Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..191r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 1, 1984, p. 191-196.
Astronomy and Astrophysics
Astrophysics
192
Hydrogen Clouds, Hydrogen Recombinations, Interstellar Matter, Ion Production Rates, Nebulae, Background Radiation, Galactic Radiation, Gas Ionization, H Alpha Line, Lyman Spectra
Scientific paper
The results of an analysis of H-alpha emission in the diffuse interstellar medium are reported. The analysis is performed on the basis of Fabry-Perot spectrometer observations of H-alpha emission covering a 160 km/s radial velocity interval. It is found that the intensity of the galactic H-alpha background at high galactic latitudes implies an average hydrogen recombination rate of 4 x 10 to the 6th per sec/sq cm of galactic disk for the region within 2 to 3 kpc from the sun. This rate eliminates some possible sources of the ionization for the diffuse interstellar medium. O-type stars and perhaps planetary nebula are the only known sources of ionizing radiation with Lyman continuum fluxes equal to or greater than the hydrogen recombination rate.
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