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
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Σtot, ΣH2, Σ<strong>HI</strong> Versus Radius<br />
RCO<br />
15”<br />
RCO<br />
7”<br />
Green: <strong>HI</strong> surface density<br />
Black: H2 surface density<br />
Orange: <strong>HI</strong>+H2 surface density<br />
• Σ<strong>HI</strong> does not saturate above 9-10 M⨀ pc -2 for<br />
any of the sample galaxies.<br />
RCO<br />
15”<br />
RCO<br />
15”<br />
• Σ<strong>HI</strong> saturation occurs near RCO except for<br />
NGC 3032.<br />
• NGC 4150 has extremely low Σ<strong>HI</strong> throughout.<br />
RCO<br />
15”<br />
50”<br />
• Field E’s (NGC 807, UGC 1503) saturate at<br />
~5 M⨀ pc -2 whereas the field S0’s (NGC 3032,<br />
NGC 3656, NGC 5666) saturate at ~9-10 M⨀<br />
pc -2 .<br />
RCO<br />
Morphological correlation or resolution<br />
effects?.<br />
8
Change language