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Deep F555W and F814W Hubble Space Telescope ACS images are the basis for astudy of the present day mass function (PDMF) of NGC346, the largest activestar forming region in the Small Magellanic Cloud (SMC). We find a PDMF slopeof Gamma=-1.43+/-0.18 in the mass range 0.8-60 Mo, in excellent agreement withthe Salpeter Initial Mass Function (IMF) in the solar neighborhood. Caveats onthe conversion of the PDMF to the IMF are discussed. The PDMF slope changes, asa function of the radial distance from the center of the NGC 346 star cluster,indicating a segregation of the most massive stars. This segregation is likelyprimordial considering the young age (~3 Myr) of NGC346, and its clumpystructure which suggests that the cluster has likely not had sufficient time torelax. Comparing our results for NGC346 with those derived for other starclusters in the SMC and the Milky Way (MW), we conclude that, while the starformation process might depend on the local cloud conditions, the IMF does notseem to be affected by general environmental effects such as galaxy type,metallicity, and dust content.

The Stellar Mass Distribution in the Giant Star Forming Region NGC 346