论文标题
检测高红移FSRQ PKS J0805-0111的无线电曲线中的高信心振荡
Detection of a high-confidence quasi-periodic oscillation in radio light curve of the high redshift FSRQ PKS J0805-0111
论文作者
论文摘要
在这项工作中，我们在FSRQ PKS J0805-0111的15 GHz光曲线中搜索了准周期振荡（QPO），该曲线由欧文斯山谷无线电天文台（OVRO）40 m望远镜监测，使用重量范围内（2008年1月9日至2019年1月9日），使用权重的Z-s-evavellet-Z-sc）（ （LSP）技术。这是通过这两种方法第一次在FSRQ PKS J0805-0111中搜索定期无线电信号。所有两种方法都始终揭示一个重复信号，周期性为3.38 $ \ pm $ 0.8岁（$> $> $ 99.7 \％\％的置信度）。为了确定周期的重要性，使用了错误的警报概率方法，并进行了大量的蒙特卡洛模拟。尽可能解释，我们讨论了许多场景，包括薄磁盘的热不稳定性，螺旋喷气场景和二进制超级质量黑洞方案，我们期望二进制黑洞情景，其中QPO是由二进制黑洞的进攻引起的，是最可能的解释。因此，FSRQ PKS J0805-0111可能是一个好的二进制黑洞候选者。在二进制黑洞方案中，主要黑洞和次级黑洞之间的距离约为$ 1.71 \ times 10^{16} $ cm。
In this work, we have searched quasi-periodic oscillations (QPOs) in the 15 GHz light curve of the FSRQ PKS J0805-0111 monitored by the Owens Valley Radio Observatory (OVRO) 40 m telescope during the period from January 9,2008 to May 9,2019, using the weighted wavelet Z-transform (WWZ) and the Lomb-Scargle Periodogram (LSP) techniques. This is the first time to search for periodic radio signal in the FSRQ PKS J0805-0111 by these two methods. All two methods consistently reveal a repeating signal with a periodicity of 3.38$\pm$ 0.8 years ($>$99.7\% confidence level). In order to determining the significance of the periods, the false alarm probability method was used, and a large number of Monte Carlo simulations were performed. As possible explanations, we discuss a number of scenarios including the thermal instability of thin disks scenario, the spiral jet scenario and the binary supermassive black hole scenario, we expected that the binary black hole scenario, where the QPO is caused by the precession of the binary black holes, is the most likely explanation. FSRQ PKS J0805-0111 thus could be a good binary black hole candidate. In the binary black hole scenario, the distance between the primary black hole and the secondary black hole is about $1.71\times 10^{16}$ cm.
