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forbidden line

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forbidden line

In astronomy, emission line seen in the spectra of certain astronomical objects that are not visible under the conditions prevailing in laboratory experiments. They indicate that the hot gas emitting them is at extremely low density. Forbidden lines are seen, for example, in the tenuous gas of the Sun's corona, in HII regions (regions of hot, ionized hydrogen), and in the centres of certain active galaxies.
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Religious leaders cross a forbidden line when they use church resources to intervene in a partisan election or distribute a candidate's campaign literature.
Churches and partisan politics: a bad mix by Boston, Rob / The Humanist
The tables are arranged in order of decreasing wavelengths, and they include so-called forbidden lines, which are very important for plasma diagnostic applications.
NEW NIST MONOGRAPH OF SPECTRAL DATA FOR HIGHLY IONIZED ATOMS by Journal of Research of the National Institute of Standards and Technology
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