In this work, we have searched for 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 2008 January 9 to 2019 May 9, using the weighted wavelet Z-transform (WWZ) and the Lomb-Scargle Periodogram (LSP) techniques. This is the first time to search for a periodic radio signal in the FSRQ PKS J0805–0111 by these two methods. Both methods consistently reveal a repeating signal with a periodicity of 3.38 0.8 yr (>99.7% confidence level). In order to determine the significance of the periods, the false alarm probability method was applied, 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 expect that the binary black hole scenario, where the QPO is caused by the precession of 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 10¹⁶ cm.

在这项工作中，我们搜索了欧文斯谷射电天文台 (OVRO) 40 m 望远镜在 2008 年 1 月 9 日至 2008 年期间监测的 FSRQ PKS J0805--0111 的 15 GHz 光变曲线中的准周期振荡 (QPO)。 2019 年 5 月 9 日，使用加权小波 Z 变换 (WWZ) 和 Lomb-Scargle 周期图 (LSP) 技术。这是首次通过这两种方法在 FSRQ PKS J0805-0111 中搜索周期性无线电信号。这两种方法始终显示重复信号的周期为 3.38 0.8 年（> 99.7% 置信水平）。为了确定周期的显着性，应用了虚警概率方法，并进行了大量的蒙特卡罗模拟。作为可能的解释，我们讨论了许多场景，包括薄磁盘场景的热不稳定性，螺旋喷流情景和双超大质量黑洞情景。我们预计双黑洞场景，其中 QPO 是由双黑洞进动引起的，是最可能的解释。FSRQ PKS J0805-0111 因此可能是一个很好的双黑洞候选者。在双黑洞场景中，初级黑洞和次级黑洞之间的距离约为 1.71 10¹⁶厘米。