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The census of binary active galactic nuclei (AGNs) is important in order tounderstand the merging history of galaxies and the triggering of AGNs. However,there is still no efficient method for selecting the candidates of binary AGNs.The non-synchronous variations of the two AGNs in one binary system will inducethe shift of the image centroid. Since the astrometric error is normally muchsmaller than the angular resolution of telescopes, it is possible to detectsuch shifts even in the unresolved system via multi-epoch observations. Weperform some simulations and find that hundreds of observations are required todiscover compact binary AGNs. This method is suitable for the futurelarge-scale surveys, e.g., the Large Synoptic Survey Telescope, and it mightlead to a large sample of binary AGNs with a 1-2 yr survey.

Finding binary active galactic nuclei by the centroid shift in imaging surveys