Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-15
Astrophys.J. 609 (2004) 498-512
Astronomy and Astrophysics
Astrophysics
16 pages including 14 color figures; accepted by ApJ. v2: new parameter analysis including latest VSA
Scientific paper
10.1086/421105
Two years of microwave background observations with the Cosmic Background Imager (CBI) have been combined to give a sensitive, high resolution angular power spectrum over the range 400 < l < 3500. This power spectrum has been referenced to a more accurate overall calibration derived from WMAP. The data cover 90 deg^2 including three pointings targeted for deep observations. The uncertainty on the l > 2000 power previously seen with the CBI is reduced. Under the assumption that any signal in excess of the primary anisotropy is due to a secondary Sunyaev-Zeldovich anisotropy in distant galaxy clusters we use CBI, ACBAR, and BIMA data to place a constraint on the present-day rms mass fluctuation sigma_8. We present the results of a cosmological parameter analysis on the l < 2000 primary anisotropy data which show significant improvements in the parameters as compared to WMAP alone, and we explore the role of the small-scale cosmic microwave background data in breaking parameter degeneracies.
Altamirano Pablo
Bond Richard J.
Bronfman Leonard
Bustos Ricardo
Cartwright John K.
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