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MAXIPOL: Data Analysis and Results

Abstract : We present results from and the analysis of data from MAXIPOL, a balloon-borne experiment designed to measure the polarization in the Cosmic Microwave Background (CMB). MAXIPOL is the first CMB experiment to obtain results using a rotating half-wave plate as a rapid polarization modulator. We report results from observations of a sky area of 8 deg^2 with 10-arcmin resolution, providing information up to l~700. We use a maximum-likelihood method to estimate maps of the Q and U Stokes parameters from the demodulated time streams, and then both Bayesian and frequentist approaches to compute the EE, EB, and BB power spectra. Detailed formalisms of the analyses are given. A variety of tests show no evidence for systematic errors. The Bayesian analysis gives weak evidence for an EE signal. The EE power is 55^{+51}_{-45} \mu K^2 at the 68% confidence level for l=151-693. Its likelihood function is asymmetric and skewed positive such that with a uniform prior the probability of a positive EE power is 96%. The powers of EB and BB signals at the 68% confidence level are 18^{+27}_{-34} \mu K^2 and -31^{+31}_{-19} \mu K^2 respectively and thus consistent with zero. The upper limit of the BB-mode at the 95% confidence level is 9.5 \mu K. Results from the frequentist approach are in agreement within statistical errors. These results are consistent with the current concordance LCDM model.
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Contributor : Simone Lantz <>
Submitted on : Friday, March 23, 2007 - 4:21:15 PM
Last modification on : Saturday, September 19, 2020 - 4:53:17 AM

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J. H. P. Wu, J. Zuntz, M. E. Abroe, P. A. R. Ade, J. Bock, et al.. MAXIPOL: Data Analysis and Results. The Astrophysical Journal, American Astronomical Society, 2007, 665, pp.55-66. ⟨10.1086/518112⟩. ⟨in2p3-00138184⟩



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