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The central regions of galaxies show the presence of massive black holesand/or dense stellar systems. The question about their modes of formation isstill under debate. A likely explanation of the formation of the central densestellar systems in both spiral and elliptical galaxies is based on the orbitaldecay of massive globular clusters in the central region of galaxies due tokinetic energy dissipation by dynamical friction. Their merging leads to theformation of a nuclear star cluster, like that of the Milky Way, where amassive black hole (Sgr A*) is also present. Actually, high precision N-bodysimulations (Antonini, Capuzzo-Dolcetta et al. 2012, ApJ, 750, 111) show a goodfit to the observational characteristics of the Milky Way nuclear cluster,giving further reliability to the cited `migratory' model for the formation ofcompact systems in the inner galaxy regions.

The Dense Stellar Systems Around Galactic Massive Black Holes