A medium-scale measurement of the cosmic microwave background at 3.3 millimeters

Details A medium-scale measurement of the cosmic microwave background at 3.3 millimeters A medium-scale measurement of the cosmic microwave background at 3.3 millimeters

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l..11m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, March 20, 1991, p. L11-L14. Research supported by University

Astronomy and Astrophysics

Astrophysics

83

Galactic Evolution, Radiation Measurement, Relic Radiation, Astronomical Models, Cosmic Dust, Emission Spectra, Spatial Distribution

Scientific paper

A system has been developed for making measurements of spatial fluctuations in the cosmic microwave background radiation, on an angular scale of 5 arcmin to a few degrees. The system consists of an off-axis Gregorian telescope with a nearly Gaussian response with FWHM adjustable from 20 to 50 arcmin, an SIS coherent receiver operating at 3.3 mm, and a pointing system capable of better than 1 arcmin rms stabilization. This paper reports on results from the system's first balloon flight in August 1988, and ground-based measurements made from the South Pole in December 1988. A portion of the South Pole data is used to place a 95-percent confidence level upper limit of Delta T/T less than 0.000035 for Gaussian sky fluctuations in the background radiation at 20-arcmin angular scale and a limit of Delta T/T less than 0.000033 on overall excess intrinsic sky noise. In addition, dust contamination in cosmic background radiation data is estimated using measurements of the Galaxy from this flight and a previous one, along with the IRAS 100-micron map. These anisotropy results give the most stringent limits on cold dark matter theories to date.

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