论文信息 - First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: The Angular Power Spectrum - 字舞流文

First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: The Angular Power Spectrum

We present the angular power spectrum derived from the first-year Wilkinson Microwave Anisotropy Probe (WMAP) sky maps. We study a variety of power spectrum estimation methods and data combinations and demonstrate that the results are robust. The data are modestly contaminated by diffuse Galactic foreground emission, but we show that a simple Galactic template model is sufficient to remove the signal. Point sources produce a modest contamination in the low-frequency data. After masking ~700 known bright sources from the maps, we estimate that residual sources contribute ~3500 μK2 at 41 GHz and ~130 μK2 at 94 GHz to the power spectrum [l(l + 1)Cl/2π] at l = 1000. Systematic errors are negligible compared to the (modest) level of foreground emission. Our best estimate of the power spectrum is derived from 28 cross-power spectra of statistically independent channels. The final spectrum is essentially independent of the noise properties of an individual radiometer. The resulting spectrum provides a definitive measurement of the cosmic microwave background (CMB) power spectrum, with uncertainties limited by cosmic variance, up to l ~ 350. The spectrum clearly exhibits a first acoustic peak at l = 220 and a second acoustic peak at l ~ 540 (Page and coworkers), and it provides strong support for adiabatic initial conditions (Spergel and coworkers). Kogut and coworkers analyze the C power spectrum and present evidence for a relatively high optical depth and an early period of cosmic reionization. Among other things, this implies that the temperature power spectrum has been suppressed by ~30% on degree angular scales, as a result of secondary scattering.

M. Halpern | Edward J. Wollack | S. S. Meyer | E. Wollack | G. S. Tucker | UCLA | L. Verde | C. Barnes | M. Limon | Princeton | N. Jarosik | C. L. Bennett | G. Hinshaw | L. Page | A. Kogut | UBC | L. Verde | U. Chicago | G. Hinshaw | E. Komatsu | C. Bennett | M. Halpern | R. Hill | N. Jarosik | A. Kogut | M. Limon | S. Meyer | L. Page | D. Spergel | G. Tucker | J. Weiland | Ucla | Ubc | C. Barnès | Brown | Ssai | E. L. W. N. Gsfc | D. N. Spergel | U. Chicago | E. Komatsu | R. S. Hill | J. Weiland | SSAI | E. L. Wright NASA's GSFC | Princeton | S. Meyer

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