The submillimeter spectrum of the cosmic background radiation

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Abstract

The diffuse brightness of the sky has been measured in six submillimeter passbands, using a rocket-borne, liquid helium-cooled, absolute radiometer. The flux measured at 1160 microns (8.6 cm^-1^) is in good agreement with the average of longer wavelength measurements of the temperature of the cosmic background radiation. The fluxes measured at 709 microns and 481 microns (14 and 21 cm^-1^) show a rapid decrease toward shorter wavelength, but correspond to significantly higher temperatures. No local source of this excess flux has been identified. The spectrum of the excess significantly constrains cosmological models. Data at 262, 137, and 102 microns (38, 73, and 98 cm^-1^) are consistent with emission from interstellar dust.

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