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Limits on Arcminute Scale Cosmic Microwave Background Anisotropy with the BIMA ArrayWe have used the Berkeley-Illinois-Maryland-Association (BIMA) millimeter array outfitted with sensitive cm-wave receivers to search for Cosmic Microwave Background (CMB) anisotropies on arcminute scales. The interferometer was placed in a compact configuration which 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 6.6 arcminutes. We have made sensitive images of seven fields, five of which where chosen specifically to have low IR dust contrast and 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 Q_flat = 5.6 (+3.0, -5.6) uK and Q_flat < 14.1 uK at 68% and 95% confidence. The sensitivity of this experiment to flat band power peaks at a multipole of l = 5470, which corresponds to an angular scale of approximately 2 arcminutes The most likely value of Q_flat is similar to the level of the expected secondary anisotropies.
Document ID
20000083209
Document Type
Preprint (Draft being sent to journal)
Authors
Holzapfel, W. L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Carlstrom, J. E.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Grego, L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Holder, G. P.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Joy, M. K.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Reese, E. D.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Rose, M. Franklin
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Space Radiation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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