James J. Condon coauthored Essential Radio Astronomy by James J. Condon and Scott M. Ransom with Scott M. Ransom. The text develops the connection between physical radiation mechanisms and the measurements made by radio telescopes.
Its treatment of free-free emission connects the electron temperature, emission measure and optical depth to the observed radio signal. This is useful because an astronomical radio image records radiation after both its production and its passage through intervening material; interpreting brightness requires both parts of that model.[ref]
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