Ionization and the Varying HI Mass Function

Details Ionization and the Varying HI Mass Function Ionization and the Varying HI Mass Function

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..761..445l&link_type=abstract

THE SPECTRAL ENERGY DISTRIBUTIONS OF GAS-RICH GALAXIES: Confronting Models with Data; International Workshop. AIP Conference Pr

Physics

Normal Galaxies, Extragalactic Objects And Systems, Hi Regions And 21-Cm Lines, Diffuse, Translucent, And High-Velocity Clouds

Scientific paper

If a few percent of ionizing ultraviolet photons escape from galaxies, then normal galaxies make a modest (30 to 40 percent) and spatially varying contribution to the ionizing background at low redshift (Linder et al.). Supposing that galaxies form with some total (neutral plus ionized) mass function, then the slope of the HI mass function will be less steep than the slope of the total mass function if a larger fraction of the gas in low mass galaxies becomes ionized by an ultraviolet background. If the ionizing background varies with galactic environment, then the HI mass function will also vary.

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