摘要
给出了4种分析类星体长周期光变的方法,用一个模拟的周期信号y=sinθ检验这4种分析方法,结果表明:(1)天体光变采样的数据点个数相对少到一定值时,Jurkevich方法、时间补偿离散傅里叶变换分析方法(DCDFT)、离散相关分析方法(DCF)和功率谱密度分析方法(PSD)的分析结果不一样,获取最短的连续数据点后,Jurkevich方法分析结果在4种方法中可能最为精确可靠,且计算方法简捷实用;(2)获得了Jurkevich分析方法的最佳参数,当m=9时分析结果最佳;(3)用m=9时的Jurkevich方法分析了类星体3C 279及3C 454.3的光变周期,得出3C 279的可能光变周期为(2.81±0.54)年,3C 454.3的可能光变周期为457 d。
This paper first introduces four methods for analyzing long-period variability of quasars, then uses a simulated periodic signal y=sinθ to test four methods. The analysis results show:(1) When the number of data points sampled by the celestial body is relatively small to a certain value, the analysis results of Jurkevich method, DCDFT method, DCF method and PSD method are different. After getting the shortest continuous data point, the analysis result of Jurkevich method is probably the most accurate and reliable among the four methods, and the calculation method is simple and practical.(2) The best parameters of the Jurkevich analysis method are obtained, and the best results are when m=9.(3) Using the Jurkevich method with m=9 to analyze the variability of 3 C 279 is about(2.81 ± 0.54) years and the variability of 3 C 454.3 is about 457 d.
引文
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