Abstract
Radio recombination lines are known to be observable at positions along the galactic ridge which are free of discrete continuum sources. Based on the results of a recent survey of H272α lines it is shown that most of the observed galactic ridge recombination lines can be explained as emission from outer low-density envelopes of normal Hn regions. The distribution of low-density ionized gas and discrete HII regions as a function of the distance from the galactic centre is also derived.
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Anantharamaiah, K.R. On the origin of the galactic ridge recombination lines. J Astrophys Astron 7, 131–139 (1986). https://doi.org/10.1007/BF02714206
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DOI: https://doi.org/10.1007/BF02714206