Abstract
High dynamic range images on mas scale and the distribution of spectral index in the structure of the quasar 3C 286 were obtained from observations of global VLBI arrays at 5 and 1.66 GHz. There are two components located the center of the quasar, but we cannot decide which one is the real core from the spectral index. It is impossible that the structure of 3C 286 is the result of gravitational lensing. There may be two active black holes at the center, i.e., two central engines, each with its own jet extending in different directions.
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