The Mass Function of the Arches Cluster from Gemini Adaptive Optics Data
  We present the mass function (MF) of the Arches cluster obtained from ground-based adaptive optics data in comparison with results derived from HST/NICMOS data. A MF slope of Gamma = -0.8 +- 0.2 is obtained. Both datasets reveal a strong radial variation in the MF, with a flat slope in the cluster center, which increases with increasing radius. 
Andrea Stolte (MPIA), Eva K. Grebel (MPIA), Wolfgang Brandner (ESO),   Donald F. Figer (STScI)