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We present multi-color high-resolution imaging of the host galaxy of thedwarf Seyfert UGC 06728. As the lowest-mass black hole to be described withboth a direct mass constraint and a spin constraint, UGC 06728 is an importantsource for comparison with black hole evolutionary models, yet little is knownabout the host galaxy. Using Hubble Space Telescope imaging in the optical andnear-infrared, we find that UGC 06728 is a barred lenticular (SB0) galaxy withprominent ansae at the ends of the bar. We cleanly separated the AGN from theresolved galaxy with two-dimensional image decompositions, thus allowingaccurate surface brightness profiles to be derived in all filters from theouter edge of the galaxy all the way into the nucleus. Based on a sample of 51globular cluster candidates identified in the images, the globular clusterluminosity function predicts a distance to UCG 06728 of $32.5\pm3.5$ Mpc.Combining the galaxy photometry with the distance estimate, we derive astarlight-corrected AGN luminosity, the absolute magnitude of the galaxy, and aconstraint on the galaxy stellar mass of $\log M_{\star}/M_{\odot}=9.9\pm0.2$.

The Host Galaxy of the Dwarf Seyfert UGC 06728