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astro-ph2002
On The Origin of HI in Galaxies: Photodissociation and the ``Schmidt Law'' for Global Star Formation
Ronald J. Allen
Young stars in the disks of galaxies produce HI from their parent H2 clouds by photodissociation. This process is widespread in late-type galaxies, and follows the distribution of…
astro-ph2002
On The Origin Of HI In Galaxies: The Sizes and Masses of HI Photodissociation Regions
Ronald J. Allen
Young stars in the disks of galaxies produce HI from their parent H2 clouds by photodissociation. This paper describes the observational evidence for and the morphology of such HI.…