Anisotropy in the microwave sky at intermediate angular scales

M. Dragovan*, J. E. Ruhl, G. Novak, S. R. Platt, B. Crone, R. Pernic, J. B. Peterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


Observations of a low-background region of sky at high Galactic latitude in a frequency band centered at ν = 90 GHz reveal highly significant detections of anisotropy on intermediate (∼1°) angular scales. The instrument is a 2 × 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, with a beamswitch of ±2.°75 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 ΔT/T of 3.1-0.9+2.5 × 10-5 and 3.8-1.2+2.9 × 10-5 at a coherence angle of 1.°0, 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.

Original languageEnglish (US)
Pages (from-to)L67-L70
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - Jun 1 1994


  • Cosmic microwave background
  • Cosmology: observations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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