A measurement of the large-scale cosmic microwave background anisotropy at 1.8 millimeter wavelength

Details A measurement of the large-scale cosmic microwave background anisotropy at 1.8 millimeter wavelength A measurement of the large-scale cosmic microwave background anisotropy at 1.8 millimeter wavelength

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l...7m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 10, 1991, p. L7-L9.

Astronomy and Astrophysics

Astrophysics

64

Anisotropy, Background Radiation, Cosmic Rays, Cosmology, Microwaves, Bolometers, Microwave Radiometers, Milky Way Galaxy, Radiation Measurement

Scientific paper

This measurement of the large-scale cosmic microwave background radiation (CMBR) anisotropy places the most stringent constraints to date on fluctuations in the CMBR on angular scales greater than about 4 deg. Using a four-channel bolometric radiometer operating at 1.8, 1.1, 0.63, and 0.44 mm, the diffuse sky brightness over half of the northern hemisphere has been mapped with an angular resolution of 3.8 deg. Analysis of the sky map at the longest wavelength for Galactic latitudes of 15 deg or more yields a 95-percent confidence level upper limit on fluctuations of the CMBR at Delta T/T of 1.6 x 10 to the -5th with a statistical power of 92 percent for Gaussian fluctuations at a correlation angle of 13 deg. Between 3 deg and 22 deg, the upper limit of fluctuations is 4.0 x 10 to the -5th . An anisotropy is detected in the map, but it cannot yet be attributed to primordial sources. The ultimate sensitivity for this experiment is 7 x 10 to the -6th over this angular range for Gaussian fluctuations.

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