论文标题
$γ$ - 射线光线曲线的准周期行为0405-385
Quasi-periodic behaviour in the $γ$-ray light curve of the blazar PKS 0405-385
论文作者
论文摘要
We analyze the quasi-periodic oscillation (QPO) of the historical light curve of FSRQs PKS 0405-385 detected by the Fermi LAT from August 2008 to November 2021. To identify and determine the QPO signal of PKS 0405-385 in the $γ$-ray light curve, we use four time series analysis techniques based on frequency and time domains, i.e., the LOMB-SCARGLE周期图（LSP），加权小波Z-Transform（WWZ），RedFit和Epoch折叠。结果表明，PKS 0405-385具有$ \ sim $ 2.8岁的准周期行为，其意义为$ \ sim $ 4.3 $σ$在Fermi长期监控中。值得注意的是，我们还使用LSP和WWZ技术在2014年10月至2021年10月观察到的G波段光线曲线中进行了QPO分析，结果（$ \ sim $ 4 $σ$具有重要意义）与$γ$ -Ray的定期检测是一致的。这可能意味着光发射被与\ gr \发射相同的电子群体辐射。在讨论准周期行为的可能机制时，射流中的螺旋运动或超质量黑洞二进制系统为QPO提供了2.8年的可行解释，并且已经估计了相关参数。
We analyze the quasi-periodic oscillation (QPO) of the historical light curve of FSRQs PKS 0405-385 detected by the Fermi LAT from August 2008 to November 2021. To identify and determine the QPO signal of PKS 0405-385 in the $γ$-ray light curve, we use four time series analysis techniques based on frequency and time domains, i.e., the Lomb-Scargle periodogram (LSP), the weighted wavelet z-transform (WWZ), the REDFIT and the epoch folding. The results show that PKS 0405-385 has a quasi-periodic behavior of $\sim$2.8 yr with the significance of $\sim$4.3$σ$ in Fermi long-term monitoring. Remarkably, we also performed QPO analysis in the G-band light curve observed from October 2014 to October 2021 using LSP and WWZ technology, and the results ($\sim$4$σ$ of significance) are consistent with the periodic detection in $γ$-ray. This may imply that the optical emission is radiated by an electron population same as the \gr\ emission. In discussing the possible mechanism of quasi-periodic behavior, either the helical motion within a jet or the supermassive black hole binary system provides a viable explanation for the QPO of 2.8 yr, and the relevant parameters have been estimated.
