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Super-high spatial resolution observations in the infrared are now enablingmajor advances in our understanding of supermassive black hole systems at thecenters of galaxies. Infrared interferometry, reaching resolutions ofmilliarcseconds to sub-milliarcseconds, is drastically changing our view of thecentral structure from a static to a very dynamic one by spatially resolving tothe pc-scale. We are also starting to measure the dynamical structure of fastmoving gas clouds around active supermassive black holes at a scale of lessthan a light year. With further improvements on resolution and sensitivity, wewill be able to directly image the exact site of the black hole's feedback toits host galaxy, and quantify the effect of such interaction processes.Near-future high angular resolution studies will definitely advance our massdeterminations for these black holes, and we might even witness the existenceof binary black hole systems at the center of galaxies.

Exploring Active Supermassive Black Holes at 100 Micro-arcsecond Resolution