Low-Frequency Measurement of the Spectrum of the Cosmic Background Radiation

Phys. Rev. Lett. 51, 1099 – Published 19 September 1983
George F. Smoot, Giovanni De Amici, Scott D. Friedman, Chris Witebsky, Nazzareno Mandolesi, R. Bruce Partridge, Giorgio Sironi, Luigi Danese, and Gianfranco De Zotti


Measurements have been made of the cosmic-background-radiation spectrum at five wavelengths (0.33, 0.9, 3, 6.3, and 12 cm) with use of radiometers with wavelength-scaled corrugated-horn antennas having very low sidelobes. A single large-mouth (0.7-m-diam) liquid-helium-cooled absolute reference load was used for all five radiometers. The results of the observations are consistent with previous measurements and represent a significant improvement in accuracy at low frequencies.

DOI: http://dx.doi.org/10.1103/PhysRevLett.51.1099

  • Received 25 May 1983
  • Published in the issue dated 19 September 1983

© 1983 The American Physical Society

Authors & Affiliations

George F. Smoot, Giovanni De Amici, Scott D. Friedman, and Chris Witebsky

  • Space Sciences Laboratory and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

Nazzareno Mandolesi

  • Istituto Tecnologie e Studio delle Radiazioni Extraterrestri-Consiglio Nazionale delle Richerche, Bologna, Italy

R. Bruce Partridge

  • Haverford College, Haverford, Pennsylvania 19041

Giorgio Sironi

  • Istituto di Fisica Cosmica-Consiglio Nazionale delle Richerche, Milano, Italy

Luigi Danese and Gianfranco De Zotti

  • Osservatorio Astronomico, University of Padova, Padova, Italy

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