Light Periodicity Analysis of Blazar Object OJ 287 Based on Empirical Mode Decomposition |
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| Authors: | TANG Jie FU Ming-xing ZHANG Hao-jing LIU Xiao-qin |
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| Institution: | 1. School of Physics and Telecommunication Engineering, Shaanxi University of Technology, Hanzhong 723001;2. College of Physics, Electronics and Information, Yunnan Normal University, Kunming 650092;3. Hanzhong Vocational and Technical college, Hanzhong 723002 |
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| Abstract: | Considering the shortages of classical methods in periodicity analysis, the method of empirical mode decomposition (EMD) for processing nonlinear and non-stationary signals is applied to the V-band fluxes of OJ 287 from 1891 to 2010, 10 intrinsic mode functions with different timescales and a residual function are obtained from the light curve. The result shows that there exists a period of 12.34 yr in the V-band light variation of OJ 287, where the contribution rate of variance is maximal, and confirms that OJ 287 has a long-period variability in the V-band, and that the mean flux of OJ 287 tends to gradually decrease with time. |
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| Keywords: | BL Lacertae objects individual&mdash galaxies fundamental parameters&mdash methods analytical |
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