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A galaxy halo may contain a large number of intermediate mass black holes(IMBHs) with masses in the range of 10^{2-6} solar mass. We propose to directlydetect these IMBHs by observing multiply imaged QSO-galaxy or galaxy-galaxystrong lens systems in the submillimeter bands with high angular resolution.The silhouette of an IMBH in the lensing galaxy halo would appear as either amonopole-like or a dipole-like variation at the scale of the Einstein radiusagainst the Einstein ring of the dust-emitting region surrounding the QSO. Weuse a particle tagging technique to dynamically populate a Milky Way-sized darkmatter halo with black holes, and show that the surface mass density and numberdensity of IMBHs have power-law dependences on the distance from the center ofthe host halo if smoothed on a scale of ~ 1 kpc. Most of the black holesorbiting close to the center are freely roaming as they have lost their darkmatter hosts during infall due to tidal stripping. Next generationsubmillimeter telescopes with high angular resolution (< 0.3 mas) will becapable of directly mapping such off-nuclear freely roaming IMBHs with a massof ~ 10^6 solar mass in a lensing galaxy that harbours a O(10^9) solar masssupermassive black hole in its nucleus.

Direct Gravitational Imaging of Intermediate Mass Black Holes in Extragalactic Halos