Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3904o&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #39.04; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
The presence of massive stars within starbursts undoubtedly plays a huge role in determining the physical conditions within the local ISM. High-mass stars formed within typical starbursts drastically affect the dynamics of the surrounding interstellar medium (ISM) through not only the release of ionizing photons which destroy molecular material, but also through supernova (SNe) explosions which provide thermal and kinetic energy input into the ISM. Using mid-IR fine structure line ratios, we previously determined the presence of strong anti-correlations which suggested that strong supernova-driven shocks are indeed present within low metallicity galaxies, and the PAH deficit within these objects may indeed be linked to the presence and strength of these shocks. However, it has not as yet been conclusively proved that shocks are the dominant process behind the PAH deficit. As a consequence, we use an expanded sample of archival Spitzer IRS data to further probe the nature of the ISM within dwarf starburst galaxies and the underlying causes of the PAH deficit, using a range of additional mid-IR ISM diagnostics.
Dudik Rachel
O'Halloran Brian
Satyapal Shobita
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