Near-millimeter spectrum of the microwave background

Details Near-millimeter spectrum of the microwave background Near-millimeter spectrum of the microwave background

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248...18w&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 18-37. NASA-supported research;

Astronomy and Astrophysics

Astrophysics

62

Background Radiation, Balloon-Borne Instruments, Emission Spectra, Microwave Spectra, Millimeter Waves, Relic Radiation, Black Body Radiation, Cryogenic Equipment, Data Reduction, Signal To Noise Ratios, Sky Radiation, Spectrophotometers

Scientific paper

A description is given of a method for the measurement of the cosmic microwave background (CMB) spectrum. A helium-cooled, balloon-borne spectrophotometer was used to measure the emission spectrum of the night sky over the frequency range 1.7-40/cm. The apparatus was calibrated using a blackbody source at a variety of temperatures both before and after the flight. It is shown that the spectrum of the CMB peaks at 6/cm and is approximately that of a blackbody out to several times that frequency. The measured flux is also found to be equivalent to that from a blackbody in the temperature range from 2.88 to 3.09 K. The data set resulting from the combination of these measurements with previous observations of the CMB covers three decades in frequency, and is compared with various CMB models.

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