Why Many Infrared Astronomical Sources emit at 100 µm

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RECENT far infrared observations indicate that three general features characterize many galactic sources: (1) the flux at 100 µm is far greater than at the shorter 20 µm, 10 µm and 5 µm wavelengths1 (Fig. 1); (2) at the shorter wavelengths sources appear more compact, and (3) there is a rough proportionality between the total infrared luminosity and the intensity of the thermal radio emission from these sources2.

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