Abstract

The possibility of detectable extragalactic radio recombination lines is explored. Stimulated recombination lines may be detectable from the nuclei of active galaxies and quasars at the mJy level. The major uncertainty concerns the geometry of the nuclear emission-line region - its size and homogeneity. Low-frequency recombination lines may also be detectable from optical absorption-line regions in the directions of distant radio sources.

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