Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-16
Astronomy and Astrophysics
Astrophysics
2 pages, Conference paper at IAU Symposium 220, "Dark Matter in Galaxies"
Scientific paper
In the last few years new evidence has been presented for the presence of ongoing massive star formation in the outer HI disks of galaxies. These discoveries strongly suggest that precursor molecular gas must also be present in some physical state which is escaping detection by the usual means (CO(1-0), IR, etc.). We present a model for such a gas in a framework which views the HI as the result of an ongoing ``photodissociation <--> dust grain reformation'' equilibrium in a cold, clumpy molecular medium with a small area filling factor.
Allen Ronald J.
Diaz-Miller Rosa
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