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It has been suggested that ultra-compact dwarf (UCD) galaxies are the"threshed'" remains of larger galaxies. Simulations have revealed thatextensive tidal-stripping may pare a galaxy back to its tightly-bound, compactnuclear star cluster. It has therefore been proposed that the two-componentnature of UCD galaxies may reflect the original nuclear star cluster surroundedby the paltry remnants of its host galaxy. A simple quantitative test of thistheory is devised and applied here. If the mass of the central black hole inUCD galaxies, relative to the mass of the UCD galaxies' inner stellarcomponent, i.e. the suspected nuclear star cluster, matches with the (blackhole mass)-(nuclear star cluster mass) relation observed in other galaxies,then it would provide quantitative support for the stripped galaxy scenario.Such consistency is found for four of the five UCD galaxies reported to have amassive black hole. The (black hole mass)-(nuclear star cluster mass) relationis then used to predict the central black hole mass in two additional UCDgalaxies, and to reveal that NGC 205 and possibly NGC 404 (which only has anupper limit to its black hole mass) also follow this scaling relation.

A consistency-test for determining whether ultra-compact dwarf galaxies could be the remnant nuclei of threshed galaxies