Galaxies 09: Assembly, Gas Content and Star Formation History of Galaxies
Jeremy Darling
University of Colorado
Lessons About Star Formation and Merging from Molecules and Dust
We present recent advances in our understanding of gas physics, star formation, and merging in galaxies based on multi-wavelength diagnostic studies of molecules and dust. In particular, we focus on the most extreme merger-induced starbursts and identify physical conditions that distinguish these from lesser starbursts. Non-thermal molecular tracers are particularly revealing, including OH megamaser emission and formaldehyde absorption of cosmic microwave background photons. We present a new understanding of the root causes of OH megamaser emission (and thus what OH megamasers physically indicate in major mergers), including Spitzer-derived dust properties. We suggest that these new insights can provide predictions for subsequent galaxy and black hole evolution and for the timing and duration of extreme starbursts. Finally, we look forward to ALMA-EVLA applications of these diagnostics at higher redshifts, spanning the history of cosmic star formation.
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