Low Frequency Recombination Lines
Low frequency recombination lines will be defined for the purpose of this paper, to be those transitions with frequencies significantly less than 1 GHz. Most radio recombination line observations have been carried out at high frequencies, as not only can higher angular resolution be obtained, but also the signal-to-noise ratio is higher for small diameter, high emission measure objects and there are less problems with the optical depth of the free-free emission.
KeywordsElectron Temperature Optical Depth Galactic Centre Recombination Line Hydrogen Line
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