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For refcode 1999MNRAS.309..750D:
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Copyright by Royal Astronomical Society. 1999MNRAS.309..750D Cosmic microwave background observations with the Jodrell Bank-IAC interferometer at 33 GHz S. R. Dicker, S. J. Melhuish, R. D. Davies, C. M. Gutiirrez, R. Rebolo, D. L. Harrison, R. J. Davis, A. Wilkinson, R. J. Hoyland and R. A. Watson Accepted 1999 June 21. Received 1999 May 26; in original form 1999 March 12 ABSTRACT This paper presents the first results obtained with the Jodrell Bank-IAC two-element 33-GHz interferometer. The instrument was designed to measure the level of the cosmic microwave background (CMB) fluctuations at angular scales of 1^deg^-2^deg^. The observations analysed here were taken in a strip of the sky at Dec.=+41^deg^ with an element separation of 16.7{lambda}, which gives a maximum sensitivity to ~1.6^deg^ structures on the sky. The data processing and calibration of the instrument are described. The sensitivity achieved in each of the two channels is 7 microK per resolution element. A reconstruction of the sky at Dec.=+41^deg^ using a maximum entropy method shows the presence of structure at a high level of significance. A likelihood analysis, assuming a flat CMB spatial power spectrum, gives a best estimate of the level of CMB fluctuations of {DELTA}T_e_ = 43_-12_^+13^ microK for the range l = 109+/-19; the main uncertainty in this result arises from sample variance. We consider that the contamination from the Galaxy is small. These results represent a new determination of the CMB power spectrum on angular scales at which previous results show a large scatter; our new results are in agreement with the theoretical predictions of the standard inflationary cold dark matter models. Keywords: instrumentation: interferometers - cosmic microwave background - cosmology: observations - large-scale structure of Universe
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