Molecular hydrogen content in nearby spirals

Details Molecular hydrogen content in nearby spirals Molecular hydrogen content in nearby spirals

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...97h&link_type=abstract

Spitzer Proposal ID #97

Physics

Scientific paper

It is believed that the ratio of molecular to atomic hydrogen remains constant as a function of radius in late type spirals. The reason why the former is not detected is that current methods of estimating the molecular gas mass are based on indirect CO measurements which are metallicity depended. If the H2 to HI ratio is constant then molecular gas could potentially constitute a considerable fraction of the dark matter of a galaxy. We wish to examine this hypothesis by directly mapping the molecular hydrogen profile, using the mid-IR H2 lines, in one edge-on and one face-on spiral galaxy.

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