DENSITY BOUNDING OF GIANT HII-REGIONS AND THE IONIZATION OF THE DIFFUSE INTERSTELLAR-MEDIUM

Authors
BECKMAN JE ROZAS M KNAPEN JH
Citation
Je. Beckman et al., DENSITY BOUNDING OF GIANT HII-REGIONS AND THE IONIZATION OF THE DIFFUSE INTERSTELLAR-MEDIUM, Publications of the Astronomical Society of Australia, 15(1), 1998, pp. 83-85
Citations number
9
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of Australia → ACNP
ISSN journal
13233580
Volume
15
Issue
1
Year of publication
1998
Pages
83 - 85
Database
ISI
SICI code
1323-3580(1998)15:1<83:DBOGHA>2.0.ZU;2-N
Abstract
Three different types of evidence are presented in favour of the hypot hesis that the HII regions in disk galaxies with Her luminosities grea ter than a critical value of 10(38.6) erg s(-1) are density-bounded, a nd that the escaping Lyman continuum photons from these are the princi pal ionising agents for the diffuse ISM in disk galaxies. This has imp ortant implications for the ionisation of the intergalactic medium, an d for computed star formation rates in spirals.