Large far-infrared (45-750 M) fluxes have been measured from eight sources associated with galactic H ii regions. The far-infrared objects are coincident with the thermal radio sources DR 21, K3-50, M17, M42, NGC 2024, W49, and W51. An upper limit was also obtained for the planetary nebula NGC 7027. The far-infrared luminosities of the sources range from 2 X 10 to 2 X 10 La Measurements of M17, M42, NGC 2024, W49, and W51 indicate that the sources are extended, are optically thin, and have temperatures in the range K.
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Harper et al. (1971) studied this question.