Dust absorption in the Lyman continuum

Details Dust absorption in the Lyman continuum Dust absorption in the Lyman continuum

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....38..129k&link_type=abstract

Astronomy and Astrophysics, vol. 38, no. 1, Jan. 1975, p. 129-132.

Astronomy and Astrophysics

Astrophysics

3

Absorption Spectra, Continuous Spectra, Cosmic Dust, Interstellar Extinction, Interstellar Gas, Lyman Spectra, Absorptivity, Atmospheric Models, Atomic Recombination, Density Distribution, Gas Temperature, H Ii Regions, H Lines, Helium Ions, Ionizing Radiation, Luminous Intensity

Scientific paper

Models of H II regions containing dust and helium are calculated for a variety of density distributions, exciting objects, dust absorption coefficients for the He and H ionizing photons, and gas temperatures. The relation between the emitted Lyman continuum flux and the ratio of the volume of the He(+) region to that of the H(+) region is computed. It is shown that for a Lyman continuum flux in excess of 10 to the 52nd photons/s, the He recombination lines should be much weaker than the H lines. The calculations indicate a sharp relation between the volumes ratio and the infrared excess, which is defined as the factor by which the total IR luminosity exceeds the energy contributed by the L-alpha photons alone. The effects of higher gas temperatures, due to an underabundance of cooling ions, are briefly discussed.

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