论文标题
ZTF调查中大部分的可能的低频准周期振荡
Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey
论文作者
论文摘要
我们研究了来自Zwicky瞬态设施（ZTF）时间域调查的2103 Blazars中可能存在的准周期振荡（QPO）信号。我们检测到在这五个3。8年的光波段ZTF光曲线上观察到的五个大麻中的低频QPO信号。这些周期从$ \ gtrsim4σ$在Lomb-Scargle期间图和加权小波Z变换分析中检测到的144天到196天不等。我们使用相分散最小化技术发现一致的结果。在G波段光曲线中检测到类似的峰值，其意义略低为3 $σ$。这些时间尺度在光波段中的几乎周期性信号最有可能源自具有高洛伦兹因子的前进射流，与观察者的视线或等离子体斑点的移动紧密对齐。
We investigate the possible presence of quasi-periodic oscillation (QPO) signals in 2103 blazars from the Zwicky Transient Facility (ZTF) time-domain survey. We detect a low-frequency QPO signal in five blazars observed over these 3.8-year-long optical r-band ZTF light curves. These periods range from 144 days to 196 days detected at $\gtrsim 4σ$ significance levels in both the Lomb-Scargle periodogram and Weighted Wavelet Z-transform analyses. We find consistent results using the phase dispersion minimization technique. A similar peak is detected in the g-band light curves at a slightly lower significance of 3$σ$. Such nearly periodic signals on these timescales in optical wavebands most likely originate from a precessing jet with high Lorentz factor, closely aligned to the observer's line of sight or the movement of plasma blobs along a helical structure in the jet.
