediate radio powers
论文作者
论文摘要
在过去的十年中，高灵敏度无线电调查表明，局部无线电AGN种群以中度到低功率来源为主，并具有紧凑的星系尺度。具有中型无线电功率的高激光射电星系（HERGS）（22.5 $ <$ log（l $ _ {\ rm 1.4GHz} $）$ <$ 25.0 W Hz $^hz $^{ - 1} $）构成了该人群的重要子组，因为他们还有强有力的证据表明，它们还可以驱动多个量表上的多个尺度的量表。在这里，我们介绍了当地宇宙中16个此类HERG的样本（$ z <0.1 $）的高分辨率VLA观测值，以调查其无线电发射的形态，程度和光谱，以详细研究，直到sub-kpc量表。我们发现，大多数（56％）在观测值的有限分辨率下具有无法解决的结构（$ \ sim $ 0.3英寸）。尽管在其无线电结构的紧凑性上相似，但这些来源具有陡峭的无线电光谱和宿主的星系特性，它们与当地的低兴奋性射电射击（Lergs nobles）与当地的延伸（Lergs novers cyptive nibles cyptive nimed scroptive n of Scrotive n of Scrotive nim contive n ofercomption scroption nim contive nim conterive nim conterive nimenters。直径$ \ sim $ 1.4 $ - $ 19.0 kpc和多种形态：三个大规模的散布；需要进行其他高分辨率观察以进一步研究，并探测一些Seyfert星系显示扩展结构的$ \ Lessim $ 300 PC尺度。
In the past decade, high sensitivity radio surveys have revealed that the local radio AGN population is dominated by moderate-to-low power sources with emission that is compact on galaxy scales. High-excitation radio galaxies (HERGs) with intermediate radio powers (22.5 $<$ log(L$_{\rm 1.4GHz}$) $<$ 25.0 W Hz$^{-1}$) form an important sub-group of this population, since there is strong evidence that they also drive multi-phase outflows on the scales of galaxy bulges. Here, we present high-resolution VLA observations at 1.5, 4.5 and 7.5 GHz of a sample of 16 such HERGs in the local universe ($z<0.1$), conducted in order to investigate the morphology, extent and spectra of their radio emission in detail, down to sub-kpc scales. We find that the majority (56 per cent) have unresolved structures at the limiting angular resolution of the observations ($\sim$0.3"). Although similar in the compactness of their radio structures, these sources have steep radio spectra and host galaxy properties that distinguish them from local low-excitation radio galaxies (LERGs) that are unresolved on similar scales. The remaining sources exhibit extended radio structures with projected diameters $\sim$1.4$-$19.0 kpc and a variety of morphologies: three double-lobed; two large-scale diffuse; one jetted and `S-shaped'; one undetermined. Only 19 per cent of the sample therefore exhibit the double-lobed/edge-brightened structures often associated with their counterparts at high and low radio powers: radio-powerful HERGs and Seyfert galaxies, respectively. Additional high-resolution observations are required to investigate this further, and to probe the $\lesssim$300 pc scales on which some Seyfert galaxies show extended structures.
