44. What are radio recombination ratios?
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Radio recombination lines are spectral lines that result from the recombination of a free electron with an ion. These lines are typically observed in the radio frequency range and are important for studying the properties of ionized gas in the interstellar medium.
The radio recombination ratio (RRR) is a measure of the intensity of a radio recombination line relative to the continuum emission at the same frequency. Specifically, the RRR is defined as the ratio of the line intensity to the continuum intensity, both measured at the same frequency.
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