2001/06/28 by Akio K. Inoue · 74 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Extinction (optical mineralogy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Infrared #Ionization #Luminous infrared galaxy #Metallicity #Spiral galaxy #Star formation #astro-ph
paper · pdf · doi:10.1086/323095
published in The Astronomical Journal 122(4), 1788-1795 (Institute of Physics) · Accepted by Astronomical Journal. 17 pages, 5 figures
arxiv created 2001/06/28 · openalex publication_date 2001/10/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.