QUASI-PERIODICITIES AT YEAR-LIKE TIMESCALES IN BLAZARS
QUASI-PERIODICITIES AT YEAR-LIKE TIMESCALES IN BLAZARS
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DOI：
10.3847/0004-6256/151/3/54
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
A. Sandrinelli;S. Covino;M. Dotti;Aldo Treves
中科院分区：
文献类型：
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作者：
A. Sandrinelli;S. Covino;M. Dotti;Aldo Treves
我们在六个耀变体的光学-近红外波段的光曲线中寻找类似年的时间尺度的准周期性，并与高能发射进行了比较。我们从快速眼安装光度法和存档的中小型孔径研究望远镜系统数据中获得了光学/近红外光曲线，并获取了γ射线数据的费米光曲线。周期图经常显示光学和γ射线波段的强峰，在某些情况下可能是相互关联的。然后讨论揭示的峰值的意义，考虑到噪声是频率相关的。在类似年的时间尺度上，准周期性似乎经常出现在耀变体中。目前还没有描述这些可能的周期性的直接模型，但对引起这些源周期性变化的物理机制进行了一些合理的解释。
We searched for quasi-periodicities on year-like timescales in the light curves of six blazars in the optical—near-infrared bands and we made a comparison with the high energy emission. We obtained optical/NIR light curves from Rapid Eye Mounting photometry plus archival Small & Moderate Aperture Research Telescope System data and we accessed the Fermi light curves for the γ-ray data. The periodograms often show strong peaks in the optical and γ-ray bands, which in some cases may be inter-related. The significance of the revealed peaks is then discussed, taking into account that the noise is frequency dependent. Quasi-periodicities on a year-like timescale appear to occur often in blazars. No straightforward model describing these possible periodicities is yet available, but some plausible interpretations for the physical mechanisms causing periodic variabilities of these sources are examined.