An Analysis of Light Periods of BL Lac Object S5 0716+714 with the MUSIC Algorithm |
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| Authors: | TANG Jie |
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| Institution: | School of Physics and Telecommunication Engineering, Shaanxi University of Technology, Hanzhong 723001 |
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| Abstract: | The multiple signal classi?cation (MUSIC) algorithm is introduced to the estimation of light periods of BL Lac objects. The principle of the MUSIC algorithm is given, together with a testing on its spectral resolution by using a simulative signal. From a lot of literature, we have collected a large number of effective observational data of the BL Lac object S5 0716+714 in the three optical wavebands V, R, and I from 1994 to 2008. The light periods of S5 0716+714 are obtained by means of the MUSIC algorithm and average periodogram algorithm, respectively. It is found that there exist two major periodic components, one is the period of (3.33±0.08) yr, another is the period of (1.24±0.01) yr. The comparison of the performances of periodicity analysis of two algorithms indicates that the MUSIC algorithm has a smaller requirement on the sample length, as well as a good spectral resolution and anti-noise ability, to improve the accuracy of periodicity analysis in the case of short sample length. |
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| Keywords: | BL Lacertae Objects: individual&mdash galaxies: fundamental parameters&mdash methods: analytical |
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