The anisotropy in the cosmic microwave background at degree angular scales

C. B. Netterfield, N. Jarosik, L. Page, D. Wilkinson, E. Wollack

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Abstract

We detect anisotropy in the cosmic microwave background (CMB) at degree angular scales and confirm a previous detection reported by Wollack et al. (1993). The root-mean-squared amplitude of the fluctuations is 44-7+13 μK. This may be expressed as the square root of the angular power spectrum in a band of multipoles between leff = 69-22+29. We find δTl = [l(2l + 1)〈|alm|2〉/4π]1/2 = 42-7+12 μK. The measured spectral index of the fluctuations is consistent with zero, the value expected for the CMB. The spectral index corresponding to Galactic free-free emission, the most likely foreground contaminant, is rejected at ∼ 3 σ. The analysis is based on three independent data sets. The first, taken in 1993, spans the 26-36 GHz frequency range with three frequency bands; the second was taken with the same radiometer as the first but during an independent observing campaign in 1994; and the third, also taken in 1994, spans the 36-46 GHz range in three bands. For each telescope position and radiometer channel, the drifts in the instrument offset are ≤4 μK day-1 averaged over a period of 1 month. The dependence of the inferred anisotropy on the calibration and data editing is addressed.

Original languageEnglish (US)
Pages (from-to)L69-L72
JournalAstrophysical Journal
Volume445
Issue number2 PART 2
DOIs
StatePublished - Jun 1 1995

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmic microwave background
  • Cosmology: observations

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    Netterfield, C. B., Jarosik, N., Page, L., Wilkinson, D., & Wollack, E. (1995). The anisotropy in the cosmic microwave background at degree angular scales. Astrophysical Journal, 445(2 PART 2), L69-L72. https://doi.org/10.1086/187892