Large-Scale Anisotropy in the 2.7-K Radiation with a Balloon-Borne Maser Radiometer at 24.5 GHz

Physics

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Background Radiations, Origin And Formation Of The Universe

Scientific paper

Observations with a high-sensitivity radiometer, covering 80% of the sky, give substantially improved measurements of anisotropy in the 2.7-K radiation. The dipole effect is (Tx, Ty, Tz)=(-3.07+/-0.17, 0.67+/-0.09, -0.45+/-0.09) mK; the Earth's orbital motion through the 2.7-K radiation is detected. No statistically significant quadrupole effect is seen, and a magnitude limit of 0.19 mK is established at the 90% confidence level. Covariance analysis for angular separations between 10° and 180° gives <δT1δT2><0.01 (mK)2.

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