A measurement of the angular power spectrum of the anisotropy in the cosmic microwave background

C. B. Netterfield, M. J. Devlin, N. Jarosik, L. Page, E. J. Wollack

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Abstract

We report on a measurement of the angular power spectrum of the anisotropy in the cosmic microwave background (CMB). The anisotropy is measured in 23 different multipole bands from l = 54 (≈3°) to l = 404 (≈0°.45) and in six frequency bands from 26 to 46 GHz over three observing seasons. The measurements are consistent from year to year. The frequency spectral index of the fluctuations (measured at low l) is consistent with that of the CMB and inconsistent with either dust or Galactic free-free emission. Furthermore, the observations of the MSAM1-92 experiment (Cheng et al. 1994) are repeated and confirmed. The angular spectrum shows a distinct rise from δTl ≡ [l(2l + 1)〈|a1m|2〉/4π]1/2 = 49-5+8 μK at l = 87 to δTl = 85-8+10 μK at l = 237. These values do not include an overall ±14% (1 σ) calibration uncertainty. The analysis and possible systematic errors are discussed.

Original languageEnglish (US)
Pages (from-to)47-66
Number of pages20
JournalAstrophysical Journal
Volume474
Issue number1 PART I
DOIs
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmic microwave background
  • Cosmology: observations

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