High‐Resolution Observations of the Cosmic Microwave Background Power Spectrum with ACBAR

  • Kuo C
  • Ade P
  • Bock J
 et al. 
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Abstract

We report the first measurements of anisotropy in the cosmic microwave background (CMB) radiation
with the Arcminute Cosmology Bolometer Array Receiver (ACBAR). The instrument was installed on the
2.1 m Viper telescope at the South Pole in 2001 January; the data presented here are the product of
observations up to and including 2002 July. We present two deep differential maps produced by
subtracting leading and trailing observations from the main field. The differential maps cover
approximately 24 deg 2 of sky selected for low dust contrast. These results represent the highest
signal-to-noise ratio observations of CMB anisotropy to date; in the deepest 150 GHz band map, we
reached an rms of ~8.0 μK per 5' beam. The 3° extent of the maps and small beam size of the
experiment allow the measurement of the CMB anisotropy power spectrum over the range l = 150-3000
with resolution of Δ l = 150. The contributions of galactic dust and radio sources to the observed
anisotropy are negligible and are removed in the analysis. The resulting power spectrum is found to
be consistent with the primary anisotropy expected in a concordance ΛCDM universe.

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Authors

  • C. L. Kuo

  • P. A. R. Ade

  • J. J. Bock

  • C. Cantalupo

  • M. D. Daub

  • J. Goldstein

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