Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30653i&link_type=abstract
Spitzer Proposal ID #30653
Other
Scientific paper
Massive stars dominate the evolution of their host galaxies by energetic feedback into the interstellar medium. Therefore, if we wish to understand galaxy evolution, we must understand how massive star clusters process local gas and dust (radiatively and mechanically), and how strong stellar winds interact with the HII region. In particular, the most energetic form of star formation in the universe occurs in super star clusters, which are an increasingly dominant mode of star formation as one looks further back in time. The only super star cluster near enough to be studied in detail with Spitzer (or any other existing telescope) is 30 Doradus in the Large Magellanic Cloud. 30 Doradus is also the ideal massive cluster to study because it has a very well characterized stellar population, is extremely massive, and has subsolar metallicity. We propose a complete spectral map of the 30 Doradus region with the IRS low-resolution modules (5-38um) and MIPS/SED mode (55-95um). Analysis of the fine-structure lines and aromatic features, using sophisticated modeling tools already developed by our team, will allow a complete self-consistent understanding of how this super-star cluster is affecting its circumcluster gas and dust. Understanding the infrared emitting species (dust, PAHs, ionized gas) with this unprecedented level of detail is a necessary step to quantitavely connect the spectra of distant unresolved galaxies to the star formation in those galaxies. This detailed analysis relies on simultaneous mapping of multiple diagnostic line ratios and dust features, and thus can only be accomplished with Spitzer/IRS (many of the diagnostic lines are not observable through the atmosphere). Furthermore, conditions in 30 Dor are known to vary dramatically on small scales, so a spatially and spectrally complete data cube will be the only way to link the physical conditions of the gas, radiation, and dust.
Babler Brian
Boulanger Francois
Engelbracht Charles
Galliano Frederic
Gordon Karl
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