Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..102k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, May 20, 1990, p. 102-113.
Astronomy and Astrophysics
Astrophysics
21
Radiation Measurement, Relic Radiation, Antenna Radiation Patterns, Calibrating, Microwave Radiometers
Scientific paper
The intensity of the cosmic microwave background (CMB) at a frequency of 7.5 GHz (wavelength 4.0 cm) was measured using a ground-based, total power radiometer calibrated at the antenna aperture by an external cryogenic reference target. The radiometer measured the atmospheric antenna temperature by correlating the signal change with the air mass in the beam during tip scans. The small galactic signal was subtracted based on extrapolation from lower frequencies and was checked by differential drift scans. The limiting uncertainty in the CMB measurement was the effect of ground radiation in the antenna sidelobes during atmospheric measurements. The thermodynamic temperature of the CMB at 7.5 GHz is 2.60 + or - 0.07 K (68 percent confidence level).
Bensadoun Marc
de Amici Giovanni
Kogut Alan
Levin Sergey
Smoot George F.
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