Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-27T08:13:06.167Z Has data issue: false hasContentIssue false
  • English
  • Français

Density Bounding of Giant HII Regions and the Ionisation of the Diffuse Interstellar Medium

Published online by Cambridge University Press:  05 March 2013

J. E. Beckman ,
M. Rozas  and
J. H. Knapen
J. E. Beckman*
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna 38200, Spain
M. Rozas
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna 38200, Spain
J. H. Knapen
Affiliation:
Department of Physics, University of Herfordshire, College Lane, Herts. A21D 9AB, UK
*
[email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Three different types of evidence are presented in favour of the hypothesis that the HII regions in disk galaxies with Hα luminosities greater than a critical value of 1038·6 erg s−1 are density-bounded, and that the escaping Lyman continuum photons from these are the principal ionising agents for the diffuse ISM in disk galaxies. This has important implications for the ionisation of the intergalactic medium, and for computed star formation rates in spirals.

Keywords

galaxies:ISMgalaxies: spiralgalaxies: intergalactic mediumISM: HII regions
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 83 - 85
Copyright
Copyright © Astronomical Society of Australia 1998

References

Beckman, J. E., Rozas, M., & Knapen, J. H. 1998, ApJ, (submitted)Google Scholar
Ferguson, A. M., Wyse, R. G., Gallagher, J. S., & Hunter, D. A. 1996, AJ, 111, 2265 Google Scholar
Kennicutt, R. C., Edgar, K., & Hodge, P. W. 1989, ApJ, 337, 761 Google Scholar
McKee, C. F., & Williams, J. P. 1997, ApJ, 476, 144 Google Scholar
Rozas, M., Beckman, J. E., & Knapen, J. H. 1996, A&A, 307, 735 Google Scholar
Rozas, M., Zurita, A., & Beckman, J. E. 1998, PASA, 15, 159 Google Scholar
Sabalisck, N., Rozas, M., & Beckman, J. E. 1998, PASA, 15, 161 Google Scholar
Strömgren, B. 1939, ApJ, 89, 526 Google Scholar
Terlevich, R., & Melnick, J. 1981, MNRAS, 195, 839 Google Scholar