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First‐Year Wilkinson Microwave Anisotropy Probe(WMAP) Observations: Parameter Estimation Methodology

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Verde, L., Peiris, H. V., Spergel, D. N., Nolta, M. R., Bennett, C. L., Halpern, M., Hinshaw, G., Jarosik, N., Kogut, A., Limon, M., Meyer, S. S., Page, L., Tucker, G. S., Wollack, E., Wright, E. L.·2003·The Astrophysical Journal Supplement Series

Abstract

We describe our methodology for comparing the Wilkinson Microwave Anisotropy Probe ( WMAP ) measurements of the cosmic microwave background (CMB) and other complementary data sets to theoretical models. The unprecedented quality of the WMAP data and the tight constraints on cosmological parameters that are derived require a rigorous analysis so that the approximations made in the modeling do not lead to significant biases. We describe our use of the likelihood function to characterize the statistical properties of the microwave background sky. We outline the use of the Monte Carlo Markov Chains to explore the likelihood of the data given a model to determine the best-fit cosmological parameters and their uncertainties. We add to the WMAP data the ℓ ≳ 700 Cosmic Background Imager (CBI) and Arcminute Cosmology Bolometer Array Receiver (ACBAR) measurements of the CMB, the galaxy power spectrum at z ∼ 0 obtained from the Two-Degree Field Galaxy Redshift Survey (2dFGRS), and the matter power spectrum at z ∼ 3 as measured with the Lyα forest. These last two data sets complement the CMB measurements by probing the matter power spectrum of the nearby universe. Combining CMB and 2dFGRS requires that we include in our analysis a model for galaxy bias, redshift distortions, and the nonlinear growth of structure. We show how the statistical and systematic uncertainties in the model and the data are propagated through the full analysis.

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Metadata

Authors
Verde, L., Peiris, H. V., Spergel, D. N., Nolta, M. R., Bennett, C. L., Halpern, M., Hinshaw, G., Jarosik, N., Kogut, A., Limon, M., Meyer, S. S., Page, L., Tucker, G. S., Wollack, E., & Wright, E. L.
Venue
The Astrophysical Journal Supplement Series
Published
2003-09
Volume
148
Issue
1
Pages
195-211
ISSN
  • 0067-0049 (ISSN-L)
  • 1538-4365
OpenAlex
W2059699043
Cited by
579
References
5
FWCI
57.99
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: First‐Year Wilkinson Microwave Anisotropy Probe(WMAP) Observations: Parameter Estimation Methodology. https://app.cochat.ai/papers/10.1086/377335
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Verde, L., Peiris, H. V., Spergel, D. N., Nolta, M. R., Bennett, C. L., Halpern, M., Hinshaw, G., Jarosik, N., Kogut, A., Limon, M., Meyer, S. S., Page, L., Tucker, G. S., Wollack, E., & Wright, E. L. (2003). First‐Year Wilkinson Microwave Anisotropy Probe(WMAP) Observations: Parameter Estimation Methodology. The Astrophysical Journal Supplement Series. https://doi.org/10.1086/377335

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