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Limits on Arcminute-Scale Cosmic Microwave Background Anisotropy at 28.5 GHzWe have used the Berkeley-Illinois-Maryland Association (BIMA) millimeter array outfitted with sensitive centimeter-wave receivers to search for cosmic microwave background (CMB) anisotropies on arcminute scales. The interferometer was placed in a compact configuration that produces high brightness sensitivity, while providing discrimination against point sources. Operating at a frequency of 28.5 GHz, the FWHM primary beam of the instrument is approximately 6'.6. We have made sensitive images of seven fields, four of which where chosen specifically to have low infrared dust contrast and to be free of bright radio sources. Additional observations with the Owens Valley Radio Observatory (OVRO) millimeter array were used to assist in the location and removal of radio point sources. Applying a Bayesian analysis to the raw visibility data, we place limits on CMB anisotropy flat-band power of Q(sub flat) = 5.6(sub -5.6)(exp 3.0) microK and Q(sub flat) < 14.1 microK at 68% and 95% confidence, respectively. The sensitivity of this experiment to flat-band power peaks at a multipole of I = 5470, which corresponds to an angular scale of approximately 2'. The most likely value of Q(sub flat) is similar to the level of the expected secondary anisotropies.
Document ID
20010068923
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Holzapfel, W. L.
(California Univ. Berkeley, CA United States)
Carlstrom, J. E.
(Chicago Univ. Chicago, IL United States)
Grego, L.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Holder, G.
(Chicago Univ. Chicago, IL United States)
Joy, M.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Reese, E. D.
(Chicago Univ. Chicago, IL United States)
Date Acquired
August 20, 2013
Publication Date
August 10, 2000
Publication Information
Publication: Astrophysical Journal
Volume: 539
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: NSF AST 96-13998
CONTRACT_GRANT: NSF AST-96-13717
CONTRACT_GRANT: NAG5-7986
Distribution Limits
Public
Copyright
Other
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