Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40650l&link_type=abstract
Spitzer Proposal ID #40650
Computer Science
Scientific paper
Galactic massive star formation regions can be studied with high resolution, but the large angular size, confusion along the line-of-sight, and heavy extinction in the Galactic plane make it difficult to determine the relationship among different stellar and gaseous components. However, new Spitzer Space Telescope observations have revealed 244 high-mass YSO candidates in the Large Magellanic Cloud (LMC) (Gruendl et al. 2007, in preparation). The selection of the sources is crucial in optimizing the science to Spitzer observing time. This new sample of massive protostars, coupled with the benefits of the LMC, such as known distance (50 kpc), nearly face-on orientation, and low foreground extinction, mitigates many observational difficulties. We propose to utilize our unique database of massive protostar candidates in the LMC to probe the evolutionary sequence of massive protostars with the IRS spectrometer. Our sample of 244 YSO candidates sample different environments (e.g. in clusters or isolated; embedded in molecular gas or not). In our large sample, we will compile an evolutionary sequence of sources that will start with ices and silicates, move toward less ices and more gas-phase absorption, then finally the gas-phase absorption disappears as, effectively, an HII region is born. In addition, these data are a singular probe of the organic chemistry occurring near massive stars that will help develop a consistent picture of massive star formation.
Blake Geoff
Brandl Bernhard
Brandner Wolfgang
Chen Rosie
Chu Y.-H. Y.-H.
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