  We report the serendipitous multiwavelength discovery of a candidate dual
black hole system with a separation of ~100 pc, in the gas-rich luminous
infrared galaxy MCG-03-34-64 (z=0.016). Hubble Space Telescope/ACS observations
show three distinct optical centroids in the [O III] narrow-band and F814W
images. Subsequent analysis of Chandra/ACIS data shows two spatially-resolved
peaks of equal intensity in the neutral Fe Ka (6.2-6.6 keV) band, while
high-resolution radio continuum observations with the Very Large Array at 8.46
GHz (3.6 cm band) show two spatially-coincident radio peaks. Fast shocks as the
ionizing source seem unlikely, given the energies required for production of Fe
Ka. If confirmed, the separation of ~100 pc would represent the closest dual
AGN reported to date with spatially-resolved, multiwavelength observations.
