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Anisotropy in the microwave sky at intermediate angular scalesObservations 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(sub -0.9)(sup +2.5) x 10(exp -5) and 3.8(sub -1.2)(sup +2.9) x 10(exp -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.
Document ID
19950052399
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dragovan, M.
(Princeton University Princeton, NJ, United States)
Ruhl, J. E.
(Princeton University Princeton, NJ, United States)
Novak, G.
(Princeton University Princeton, NJ, United States)
Platt, S. R.
(Princeton University Princeton, NJ, United States)
Crone, B.
(Princeton University Princeton, NJ, United States)
Pernic, R.
(University of Chicago, Williams Bay, WI United States)
Peterson, J. B.
(Princeton University Princeton, NJ, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 427
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A83998
Funding Number(s)
CONTRACT_GRANT: NSF AST-90-57089
CONTRACT_GRANT: NSF DPP-89-20223
CONTRACT_GRANT: NGT-50622
Distribution Limits
Public
Copyright
Other

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