Abstract Research on dual active galactic nuclei (AGNs) is crucial for understanding the coevolution of galaxies and supermassive black holes. However, the current number of dual AGNs remains scarce. In this work, we selected 171 new dual AGNs, four AGN triplets, and one AGN quadruplet from the Million Quasars Catalog, all with low redshift ( z h 70 − 1 kpc, but drops to one pair at > 55 h 70 − 1 kpc. Our study also explores the wide separation ( r p > 10 kpc) dual AGNs, finding 164 such systems, with 25 displaying clear tidal features. Furthermore, some extra galaxies, AGNs, and/or their candidates were found in the same regions of the pairs or multiplets, forming interacting systems with these pairs or multiplets.
Deng et al. (Thu,) studied this question.