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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421478.0, MPI für Astronomie / Publikationen_mpia
The stellar mass distribution in the giant star forming region NGC 346
Authors:Sabbi, E.; Sirianni, M.; Nota, A.; Tosi, M.; Gallagher, J.; Smith, L. J.; Angeretti, L.; Meixner, M.; Oey, M. S.; Walterbos, R.; Pasquali, A.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Astronomical Journal
Start Page:173
End Page:181
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Deep F555W and F814W Hubble Space Telescope (HST ) Advanced Camera for Survey (ACS) images are the basis for a study of the present-day mass function (PDMF) of NGC 346, the largest active star-forming region in the Small Magellanic Cloud (SMC). We find a PDMF slope of Gamma = -1.43 ± 0.18 in the mass range 0.8-60 Msun, in excellent agreement with the Salpeter initial mass function (IMF) in the solar neighborhood. Caveats on the conversion of the PDMF to the IMF are discussed. The PDMF slope changes, as a 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 likely primordial considering the young age (~ 3 Myr) of NGC 346, and its clumpy structure which suggests that the cluster has likely not had sufficient time to relax. Comparing our results for NGC 346 with those derived for other star clusters in the SMC and the Milky Way (MW), we conclude that, while the star formation process might depend on the local cloud conditions, the IMF does not seem to be affected by general environmental effects such as galaxy type, metallicity, and dust content. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA Inc., under NASA contract NAS 5-26555.
Free Keywords:galaxies: star clusters; Magellanic Clouds; open clusters and associations: individual: NGC 346; stars: luminosity function; mass function
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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