Supermassive black hole binaries may exist in the centers of active galactic nuclei like radio galaxies. We imaged the radio galaxy 3C 66B at radio frequencies using the Very Long Baseline Interferometer and found that the unresolved radio core of 3C 66B shows well-defined elliptical motions with a period of 1.05 +/- 0.03 years. This result strongly suggests the orbital motion of a supermassive black hole binary.
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Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R ChinaChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Zhao, G. -Y.
Chen, Y. -J.
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Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R ChinaChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Chen, Y. -J.
Shen, Z. -Q.
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Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R ChinaChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Shen, Z. -Q.
Sudou, H.
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Gifu Univ, Fac Engn, Gifu 5011193, JapanChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Sudou, H.
Iguchi, S.
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Natl Astron Observ Japan, Tokyo 1818588, JapanChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Iguchi, S.
Murata, Y.
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Inst Space & Astronaut Sci, JAXA, Kanagawa 2298510, JapanChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Murata, Y.
Taniguchi, Y.
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Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, JapanChinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China