用周期图谱分析方法计算Blazar天体的光变周期

Computing the Period of Light Variability in Blazar Objects Using the Periodogram Spectral Analysis Method

对适用于等间隔时间序列的周期图谱分析方法进行了研究,用模拟信号进行了检验,证实了它适用于有噪声的时间序列.并把这种方法应用到类星体3C 279、3C 345,BL Lac天体OJ 287、ON 231的光变周期分析中,得到它们的光变周期分别为7.14年、10.00年、11.76年、6.80年.结果表明用周期图谱分析方法得到的结论和其他文献用Jurkevich方法得到的结论一致.获得的周期对进一步研究Blazar天体的物理机制很有帮助.还分析了窗函数的影响,指出它们的优缺点,便于在实际工作中做出正确选择.

The periodogram spectral analysis method for equally spaced data is discussed and the method is tested with modeling signals. The effectiveness of the periodogram spectral analysis is confirmed by applications in noise series. The method has been applied to analyze the period of the Blazar 3C 279,3C 345 and BL Lac Objects OJ 287,ON 231.Their periods are 7.14yr, 10.00yr, 11.76 yr and 6.80yr, which are consistent with other documents in Jurkevich method. The results are satisfying. The obtained periods are helpful to understand physical mechanisms of Blazars. The paper analyzes the influence of window function. Moreover, their advantages and disadvantages are discussed for the practical applications. The application results also indicate that in comparison to other traditional prediction methods, the prediction method used in this paper has a higher prediction accuracy. Thus it has theoretical meaning and practical value for the period of light variation prediction.