Spitzer Spectroscopy of Stellar Feedback on Circumstellar Gas and Dust in 30 Doradus, the Nearest Super-Star Cluster

Astronomy and Astrophysics – Astronomy

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The feedback between massive stars and the interstellar medium dominates the evolution of their host galaxies. Therefore, 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. Super-star clusters are the sites of the most energetic star formation in the universe, particularly as one looks further back in time. The nearest super-star cluster, 30 Doradus in the Large Magellanic Cloud, presents an ideal opportunity to observe these interactions in detail.
Using the Spitzer infrared space telescope, we have obtained a complete spectral map of 30 Doradus in both the IRS low-resolution modules 5-38 μm) and the MIPS/SED mode (55-95 μm). As a nearby super-star cluster, 30 Doradus is a laboratory for studying the spectra of infrared-emitting species: dust, PAHs, and ionized gas. The spatially and spectrally complete data cube has unprecedented detail, allowing us to analyze conditions which vary dramatically on small spatial scales. The understanding that we gain from 30 Doradus and its circumcluster gas and dust can then be applied to interpret the spectra of distant, unresolved galaxies in the context of star formation. In this poster, we showcase the datacube in the context of a multi-wavelength view of 30 Doradus, and present preliminary results.

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