Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243l.113b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Feb. 1, 1981, p. L113-L117. NSF-NASA-supported research.
Astronomy and Astrophysics
Astrophysics
93
Anisotropy, Background Radiation, Cosmology, Microwaves, Relic Radiation, Black Body Radiation, Dipoles, Extremely High Frequencies, Galactic Radio Waves, Noise Temperature, Quadrupoles
Scientific paper
Results of measurements of the dipole and quadrupole anisotropy of the microwave background radiation are reported. Balloon-borne measurements of the temperature difference between two horn antennas pointed 90 deg apart and 45 deg from the zenith were carried out at frequencies of 24.8, 31.4 and 46.0 GHz to determine three dipole and four quadrupole parameters. When combined with data from two previous balloon flights, a dipole anisotropy of 3.78 + or - 0.30 mK in the direction 11.6 + or - 0.2 h RA, -12 + or - 5 deg dec is obtained. The measurements reveal a spectral index of 0.04 + or - 0.28 between 19.0 and 46.0 GHz, indicating that the dipole effect arises from an intrinsic anisotropy in the temperature of the background and/or a first-order Doppler shift due to solar motions. A statistically significant quadrupole effect is also detected which is attributed to the intrinsic anisotropy of the 2.7 K background.
Boughn Stephen P.
Cheng Edward S.
Wilkinson David T.
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