Abstract
Submillimeter continuum observations of six radio-quiet active galactic nuclei selected for high IRAS flux are reported, in order to test models for the infrared continuum by constraining the far-infrared/submillimeter cutoff slope. Slopes greater than the self-absorbed synchrotron cutoff of 2.5 argue against the synchrotron model and lend support to the dust model. The luminous Seyfert 1 galaxy PG 1434+590 is detected at 438 and 345 μm. Combining these detections with the IRAS 100 μm flux gives a slope of 2.53 ± 0.17
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