NASA NTRS · 19730045206
A search for H alpha emission from interstellar clouds.
Abstract
Upper limits have been determined for the emission measures of five interstellar clouds. These limits are significantly smaller than the emission measures predicted by a recent model in which the variation in the column-density ratio Na/Ca(+) among interstellar clouds is attributed to differences in the temperature, density, and hydrogen ionization fraction of the clouds.
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Reynolds, R. J., Roesler, F. L., Scherb, F.. 1973-04-15. A search for H alpha emission from interstellar clouds.. https://ntrs.nasa.gov/citations/19730045206
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