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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<strong>The</strong> Molecular Fraction: <strong>HI</strong> Detected <strong>Early</strong>-<strong>Type</strong>s<br />
------ Krumholz et al. 2009 model<br />
Model assumptions:<br />
ζ’t=G’0<br />
Z=1.0<br />
Z=1.7<br />
Z’d=Z’g=Z’<br />
May not hold <strong>in</strong> <strong>Early</strong>-<strong>Type</strong>s<br />
Fit Paramaters:<br />
Z=5 Z=1.3<br />
Log 10<br />
(Z)== -0.2 to 0.4<br />
(e.g. Kuntschner et al. 2010)<br />
ϕ mol<br />
=10; ϕ CNM<br />
~10<br />
NGC 3032 <strong>and</strong> NGC 4150: High F mol<br />
at low Σ tot<br />
Z=17 Z=1.0<br />
Both galaxies show <strong>in</strong>dications of recent<br />
<strong>in</strong>teractions or gas accretion!<br />
10
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