Spectrum of the microwave background radiation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Background Radiation, Microwave Spectra, Black Body Radiation, Dicke Radiometers, Statistical Analysis

Scientific paper

A review is given of the present status of measurements of the spectrum of the microwave background. Factors that limit experimental accuracy are discussed with particular reference to high-frequency measurements. A selection of the available measurements yields a data set that is reasonably consistent with the black-body spectrum for a temperature of 2.9 K. A simple statistical analysis suggests either that there are errors in the data set, or that deviations from a black-body spectrum exist. The difficulties inherent in properly averaging the results from different observers are described. Prospects for improved measurements are summarized.

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