DASI THREE-YEAR COSMIC MICROWAVE BACKGROUND POLARIZATION RESULTS

• Main Authors: E. M. Leitch, J. M. Kovac, N. W. Halverson, J. E. Carlstrom, C. Pryke, M. W. E. Smith
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2004
• Subjects: Amundsen-Scott; Austral; South Pole; South pole
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.256.712; http://arxiv.org/pdf/astro-ph/0409357v1.pdf

We present the analysis of the complete 3-year data set obtained with the Degree Angular Scale Interferometer (DASI) polarization experiment, operating from the Amundsen-Scott South Pole research station. Additional data obtained at the end of the 2002 Austral winter and throughout the 2003 season were added to the data from which the first detection of polarization of the cosmic microwave background radiation was reported. The analysis of the combined data supports, with increased statistical power, all of the conclusions drawn from the initial data set. In particular, the detection of E-mode polarization is increased to 6.3σ confidence level, TE cross-polarization is detected at 2.9σ, and B-mode polarization is consistent with zero, with an upper limit well below the level of the detected E-mode polarization. The results are in excellent agreement with the predictions of the cosmological model that has emerged from CMB temperature measurements. The analysis also demonstrates that contamination of the data by known sources of foreground emission is insignificant. Subject headings: cosmic microwave background — cosmology:observations — techniques:interferometric — techniques:polarimetric 1. introduction The use of the cosmic microwave background (CMB) as a precision probe of the composition and dynamics of the universe presumes the correctness of the theoretical framework by which we understand its origin and evolution. With the detections of CMB polarization anisotropy by