The HI-H 2 Transition and Star Formation in Early-Type Galaxies
The HI-H 2 Transition and Star Formation in Early-Type Galaxies
The HI-H 2 Transition and Star Formation in Early-Type Galaxies
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Summary<br />
• Observed <strong>HI</strong> surface density saturation <strong>and</strong> total surface density at the<br />
transition region are similar to that of early-type galaxies.<br />
• <strong>The</strong> Krumholz et al. (2009) dissociation models do a fair job of predict<strong>in</strong>g the<br />
molecular fraction <strong>in</strong> CO-rich early-type galaxies.<br />
• <strong>The</strong> cold gas systems of CO-rich early-type<br />
galaxies fundamentally resemble that of normal<br />
• Stability spiral models galaxies! are more or less consistent with observations. <strong>Star</strong> formation<br />
is occurr<strong>in</strong>g where we predict it to occur except where the gas is likely not yet<br />
settled <strong>in</strong>to the disk.<br />
• R mol<br />
is a much more shallow function of hydrostatic midplane pressure than<br />
observed for disk galaxies.