Exploring Active Supermassive Black Holes at 100 Micro-arcsecond
  Resolution
  Super-high spatial resolution observations in the infrared are now enabling
major advances in our understanding of supermassive black hole systems at the
centers of galaxies. Infrared interferometry, reaching resolutions of
milliarcseconds to sub-milliarcseconds, is drastically changing our view of the
central structure from a static to a very dynamic one by spatially resolving to
the pc-scale. We are also starting to measure the dynamical structure of fast
moving gas clouds around active supermassive black holes at a scale of less
than a light year. With further improvements on resolution and sensitivity, we
will be able to directly image the exact site of the black hole's feedback to
its host galaxy, and quantify the effect of such interaction processes.
Near-future high angular resolution studies will definitely advance our mass
determinations for these black holes, and we might even witness the existence
of binary black hole systems at the center of galaxies.
