The Long-term Light Variation of BL Lac Object 1ES 1959+650 |
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| Authors: | YUAN Yu-hai LIU Fu-qing |
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| Institution: | Center for Experiment, Guangzhou University, Guangzhou 510006 |
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| Abstract: | According to the data of optical observations of the Tuorla Observatory in Finland, using the power spectrum method, DCF (Discrete Correlation Function) method, and Jurkevich method, respectively, we analyzed the periodicity of the long-term light variation of the BL Lac object 1ES 1959+650, and obtained its light period to be P =1.4±0.3 yr. Assuming that the origin of the periodicity is concerned with the accretion disk, we obtained the region where the instability of this source occurs being R =9.65 Rg, here Rg represents the Schwarzschild radius. |
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| Keywords: | BL Lacertae objects individual 1ES 1959+650&mdash methods nu- merical |
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