16485

Nearly all galaxies harbor supermassive black holes and galaxy mergers are common in hierarchical galaxy formation. Therefore comma the study of dual (virgul1kpc separation) or binary (virgul1pc separation) supermassive black hole (SMBH) is very important to understand the co-evolution of SMBH and its host galaxy. However comma the number of confirmed dual or binary AGNs is small because most of the follow-up observations of the dual or binary SMBH candidates rely on a single observing band and therefore have a low success rate when one of the two (or both) AGNs is not visible in the chosen band. Based on the recent discovery of the radio-optical dual AGN demonstrating the importance of the multiband confirmation comma we propose a pilot study of dual-binary AGN search using both highresolution radio and NIR images from VLBA and HST in order not to miss AGN that is visible only in either one of the observing bands. This program will provide high-resolution radio and NIR images to measure the separation of the two AGNs with the estimate of the galaxy stellar mass and black hole mass comma and will demonstrate the power of using VLBA and HST(JWST in future) for a large scale systematic search for binary SMBHs.