Subject: First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determinati
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Abstract

Title:

First-Year Wilkinson Microwave Anisotropy Probe
(WMAP) Observations: Determination of Cosmological Parameters

Authors:

Spergel, D. N.;
Verde, L.;
Peiris, H. V.;
Komatsu, E.;
Nolta, M. R.;
Bennett, C. L.;
Halpern, M.;
Hinshaw, G.;
Jarosik, N.;
Kogut, A.;
Limon, M.;
Meyer, S. S.;
Page, L.;
Tucker, G. S.;
Weiland, J. L.;
Wollack, E.;
Wright, E. L.

Affiliation:

AA(Department of Astrophysical Sciences,
Princeton University, Princeton, NJ 08544.), AB(Department of
Astrophysical Sciences, Princeton University, Princeton, NJ 08544.;
Chandra Postdoctral Fellow.), AC(Department of Astrophysical Sciences,
Princeton University, Princeton, NJ 08544.), AD(Department of
Astrophysical Sciences, Princeton University, Princeton, NJ 08544.),
AE(Department of Physics, Jadwin Hall, Princeton, NJ 08544.), AF(NASA
Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.),
AG(Department of Physics and Astronomy, University of British Columbia,
Vancouver, BC V6T 1Z1, Canada.), AH(NASA Goddard Space Flight Center, Code
685, Greenbelt, MD 20771.), AI(Department of Physics, Jadwin Hall,
Princeton, NJ 08544.), AJ(NASA Goddard Space Flight Center, Code 685,
Greenbelt, MD 20771.), AK(NASA Goddard Space Flight Center, Code 685,
Greenbelt, MD 20771.; National Research Council (NRC) Fellow.),
AL(Departments of Astrophysics and Physics, EFI, and CfCP, University of
Chicago, Chicago, IL 60637.), AM(Department of Physics, Jadwin Hall,
Princeton, NJ 08544.), AN(NASA Goddard Space Flight Center, Code 685,
Greenbelt, MD 20771.; National Research Council (NRC) Fellow.; Department
of Physics, Brown University, Providence, RI 02912.), AO(Science Systems
and Applications, Inc. (SSAI), 10210 Greenbelt Road, Suite 600, Lanham, MD
20706.), AP(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD
20771.), AQ(Department of Astronomy, UCLA, P.O. Box 951562, Los Angeles,
CA 90095-1562.)

Publication:

The Astrophysical Journal Supplement Series,
Volume 148, Issue 1, pp. 175-194. (ApJS Homepage)

Publication Date:

09/2003

Origin:

UCP

ApJ Keywords:

Cosmology: Cosmic Microwave Background,
Cosmology: Cosmological Parameters- Cosmology: Observations, Cosmology:
Early Universe

Abstract Copyright:

(c) 2003: The American Astronomical
Society

DOI:

10.1086/377226

Bibliographic Code:

2003ApJS..148..175S

Abstract
WMAP precision data enable accurate testing of
cosmological models. We find that the emerging standard model of cosmology, a
flat Λ-dominated universe seeded by a nearly scale-invariant adiabatic Gaussian
fluctuations, fits the WMAP data. For the WMAP data only, the best-fit
parameters are h=0.72+/-0.05, Ωbh2=0.024+/-0.001,
Ωmh2=0.14+/-0.02,
τ=0.166+0.076-0.071, ns=0.99+/-0.04, and
σ8=0.9+/-0.1. With parameters fixed only by WMAP data, we can fit
finer scale cosmic microwave background (CMB) measurements and measurements of
large-scale structure (galaxy surveys and the Lyα forest). This simple model is
also consistent with a host of other astronomical measurements: its inferred age
of the universe is consistent with stellar ages, the baryon/photon ratio is
consistent with measurements of the [D/H] ratio, and the inferred Hubble
constant is consistent with local observations of the expansion rate. We then
fit the model parameters to a combination of WMAP data with other finer scale
CMB experiments (ACBAR and CBI), 2dFGRS measurements, and Lyα forest data to
find the model's best-fit cosmological parameters:
h=0.71+0.04-0.03,
Ωbh2=0.0224+/-0.0009,
Ωmh2=0.135+0.008-0.009,
τ=0.17+/-0.06, ns(0.05 Mpc-1)=0.93+/-0.03, and
σ8=0.84+/-0.04. WMAP's best determination of τ=0.17+/-0.04 arises
directly from the temperature-polarization (TE) data and not from this model
fit, but they are consistent. These parameters imply that the age of the
universe is 13.7+/-0.2 Gyr. With the Lyα forest data, the model favors but does
not require a slowly varying spectral index. The significance of this running
index is sensitive to the uncertainties in the Lyα forest.

By combining WMAP data with other astronomical data, we constrain the
geometry of the universe, Ωtot=1.02+/-0.02, and the equation of state
of the dark energy, w<-0.78 (95% confidence limit assuming w>=-1). The
combination of WMAP and 2dFGRS data constrains the energy density in stable
neutrinos: Ωνh2<0.0072 (95% confidence limit). For
three degenerate neutrino species, this limit implies that their mass is less
than 0.23 eV (95% confidence limit). The WMAP detection of early reionization
rules out warm dark matter.

WMAP is the result of a partnership between Princeton University and the NASA
Goddard Space Flight Center. Scientific guidance is provided by the WMAP Science
Team.

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