Abstract
The radio and infrared spectrum of DR 21 is established over a wide range of frequencies (from 102 to 108 MHz). Two physical processes, free-free emission from the ionized hydrogen at radio wavelengths and reradiation at infrared wavelengths of the original stellar ultraviolet radiation by dust grains have to be considered in the explanation of the derived spectrum. Physical parameters of the object deduced from its radio emission are also presented.
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Goudis, C. The radio and infrared spectrum of DR 21. Astrophys Space Sci 39, L1–L6 (1976). https://doi.org/10.1007/BF00640526
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DOI: https://doi.org/10.1007/BF00640526