The ionization equilibrium of iron in H II regions

Details The ionization equilibrium of iron in H II regions The ionization equilibrium of iron in H II regions

2003-12-09

arxiv.org/abs/astro-ph/0312246v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, extended version of the paper to be published in "Recycling intergalactic and interstellar matter", IAU Sym

Scientific paper

We study the ionization equilibrium of Fe using photoionization models that incorporate improved values for the ionization and recombination cross-sections and the charge-exchange rates for the Fe ions. The previously available photoionization models predict concentrations of Fe3+ which are a factor of 3-8 higher than the values inferred from emission lines of [Fe III] and [Fe IV]. Our new models reduce these discrepancies to factors of 2-5. We discuss the possible reasons behind the remaining discrepancies and present an updated ionization correction factor for obtaining the Fe abundance from the Fe++ abundance.

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