Quasiperiodic Behavior in the γ-Ray Light Curve of the Blazar PKS 0405-385
Quasiperiodic Behavior in the γ-Ray Light Curve of the Blazar PKS 0405-385
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DOI：
10.3847/1538-4357/ac6c8c
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
Yunlu Gong;Liancheng Zhou;Min Yuan;Haiyun Zhang;T. Yi;J. Fang
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作者：
Yunlu Gong;Liancheng Zhou;Min Yuan;Haiyun Zhang;T. Yi;J. Fang
我们分析了费米大面积望远镜从 2008 年 8 月到 2021 年 11 月探测到的平光谱射电类星体 PKS 0405-385 的历史光变曲线（QPO）。为了识别和确定PKS 0405-385在γ射线光变曲线中的QPO信号，我们使用了四种基于频域和时域的时间序列分析技术，即Lomb-Scargle周期图（LSP）、加权小波z变换（WWZ）、REDFIT和历元折叠。结果表明，PKS 0405-385 具有~2.8 年的准周期行为，在费米长期监测中具有~4.3σ 的显着性。值得注意的是，我们还利用LSP和WWZ技术对2014年10月至2021年10月观测到的G波段光变曲线进行了QPO分析，结果（显着性~4σ）与γ射线周期探测结果一致。这可能意味着光发射是由电子群以与γ射线发射相同的方式辐射的。在讨论准周期行为的可能机制时，无论是喷流内的螺旋运动还是超大质量黑洞双星系统都为2.8年的QPO提供了可行的解释，并且相关参数已经被估计。
We analyze the quasiperiodic oscillation (QPO) of the historical light curve of flat-spectrum radio quasars PKS 0405-385 detected by the Fermi Large Area Telescope from 2008 August to 2021 November. 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 quasiperiodic behavior of ∼2.8 yr with the significance of ∼4.3σ in Fermi long-term monitoring. Remarkably, we also performed QPO analysis in the G-band light curve observed from 2014 October to 2021 October using LSP and WWZ technology, and the results (∼4σ of significance) are consistent with the periodic detection in γ-ray. This may imply that the optical emission is radiated by an electron population in the same way as the γ-ray emission. In discussing the possible mechanism of quasiperiodic 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.