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Bayesian Power Spectrum Analysis of the First-Year WMAP data | | I.J. O’Dwyer
; H.K. Eriksen
; B.D. Wandelt
; J.B. Jewell
; D.L. Larson
; K. M. Gorski
; A.J. Banday
; S. Levin
; P.B. Lilje
; | | Date: |
1 Jul 2004 | | Journal: | Astrophys.J. 617 (2004) L99-102 | | Subject: | astro-ph | | Abstract: | We present the first results from a Bayesian analysis of the WMAP first year data using a Gibbs sampling technique. Using two independent, parallel supercomputer codes we analyze the WMAP Q, V and W bands. The analysis results in a full probabilistic description of the information the WMAP data set contains about the power spectrum and the all-sky map of the cosmic microwave background anisotropies. We present the complete probability distributions for each C_l including any non-Gaussianities of the power spectrum likelihood. While we find good overall agreement with the previously published WMAP spectrum, our analysis uncovers discrepancies in the power spectrum estimates at low l multipoles. For example we claim the best-fit Lambda-CDM model is consistent with the C_2 inferred from our combined Q+V+W analysis with a 10% probability of an even larger theoretical C_2. Based on our exact analysis we can therefore attribute the "low quadrupole issue" to a statistical fluctuation. | | Source: | arXiv, astro-ph/0407027 | | Services: | Forum | Review | PDF | Favorites | |
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