University of California at Santa Barbara Anisotropy Program: Degree Scale Results from the South Pole 1990-1991

Details University of California at Santa Barbara Anisotropy Program: Degree Scale Results from the South Pole 1990-1991 University of California at Santa Barbara Anisotropy Program: Degree Scale Results from the South Pole 1990-1991

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pnas...90.4777g&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 90, Issue 11, pp. 4777-4778

Physics

Scientific paper

We report on the preliminary result of a search for anisotropy in the cosmic background radiation (CBR). Our receiver operates with four equally spaced channels from 25 to 35 GHz with a beam size of ≈1.5^circ full width at half maximum. The system operated successfully for 500 hr at the South Pole during 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. The highest-frequency channel has the smallest contribution from this signal and has been used to set a 95% confidence level upper limit ΔT/T <= 1.4 10-5.

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