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A Preliminary Detection of Arcminute Scale Cosmic Microwave Background Anisotropy with the BIMA ArrayWe have used the Berkeley-Illinois-Maryland-Association (BIMA) array outfitted with sensitive cm-wave receivers to expand our search for minute scale anisotropy of the Cosmic Microwave Background (CMB). The interferometer was placed in a compact configuration to obtain high brightness sensitivity on arcminute scales over its 6.6' FWHM field of view. The sensitivity of this experiment to flat band power peaks at a multipole of 1 = 5530 which corresponds to an angular scale of -2'. We present the analysis of a total of 470 hours of on-source integration time on eleven independent fields which were selected based on their low IR contrast and lack of bright radio sources. Applying a Bayesian analysis to the visibility data, we find CMB anisotropy flat band power Q_flat = 6.1(+2.8/-4.8) microKelvin at 68% confidence. The confidence of a nonzero signal is 76% and we find an upper limit of Q_flat < 12.4 microKelvin at 95% confidence. We have supplemented our BIMA observations with concurrent observations at 4.8 GHz with the VLA to search for and remove point sources. We find the point sources make an insignificant contribution to the observed anisotropy.
Document ID
20010020220
Document Type
Preprint (Draft being sent to journal)
Authors
Dawson, K. S.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Holzapfel, W. L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Carlstrom, J. E.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Joy, M.
(NASA Marshall Space Flight Center Huntsville, AL United States)
LaRoque, S. J.
(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 20, 2013
Publication Date
January 1, 2001
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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