Fundamental differences in the radio properties of red and blue quasars: insight from the LOFAR Two-metre Sky Survey (LoTSS)
Fundamental differences in the radio properties of red and blue quasars: insight from the LOFAR Two-metre Sky Survey (LoTSS)
复制标题
红色和蓝色类星体射电特性的根本差异：LOFAR 两米巡天 (LoTSS) 的见解
DOI：
10.1093/mnras/staa866
复制
发表时间：
2020
影响因子：
4.8
通讯作者：
G. Rivera
中科院分区：
文献类型：
--
作者：
D. Rosario;V. A. Fawcett;L. Klindt;D. Alexander;L. Morabito;S. Fotopoulou;E. Lusso;E. Lusso;G. Rivera
红色类恒星天体（qso）是活动星系核（agn）宇宙种群的发光端的一个子集，其中大多数是由沿其中心引擎视线的干扰尘埃染红的。在我们团队最近的工作中，我们开发了一种系统的技术，从斯隆数字巡天中选择红色qso，并使用20厘米射电巡天的微弱图像证明它们具有独特的射电特性。在这里，我们使用来自LOFAR两米巡天（LoTSS）的低频无线电数据扩展了我们的研究。随着LoTSS提供的深度的提高，我们确认了关键结果：与红移和吸积功率匹配的正常“蓝色”qso的对照样本相比，红色qso具有更高的无线电探测率和更高的致密无线电形态发生率。我们还首次证明了这些差异主要出现在中等无线电响度的来源上：无线电中等红色qso比典型qso常见3倍，但在我们的研究中，在最响亮的无线电系统和最安静的无线电系统中，过量的qso减少了。我们开发了蒙特卡罗模拟来探索恒星形成的差异是否可以解释这些结果，并得出结论，尽管恒星形成是无线电安静qso中低频发射的重要来源，但agn驱动的紧凑射电源群体最有可能是红色qso独特的低频射电特性的原因。我们的研究证实了红色和正常蓝色QSO群体之间一定存在根本差异的结论。
Red quasi-stellar objects (QSOs) are a subset of the luminous end of the cosmic population of active galactic nuclei (AGNs), most of which are reddened by intervening dust along the line of sight towards their central engines. In recent work from our team, we developed a systematic technique to select red QSOs from the Sloan Digital Sky Survey, and demonstrated that they have distinctive radio properties using the Faint Images of the Radio Sky at Twenty centimetres radio survey. Here we expand our study using low-frequency radio data from the LOFAR Two-metre Sky Survey (LoTSS). With the improvement in depth that LoTSS offers, we confirm key results: Compared to a control sample of normal ‘blue’ QSOs matched in redshift and accretion power, red QSOs have a higher radio detection rate and a higher incidence of compact radio morphologies. For the first time, we also demonstrate that these differences arise primarily in sources of intermediate radio loudness: Radio-intermediate red QSOs are × 3 more common than typical QSOs, but the excess diminishes among the most radio-loud systems and the most radio-quiet systems in our study. We develop Monte Carlo simulations to explore whether differences in star formation could explain these results, and conclude that, while star formation is an important source of low-frequency emission among radio-quiet QSOs, a population of AGN-driven compact radio sources is the most likely cause for the distinct low-frequency radio properties of red QSOs. Our study substantiates the conclusion that fundamental differences must exist between the red and normal blue QSO populations.
LOFAR-IRAS 交叉匹配研究：远红外射电相关性和 150 MHz 光度作为恒星形成率示踪剂
影响因子：
6.5
作者：
Wang L
通讯作者：
Wang L
使用 ALMA 观测和 EAGLE 流体动力学模拟识别来自遥远活动星系核的反馈的微妙特征
影响因子：
4.8
作者：
Scholtz J
通讯作者：
Scholtz J