Anisotropy in the microwave sky at intermediate angular scales

Details Anisotropy in the microwave sky at intermediate angular scales Anisotropy in the microwave sky at intermediate angular scales

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l..67d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 427, no. 2, p. L67-L70

Astronomy and Astrophysics

Astronomy

56

Anisotropy, Background Radiation, Cosmology, Microwaves, Radio Astronomy, Bolometers, Correlation, Cryogenic Cooling, Error Analysis, Reflecting Telescopes, Temperature

Scientific paper

Observations of a low-background region of sky at high Galactic latitude in a frequency band centered at nu = 90 GHz reveal highly significant detections of anisotropy on intermediate (aprroximately 1 deg) angular scales. The instrument is a 2 x 2 array of bolometric detectors operating at 50 mK, coupled to a 0.75 m off-axis parabolic telescope by single-mode corrugated feedhorns. The FWHM beamwidth of the instrument is 0.75 deg, with a beamswitch of +/- 2.75 deg on the sky. Interpreting the detected fluctuations as due to anisotropy in the cosmic microwave background, a likelihood analysis assuming a Gaussian correlation function in the temperature fluctuations yields most likely values of (delta T)/T of 3.1-0.9+2.5 x 10-5 and 3.8-1.2+2.9 x 10-5 at a coherence angle of 1.0 deg, for the left- and right-hand detectors, respectively. The stated errors are 95% confidence limits. Confirmation at other frequencies is required to rule out the possibility of foreground contamination.

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