Multiple periods in the variability of the supermassive black hole binary candidate quasar PG1302-102?
Multiple periods in the variability of the supermassive black hole binary candidate quasar PG1302-102?
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DOI：
10.1093/mnrasl/slv111
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发表时间：
2015-02
影响因子：
4.8
通讯作者：
M. Charisi;I. Bartos;Z. Haiman;A. Price-Whelan;S. M'arka
中科院分区：
文献类型：
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作者：
M. Charisi;I. Bartos;Z. Haiman;A. Price-Whelan;S. M'arka
Graham等人（2015）发现了一个超大质量黑洞双星（SMBHB）候选者，并将检测到的5.2年光学变化周期确定为双星的轨道周期。流体动力学模拟预测多个周期组件的SMBHB的变化，从而提高了可能性，真正的周期的二进制是从5.2年不同。我们分析了PG 1302的周期图，没有发现其他峰的令人信服的证据。我们推导出任何额外的周期性调制的上限，在现有的数据，通过建模的光变曲线的红噪声和已知的5.2年的周期性成分的总和，并注入额外的正弦信号。我们发现，利用当前数据，如果变化幅度至少为~0.07 mag（与主峰的0.14 mag相比），我们将能够以高显著性（虚警概率<1%）检测到周期在模拟预测范围内的次级周期项。为期三年的跟踪监测活动，每周进行一次观测，可以提高检测次级峰值的灵敏度约50%，并允许对流体动力学模拟的预测进行更可靠的测试。
Graham et al. (2015) discovered a supermassive black hole binary (SMBHB) candidate and identified the detected 5.2 yr period of the optical variability as the orbital period of the binary. Hydrodynamical simulations predict multiple periodic components for the variability of SMBHBs, thus raising the possibility that the true period of the binary is different from 5.2 yr. We analyse the periodogram of PG1302 and find no compelling evidence for additional peaks. We derive upper limits on any additional periodic modulations in the available data, by modeling the light-curve as the sum of red noise and the known 5.2 yr periodic component, and injecting additional sinusoidal signals. We find that, with the current data, we would be able to detect with high significance (false alarm probability <1%) secondary periodic terms with periods in the range predicted by the simulations, if the amplitude of the variability was at least ~0.07 mag (compared to 0.14 mag for the main peak). A three-year follow-up monitoring campaign with weekly observations can increase the sensitivity for detecting secondary peaks ~50%, and would allow a more robust test of predictions from hydrodynamical simulations.