Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1720c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.20; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
Using primarily data from 2MASS and GLIMPSE we examined three high-mass, southern, star-formation regions (central coordinates: G316.75-0.08, G321.05-0.50, G327.30-0.58; respective radii: 16', 27', 16'; respective distances: 2.9kpc, 4.1kpc, 2.9kpc). We incorporated the use of a 2-D radiation transfer model fitter, which enabled us to analyze our regions on a wide range of scales. We utilized the fitter's output data to map extinction levels; extract spectral energy distributions for protostellar candidates; put upper limits on YSO evolutionary stages; construct Initial Mass Functions, and measure preferred protostellar spacings. Within the fitting parameters we allowed for large variations in the possible distances and chi-squared values of the fitted models. With the exception of revisions on the most massive protostars in each region, and the removal of a detected binary star, we did no further corrections for poorly fitted sources; hoping that our pre-fitting criteria were sufficient, and that there was no bias in the distribution of such sources. We used CO emission data (Dame et al. 2001) and previous observations to determine the positions of masers, ultra-compact HII regions, and molecular clouds relative to areas of increased star formation. We conclude that both G316, and G327 are active star formation regions embedded in a large molecular complex, and that they both exhibit strong evidence for triggered star formation.
Chunev Georgi
GLIMPSE Team
Watson Christer
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