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We report the detection of a stellar density cusp and a velocity dispersionincrease in the center of the globular cluster M54, located at the center ofthe Sagittarius dwarf galaxy (Sgr). The central line of sight velocitydispersion is 20.2 +/- 0.7 km/s, decreasing to 16.4 +/- 0.4 km/s at 2.5" (0.3pc). Modeling the kinematics and surface density profiles as the sum of a Kingmodel and a point-mass yields a black hole (BH) mass of ~ 9400 M_sun. However,the observations can alternatively be explained if the cusp stars possessmoderate radial anisotropy. A Jeans analysis of the Sgr nucleus reveals astrong tangential anisotropy, probably a relic from the formation of thesystem.

Density and kinematic cusps in M54 at the heart of the Sagittarius dwarf galaxy: evidence for a 10^4 M_sun Black Hole?