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Title:
First Year Wilkinson Microwave Anisotropy Probe Observations: Dark Energy Induced Correlation with Radio Sources
Authors:
Nolta, M. R.; Wright, E. L.; Page, L.; Bennett, C. L.; Halpern, M.; Hinshaw, G.; Jarosik, N.; Kogut, A.; Limon, M.; Meyer, S. S.; Spergel, D. N.; Tucker, G. S.; Wollack, E.
Affiliation:
AA(Department of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544; .), AB(UCLA Astronomy, P.O. Box 951562, Los Angeles, CA 90095-1562.), AC(Department of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544; .), AD(Code 685, NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AE(Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.), AF(Code 685, NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AG(Department of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544; .), AH(Code 685, NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AI(Code 685, NASA Goddard Space Flight Center, Greenbelt, MD 20771.; National Research Council (NRC) Fellow.), AJ(Departments of Astrophysics and Physics, Enrico Fermi Institute and Center for Cosmological Physics, University of Chicago, Chicago, IL 60637.), AK(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544.), AL(Department of Physics, Brown University, Providence, RI 02912.; National Research Council (NRC) Fellow.), AM(Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.)
Publication:
The Astrophysical Journal, Volume 608, Issue 1, pp. 10-15. (ApJ Homepage)
Publication Date:
06/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Cosmology: Observations
DOI:
10.1086/386536
Bibliographic Code:
2004ApJ...608...10N

Abstract

The first-year Wilkinson Microwave Anisotropy Probe (WMAP) data, in combination with any one of a number of other cosmic probes, show that we live in a flat Λ-dominated cold dark matter (CDM) universe with Ωm~0.27 and ΩΛ~0.73. In this model the late-time action of the dark energy, through the integrated Sachs-Wolfe effect, should produce cosmic microwave background (CMB) anisotropies correlated with matter density fluctuations at z<~2 (Crittenden & Turok 1996). The measurement of such a signal is an important independent check of the model. We cross-correlate the NRAO VLA Sky Survey (NVSS) radio source catalog (Condon et al. 1998) with the WMAP data in search of this signal, and see indications of the expected correlation. Assuming a flat ΛCDM cosmology, we find ΩΛ>0 (95% CL, statistical errors only) with the peak of the likelihood at ΩΛ=0.68, consistent with the preferred WMAP value. A closed model with Ωm=1.28, h=0.33, and no dark energy component (ΩΛ=0), marginally consistent with the WMAP CMB TT angular power spectrum, would produce an anticorrelation between the matter distribution and the CMB. Our analysis of the cross-correlation of the WMAP data with the NVSS catalog rejects this cosmology at the 3 σ level.
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