The CO-H2 Conversion Factor in Galaxy Mergers

Details The CO-H2 Conversion Factor in Galaxy Mergers The CO-H2 Conversion Factor in Galaxy Mergers

2011-12-05

arxiv.org/abs/1112.1073v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Conference Proceedings for Galaxy Mergers in an Evolving Universe (Hualien, Taiwan); Editors: Wei-Hsin Sun, Nick Scoville

Scientific paper

The CO-H2 conversion factor in galaxies is typically described as bimodal: one value for discs and quiescent regions, and another (lower) value for mergers and starbursts. In this proceeding, I will describe both empirical observational evidence that the conversion factor varies with physical environment, as well as a theoretical model which aims to understand the physical processes which drive these variations. I present a functional form for Xco which can be applied to observations ranging in scale from ~70 pc to galaxy-wide scales, and show the consequences of the application of this model to the Kennicutt-Schmidt star formation law.

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