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We investigate whether nuclear star clusters and supermassive black holesfollow a common set of mass scaling relations with their host galaxy'sproperties, and hence can be considered to form a single class of centralmassive object. We have compiled a large sample of galaxies with measurednuclear star cluster masses and host galaxy properties from the literature andfit log-linear scaling relations. We find that nuclear star cluster mass,M_{NC}, correlates most tightly with the host galaxy's velocity dispersion: logM_{NC} = (2.11 \pm 0.31) log (\sigma/54) + (6.63 \pm 0.09), but has a slopedramatically shallower than the relation defined by supermassive black holes.We find that the nuclear star cluster mass relations involving host galaxy (andspheroid) luminosity and stellar and dynamical mass, intercept with but are ingeneral shallower than the corresponding black hole scaling relations. Inparticular M_{NC} \propto {M}_{Gal,dyn}^{0.55 \pm 0.15}; the nuclear clustermass is not a constant fraction of its host galaxy or spheroid mass. Weconclude that nuclear stellar clusters and supermassive black holes do not forma single family of central massive objects.

Updated Mass Scaling Relations for Nuclear Star Clusters and a Comparison to Supermassive Black Holes