论文标题
VIK J2318-3113的VLBI观察，Z = 6.44
VLBI observations of VIK J2318-3113, a quasar at z = 6.44
论文作者
论文摘要
早期宇宙中活性银河核（AGN）中喷气机的性质及其对宿主星系的反馈仍然是一个高度局部的问题。通过很长的基线干涉法（VLBI）对高红移AGN的无线电结构进行观察提供了对其性质和在星系进化中的作用的必不可少的输入。到目前为止，使用VLBI技术研究了Redshift $ Z> 6 $的五个AGN。 VIKJ2318-3113是最近在Z = 6.44处发现的类星体，在当前工作之前尚未与VLBI成像。在这里，我们介绍了这款高红移类星体的第一个VLBI成像结果，目的是用对象的物理模型来证实其高分辨率外观。我们使用非常长的基线阵列以两个频率（1.6和4.7 GHz）进行了VIKJ2318-3113对VIKJ2318-3113进行VLBI相引用的观测，并在Milliarcsecond量表的无线电结构上获得了第一视图。在1.6 GHz时清楚地检测到该来源。我们发现其几乎所有的无线电发射都来自PC规模的核心区域。我们的双频观测限制了无线电芯的光谱指数和亮度温度。它的特性类似于其他已知的高红移无线电大风AGN。
The nature of jets in active galactic nuclei (AGN) in the early Universe and their feedback to the host galaxy remain a highly topical question. Observations of the radio structure of high-redshift AGNs enabled by very long baseline interferometry (VLBI) provide indispensable input into studies of their properties and role in the galaxies' evolution. Up to now, only five AGNs at redshift $z > 6$ have been studied with the VLBI technique. VIKJ2318-3113 is a recently discovered quasar at z = 6.44 that has not been imaged with VLBI before the current work. Here we present the first VLBI imaging results of this high-redshift quasar, with the aim of corroborating its high-resolution appearance with the physical model of the object. We carried out VLBI phase-referencing observations of VIKJ2318-3113 using the Very Long Baseline Array at two frequencies, 1.6 and 4.7 GHz, and obtained the first view at the radio structure on the milliarcsecond scale. The source was clearly detected at 1.6 GHz. We found that almost all of its radio emission comes from the pc-scale core region. Our dual-frequency observations constrain the spectral index and brightness temperature of the radio core. Its properties are similar to those of other known high-redshift radio-loud AGNs.
