Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545915g&link_type=abstract
American Astronomical Society, AAS Meeting #215, #459.15; Bulletin of the American Astronomical Society, Vol. 42, p.488
Other
Scientific paper
30 Doradus is the most powerful star forming region in the LMC. It contains also the most nearby massive star cluster. It presents a unique opportunity to study the effect of intense star formation on the surrounding ISM, and understand the details of the physics in distant starburst galaxies.
Using Spitzer spectral mapping of the region, we extracted both the spatial variations of the PAH-to-continuum intensity ratio and of the PAH band-to-band intensity ratios. We first showed that the latter quantities are a tracer of the charge of the molecules and therefore of the physical conditions, by ruling out other causes of variations, like variations in the size distribution or radiative transfer effects (selective extinction, variations of the local mean intensity). One of the striking features of this region is that the PAH band ratios span a significantly smaller range of variations than in other, Galactic, regions and extragalactic sources, such as M 17, the Orion bar or M 82 (Galliano et al. 2008, ApJ, 679, 310). This is an indication of differences in morphology of the ISM. It implies that the regions dominating the PAH emission are subject to more uniform conditions than in solar metallicity environments.
Then, to quantify the variations of the physical conditions, we combined the results from the modeling of the ionic lines in 30 Doradus (Indebetouw et al. 2009, ApJ, 694, 84) with the far-IR SED. This modeling allows us to estimate the contribution of diffuse ionized gas and dense PDRs to the IR emission. By comparing those quantities to the measured PAH band ratios, we constrain the relation of the band ratio to the physical conditions.
Consortium S.
Galliano Frederic
Hony Sacha
Indebetouw Remy
Madden Suzanne
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