Extended Mosaic Observations with the Cosmic Background Imager
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0402359,
title = {Extended Mosaic Observations with the Cosmic Background Imager},
author = {A. C. S. Readhead and B. S. Mason and C. R. Contaldi and T. J. Pearson and J. R. Bond and S. T. Myers and S. Padin and J. L. Sievers and J. K. Cartwright and M. C. Shepherd and D. Pogosyan and S. Prunet and P. Altamirano and R. Bustos and L. Bronfman and S. Casassus and W. L. Holzapfel and J. May and U. -L. Pen and S. Torres and P. S. Udomprasert},
journal= {arXiv preprint arXiv:astro-ph/0402359},
year = {2009}
}
Comments
16 pages including 14 color figures; accepted by ApJ. v2: new parameter analysis including latest VSA