Leaky H II Regions and Helium Ionization in the Reynolds Layer

Details Leaky H II Regions and Helium Ionization in the Reynolds Layer Leaky H II Regions and Helium Ionization in the Reynolds Layer

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..315...83w&link_type=abstract

How Does the Galaxy Work? A Galactic Tertulia with Don Cox and Ron Reynolds. Edited by Emilio J. Alfaro, Instituto de Astrofisic

Astronomy and Astrophysics

Astrophysics

Scientific paper

In the Milky Way's diffuse ionized gas, helium is observed to be underionized relative to hydrogen, implying ionization by a softer radiation field than typical of H ii regions. We construct 3D photoionization models of the diffuse ionized gas and show that the ionizing spectra escaping from leaky H ii regions can provide a solution to the He+/H+ problem. Depending on the spectral type of the ionizing source(s) and the fractional leakage from the H ii region, we find that leaky spectra are harder and have their He-ionizing photon luminosity supressed. Such spectra yield a reduced He+/H+ fraction and increased heating compared to normal stellar spectra.

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