Measurements of the CO-to-H 2 Conversion Factor and Dust-to-Gas ...
Measurements of the CO-to-H 2 Conversion Factor and Dust-to-Gas ...
Measurements of the CO-to-H 2 Conversion Factor and Dust-to-Gas ...
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Metallicity isn’t everything...<br />
Is this what we expect?<br />
- dust shielding controls C+/C/<strong>CO</strong> transition<br />
- in MW only 30-50% <strong>of</strong> gas H2 not in <strong>CO</strong> layer<br />
(Fermi Collab. 2010, Planck Collab. 2011)<br />
HI, C+ H 2<br />
<strong>CO</strong><br />
<strong>CO</strong>-free envelope<br />
Z > Z ⊙◉☉⨀<br />
potential 30%<br />
change in α<strong>CO</strong><br />
Z ⊙◉☉⨀<br />
decreasing metallicity DGR<br />
e.g. Maloney & Black 1988, Bolat<strong>to</strong> et al. 1999,<br />
Wolfire et al. 2010, Glover & Mac Low 2011
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