A degree-scale measurement of anisotropy of the cosmic background radiation

Todd Gaier, Jeffrey Schuster, Joshua Gundersen, Timothy Koch, Michael Seiffert, Peter Meinhold, Philip Lubin

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102 Scopus citations

Abstract

We report on the preliminary result of a search for anisotropy in the cosmic background radiation (CBR) with a beam size of ≈ 1°.5 FWHM over a wavelength range of 8-12 mm. The system operated successfully for 500 hr at the South Pole during the 1990-1991 austral summer. The data from one region, representing 25 hr after editing, are presented here. A strong signal is present in the lower frequency channels with a spectrum unlike CBR fluctuations, and is probably due to foreground emission. The highest frequency channel has the smallest contribution from this signal and has been used to set a 95% confidence level upper limit of ΔT/T ≤ 1.4 × 10-5 for fluctuations with a Gaussian autocorrelation function at a coherence angle of 1°.2. This is significantly more sensitive than previous experiments at this angular scale.

Original languageEnglish (US)
Pages (from-to)L1-L4
JournalAstrophysical Journal
Volume398
Issue number1 PART 2
DOIs
StatePublished - Oct 10 1992

Keywords

  • Cosmology: cosmic microwave background

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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