M. Rozas , A. Zurita , J. E. Beckman, PASA, 15 (1), 159
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Next Section: Observations
QUANTIFYING THE IONIZING FLUX ESCAPING FROM THE ULTRA-LUMINOUS H II REGIONS IN FOUR SPIRAL GALAXIES
M. Rozas 
A. Zurita
J. E. Beckman
Instituto de Astrofísica de Canarias, La Laguna, Spain, 38200
mrozas, azurita, jeb@ll.iac.es
Abstract:
There are two principal problems in explaining, in terms of the emission from OB stars, the ionization of the gas which emits the diffuse H
in spiral galaxies. One is the long path lengths which the ionizing photons need to traverse to reach their objectives, the other is whether sufficient photons can escape from within the H II regions which surround the hot stars. Here we treat the second point, assuming that the H II regions above a certain threshold luminosity are density bounded. We calculate the escaping Lyman continuum (Lyc) fluxes from the density bounded regions in four galaxies, and show that in each of them this is easily sufficient to produce the measured diffuse H emission.
Keywords: galaxies: ISM, galaxies: spiral, ISM: H II regions
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