DENSITY BOUNDING OF GIANT H II REGIONS AND THE IONIZATION OF THE DIFFUSE INTERSTELLAR MEDIUM

J. E. Beckman , M. Rozas , J. H. Knapen, PASA, 15 (1), 83
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DENSITY BOUNDING OF GIANT H II REGIONS AND THE IONIZATION OF THE DIFFUSE INTERSTELLAR MEDIUM

J. E. Beckman tex2html_wrap_inline137
M. Rozas tex2html_wrap_inline137
J. H. Knapen tex2html_wrap_inline141

tex2html_wrap_inline137Instituto de Astrofísica de Canarias, La Laguna, Spain, 38200
jeb, mrozas@ll.iac.es
tex2html_wrap_inline141University of Herfordshire, Hatfield, U.K.
knapen@star.herts.ac.uk

Abstract:

Three different types of evidence are presented in favour of the hypothesis that the H II regions in disc galaxies with Htex2html_wrap_inline151 luminosities greater than a critical value: 10tex2html_wrap_inline153 erg stex2html_wrap_inline155, are density bounded, and that the escaping Lyman continuum photons from these are the principal ionizing agents for the diffuse ISM in disc galaxies. This has important implications for the ionization of the intergalactic medium, and for computed star formation rates in spirals.

Keywords: galaxies: ISM, galaxies: spiral, galaxies: intergalactic medium, ISM: H II regions


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