Computing the Periods of Light Variation of Blazar Objects 3C279 and OJ 287 with Autoregressive Spectral Analysis Method |
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Authors: | Jie Tang Xiao-juan Zhang Qiao Pang Hao-Jing Zhang Yong-Gang Zheng Xiong Zhang |
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Institution: | 1. Department of Physics, Shaanxi University of Technology, Hanzhong 723001;2. School of Biological Science and Engineering, Shaanxi University of Technology, Hanzhong 723001;3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;4. Department of Physics, Yunnan Normal Universuty, Kunming 650092 |
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Abstract: | The light variability is one of the main characteristics of blazar objects. Because of the complexity of their light curves, the present periodicity analysis methods are not yet perfect. Based on the modern spectral estimate theory, this paper has described in details the principles of the maximum entropy spectral estimate and autoregressive (AR) spectral estimate, analyzed the effect of the order number selection on the resultant model. Applying these methods to the periodicity analysis of the quasar 3C 279 and BL Lac object OJ 287, their light periods are obtained to be 7.14 and 11.76 yr, respectively. As is verified by experiments, the AR spectral estimate has a high resolution and is a rather good periodicity analysis method. Finally, the items noteworthy for the application of these spectrum estimation methods to the periodicity analysis of the light variations of blazars are mentioned. |
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Keywords: | BL Lac objects: individual (OJ 287) Quasars: individual (3C279) Galaxies: fundamental parameters Methods: analytical |
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