Calculating the Light Period of BL Lac Object S5 0716+714 by Wavelet Analysis Method |
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| Authors: | Hao-Jing Zhang Xiong Zhang Fu-Tong Dong Yong-Gang Zheng Ling Tang Li-Sheng Mao |
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| Institution: | 1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;2. Graduate School of Chinese Academy of Sciences, Beijing 100049;3. Department of Physics, Yunnan Normal University, Kunming 650092 |
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| Abstract: | A kind of wavelet analysis method for identifying the light period of the BL Lac object S5 0716+714 is introduced. The rather complete observed data in the four optical wavebands B, V, R, I are collected, and the long-term light curves based on 10-day averaging are obtained. On these light curves, the periodicity analysis is performed by using a wavelet analysis method. The result demonstrates that the wavelet analysis method is preferable for searching and identifying the light periods of BL Lac objects. From the contour map of the real part of the wavelet transform coefficient, the periodical light variations of the BL Lac object S5 0716+714 can be precisely identified. By analyzing the wavelet variance curves at the 4 wavebands, it is found that the BL Lac Object S5 0716+174 has a stable light period of 1160 days. This result is consistent with the 3.3-year period given by Raiteri et al. It is predicted that the next outburst in this object will happen around the August of 2011. |
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| Keywords: | BL Lac objects: individual: S5 0716+714 galaxies: fundamental parameter (luminosity) method: data analysis |
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