Lyman continuum extinction by dust in H II regions of galaxies

Akio K. Inoue*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


We examine Lyman continuum extinction (LCE) in H II regions by comparing infrared fluxes of 49 H II regions in the Galaxy, M31, M33, and the Large Megellanic Cloud with estimated production rates of Lyman continuum photons. A typical fraction of Lyman continuum photons that contribute to hydrogen ionization in the H II regions of three spiral galaxies is ≲50%. The fraction may become smaller as the metallicity (or dust-to-gas ratio) increases. We examine the LCE effect on estimated star formation rates of galaxies. The correction factor for the Galactic dust-to-gas ratio is 2-5.

Original languageEnglish
Pages (from-to)1788-1795
Number of pages8
JournalAstronomical Journal
Issue number4
Publication statusPublished - 2001 Oct
Externally publishedYes


  • Dust, extinction
  • Galaxies: ISM
  • H II regions
  • Infrared radiation
  • Radio continuum
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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