| 利用MUSIC算法分析BL Lac天体S5 0716+714光变周期 |
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| 引用本文： | 唐洁.利用MUSIC算法分析BL Lac天体S5 0716+714光变周期[J].天文学报,2012,53(1):1-8. |
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| 作者姓名： | 唐洁 |
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| 作者单位： | 陕西理工学院物理与电信工程学院 汉中723001 |
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| 基金项目： | 陕西省教育厅专项科研基金项目 |
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| 摘 要： | 将基于多重信号分类的MUSIC谱估计算法引入BL Lac天体光变周期分析中.给出了MUSIC算法的基本原理,利用模拟信号检测了算法的频谱分辨率.从大量文献中收集了BL Lac天体S5 0716+714光学V、R、I 3个波段从1994年到2008年的有效观测数据,用MUSIC算法和平均周期图算法分别计算了它们的光变周期,发现存在两个主要光变周期:一个是(3.33±0.08)yr的周期,另一个是(1.24±0.01)yr的周期.对这两种算法的周期估计性能进行了比较,结果表明,MUSIC谱估计算法对样本长度要求较低,具有良好的分辨特性和抗噪声能力,能提高在样本长度较短情况下光变周期分析的准确性.
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| 关 键 词： | 蝎虎天体 个别 星系 基本参数 方法 分析 |
An Analysis of Periodic Components in BL Lac Object S5 0716 +714 with MUSIC Method |
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| TANG Jie.An Analysis of Periodic Components in BL Lac Object S5 0716 +714 with MUSIC Method[J].Acta Astronomica Sinica,2012,53(1):1-8. |
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| Authors: | TANG Jie |
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| Institution: | TANG Jie (School of Physics and Telecommunication Engineering,Shaanxi University of Technology, Hanzhong 723001) |
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| Abstract: | Multiple signal classification(MUSIC) algorithms are introduced to the estimation of the period of variation of BL Lac objects.The principle of MUSIC spectral analysis method and theoretical analysis of the resolution of frequency spectrum using analog signals are included.Prom a lot of literatures,we have collected a lot of effective observation data of BL Lac object S5 0716+714 in V,R,I bands from 1994 to 2008.The light variation periods of S5 0716+714 are obtained by means of the MUSIC spectral analysis method and periodogram spectral analysis method.There exist two major periods:(3.33±0.08) years and(1.24±0.01) years for all bands.The estimation of the period of variation of the algorithm based on the MUSIC spectral analysis method is compared with that of the algorithm based on the periodogram spectral analysis method.It is a super-resolution algorithm with small data length,and could be used to detect the period of variation of weak signals. |
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| Keywords: | BL Lacertae objects individual galaxies fundamental parameters methods analytical |
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