论文标题
在RedShift 6.3上探索超级射电Quiet Quasar SDSS J0100+2802的无线电光谱能分布
Exploring the radio spectral energy distribution of the ultraluminous radio-quiet quasar SDSS J0100+2802 at redshift 6.3
论文作者
论文摘要
我们报告了深karl G. Jansky非常大的阵列（VLA）观察到了红船$ z = $ z = $ 6.3。我们检测到1.5 GHz，6 GHz和10 GHz的无线电连续发射。这导致无线电幂律频谱指数为$α= -0.52 \ pm0.18 $（$ s \proptoν^α$）。无线电源在所有VLA频段中都无法解决，其上限为$ 0.2^{\ prime \ prime} $（即$ \ sim $ 1.1 kpc）的大小为10 ghz。我们发现通量密度（增加$ \ sim 33 \％$）和2016年至2017年观测之间的频谱指数（陡峭）的变异性。我们还发现，同一年观察到的VLA 1.5 GHz通量密度是同一频率在2016年较长的基线阵列（VLBA）检测到的1.5倍。这种差异表明，J0100+2802的无线电发射中有一半来自40 PC内的紧凑型核心，其余的来自周围的几个KPC区域，该区域是分散的，并在VLBA观测中解决了。如果由恒星形成驱动，则扩散发射的要高四倍。我们得出的结论是，中央主动银河核是J0100+2802中无线电发射的主要动力发动机。
We report deep Karl G. Jansky Very Large Array (VLA) observations of the optically ultraluminous and radio-quiet quasar SDSS J010013.02 + 280225.8 (hereafter J0100+2802) at redshift $z=$6.3. We detected the radio continuum emission at 1.5 GHz, 6 GHz, and 10 GHz. This leads to a radio power-law spectral index of $α= -0.52\pm0.18$ ($S \propto ν^α$). The radio source is unresolved in all VLA bands with an upper limit to the size of $0.2^{\prime \prime}$ (i.e., $\sim$ 1.1 kpc) at 10 GHz. We find variability in the flux density (increase by $\sim 33\%$) and the spectral index (steepened) between observations in 2016 and 2017. We also find that the VLA 1.5 GHz flux density observed in the same year is 1.5 times that detected with the Very Long Baseline Array (VLBA) in 2016 at the same frequency. This difference suggests that half of the radio emission from J0100+2802 comes from a compact core within 40 pc, and the rest comes from the surrounding few kpc area which is diffuse and resolved out in the VLBA observations. The diffuse emission is four times brighter than that would be expected if driven by star formation. We conclude that the central active galactic nucleus is the dominant power engine of the radio emission in J0100+2802.
