Marta Sewilo


Young Stellar Objects in the Low-Metallicity Small Magellanic Cloud

Lynn R. Carlson (Universiteit Leiden), Jonathan Seale (STScI), Remy Indebetouw (Univ. of Virginia), Barbara Whitney (Space Science Institute), Margaret Meixner (STScI), Karl Gordon (STScI) and the SAGE-SMC Team


The Spitzer Legacy Program “Surveying the Agents of Galaxy Evolution in the Tidally-Disrupted, Low-Metallicity Small Magellanic Cloud” (SAGE-SMC) provides a comprehensive picture of the current star formation activity in the SMC which is traced by the IRAC (3.6, 4.5, 5.8, and 8.0 microns) and MIPS (24, 70, and 160 microns) bands. It allowed for the first time a global study of star formation in the SMC at high enough resolution to resolve individual cores and protostars at a range of mid-IR wavelengths. Using the SAGE-SMC photometry and images combined with the near-IR and optical data, we identified a population of massive young stellar objects (YSOs) in the SMC. Our methods involved color-magnitude selections, inspection of the multi-wavelength images, and fitting of the spectral energy distributions of the YSO candidates using the 2D radiative transfer models. We investigated the IR properties of the YSOs and how they relate to the galaxy's structure and gas and dust distribution.