Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281...63l&link_type=abstract
The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb
Physics
Scientific paper
Normal galaxies, like star-forming galaxies, will make some contribution to the extragalactic background of Lyman continuum photons at low redshifts if a few percent of these ultraviolet photons escape. Therefore galaxies will play some role in ionizing the gas around them and in the intergalactic medium, and ths gas will be exposed to varying amounts of ionizing radiation depending upon the local galactic environment. The ionizing background can be recalculated at any point within a simulation by adding the flux from the galaxies to a uniform quasar contribution. At redshift zero normal galaxies are found to always make some contribution >~ 10 percent to the calculated ionization rate, and the ionization rate is most often seen to be around 1.4 times the assumed quasar contribution. Ly-alpha absorbers with a wide range of neutral column densities are found to be exposed to a wide range of ionization rates. On average, less highly ionized absorbers are found to arise further from luminous galaxies, although many local fluctuations in the ionization rate are seen around galaxies having a wide range of properties.
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