Journal
ASTRONOMICAL JOURNAL
Volume 122, Issue 4, Pages 1788-1795Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/323095
Keywords
dust, extinction; galaxies : ISM; HII regions; infrared radiation; radio continuum; stars : formation
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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 less than or similar to 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.
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