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Galaxy mergers play an important role in the growth of galaxies and theirsupermassive black holes. Simulations suggest that tidal interactions couldenhance black hole accretion, which can be tested by the fraction of binaryactive galactic nuclei (AGNs) among galaxy mergers. But determining thefraction requires a statistical sample of binaries. We have identifiedkpc-scale binary AGNs directly from high-resolution radio imaging. Inside the92 square deg covered by the high-resolution Very Large Array survey of theSloan Digital Sky Survey (SDSS) Stripe 82 field, we identified 22 grade A and30 grade B candidates of binary radio AGNs with angular separations less than5" (10 kpc at z = 0.1). Eight of the candidates have optical spectra for bothcomponents from the SDSS spectroscopic surveys and our Keck program. Two gradeB candidates are projected pairs, but the remaining six candidates are allcompelling cases of binary AGNs based on either emission line ratios or theexcess in radio power compared to the H-alpha-traced star formation rate. Onlytwo of the six binaries were previously discovered by an optical spectroscopicsearch. Based on these results, we estimate that ~60% of our binary candidateswould be confirmed once we obtain complete spectroscopic information. Weconclude that wide-area high-resolution radio surveys offer an efficient methodto identify large samples of binary AGNs. These radio-selected binary AGNscomplement binaries identified at other wavelengths and are useful forunderstanding the triggering mechanisms of black hole accretion.

Radio-Selected Binary Active Galactic Nuclei from the Very Large Array Stripe 82 Survey