6150 K
67 pp.
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TitleLarge-Angular-Scale Anisotropy in the Cosmic Background Radiation
Author(s)Gorenstein, M. V.; Smoot, G. F.
Publication DateMay 1980
Report NumberLBL--10964
Unique IdentifierACC0182
Other NumbersOSTI ID: 893033
Research OrgLawrence Berkeley Laboratory (LBL) [Ernest Orlando Lawrence Berkeley National Laboratory (LBNL)], Berkeley, CA (US)
Contract NoAC02-05CH11231
Sponsoring OrgU.S. Department of Energy (USDOE)
Other InformationThe Astrophysical Journal, Vol. 244, 1981
SubjectCosmic Background Radiation; Cosmology
KeywordsAnisotropy; Microwave Radiometer
Related Web PagesGeorge Smoot, Blackbody, and Anisotropyof the Cosmic Microwave Background Radiation
AbstractWe report the results of an extended series of airborne measurements of large-angular-scale anisotropy in the 3 K cosmic background radiation. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (.089 cm wavelength) flown on board a U-2 aircraft to 20 km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern hemisphere with an rms sensitivity of 47 mK Hz{sup 1}. The measurements how clear evidence of anisotropy that is readily interpreted as due to the solar motion relative to the sources of the radiation. The anisotropy is well fit by a first order spherical harmonic of amplitude 360{+ or -}50km sec{sup -1} toward the direction 11.2{+ or -}0.5 hours of right ascension and 19 {+ or -}8 degrees declination. A simultaneous fit to a combined hypotheses of dipole and quadrupole angular distributions places a 1 mK limit on the amplitude of most components of quadrupole anisotropy with 90% confidence. Additional analysis places a 0.5 mK limit on uncorrelated fluctuations (sky-roughness) in the 3 K background on an angular scale of the antenna beam width, about 7 degrees.
6150 K
67 pp.
View Document 

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