Abstract
Measurements have been made at 85 GHz of 12 objects identified by Hoffman, Frederick, and Emery as sources of 100- mu emission in excess of 10/sup -22/ W cm/sup -2/ Hz/sup -1/. In an attempt to detect the lo ngwavelength tail of the far-infrared spectral component, the observed 3.5-mm flux densities for each of the sources are compared with that expected from an extrapolation of the radio spectrum from lower frequencies: No unequivocal evidence is found for the presence of any contribution to the 85-GHz flux attributable to the presence of a high-frequency component. This result not only restricts a large class of models in which the 100- mu emission arises from nonthermal processes but it also requires that if the infrared radiation is due to thermal emission from dust grains then the temperature of those grains must exceed 20 deg K. Finally a plot of 100- mu fiux density versus 3.5-mm flux density suggests a separation of the sources into two classes that may be quite distinct. (auth)
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