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First Year WMAP Observations

Published online by Cambridge University Press:  23 September 2016

C. L. Bennett
Affiliation:
Code 685, Goddard Space Flight Center, Greenbelt, MD 20771
Corresponding

Abstract

The results of the first year WMAP sky survey are full sky microwave maps in five frequency bands from 23 to 94 GHz. Calibration errors are < 0.5% and the low systematic error level is well specified. The cosmic microwave background (CMB) is separated from the foregrounds using the multifrequency data. The 2 ≤ l ≤ 900 anisotropy power spectrum is cosmic variance limited for l < 354 with a signal-to-noise ratio >1 per mode to l = 658. The temperature-polarization cross-power spectrum reveals both acoustic features and a large angle correlation from reionization. The optical depth of reionization is τ = 0.17 ± 0.04. A best-fit cosmological model to the CMB and other measures of large scale structure works remarkably well with only a few parameters. The age of the best-fit universe is t 0 = 13.7 ± 0.2 Gyr old. The matter density is Ω m h 2 = 0.135+0.008 --0.009, the baryon density is Ω b h 2 = 0.0224 ± 0.0009, and the total mass-energy of the universe is Ω tot = 1.02±0.02. For WMAP data alone, n s = 0.99 ± 0.04. The lack of CMB fluctuation power on the largest angular scales reported by COBE and confirmed by WMAP is intriguing. WMAP continues to operate, so results will improve.

Type
Session I: Cosmic Microwave Background and Cosmology
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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