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Title:
Dipole Anisotropy in the COBE Differential Microwave Radiometers First-Year Sky Maps
Authors:
Kogut, A.; Lineweaver, C.; Smoot, G. F.; Bennett, C. L.; Banday, A.; Boggess, N. W.; Cheng, E. S.; de Amici, G.; Fixsen, D. J.; Hinshaw, G.; Jackson, P. D.; Janssen, M.; Keegstra, P.; Loewenstein, K.; Lubin, P.; Mather, J. C.; Tenorio, L.; Weiss, R.; Wilkinson, D. T.; Wright, E. L.
Publication:
Astrophysical Journal v.419, p.1 (ApJ Homepage)
Publication Date:
12/1993
Origin:
APJ; KNUDSEN
Astronomy Keywords:
COSMOLOGY: COSMIC MICROWAVE BACKGROUND, COSMOLOGY: OBSERVATIONS
DOI:
10.1086/173453
Bibliographic Code:
1993ApJ...419....1K

Abstract

We present a determination of the cosmic microwave background dipole amplitude and direction from the COBE Differential Microwave Radiometers (DMR) first year of data. Data from the six DMR channels are consistent with a Doppler-shifted Planck function of dipole amplitude DeltaT = 3.365±0.027 mK toward direction (lII, bII) = (264°.4±0°.3, 48°.4±0°.5). The implied velocity of the Local Group with respect to the CMB rest frame is upsiloLG = 627±22 km s-1 toward (lII, bII) = (276°±3°, 30°±3°). DMR has also mapped the dipole anisotropy resulting from the Earth's orbital motion about the Solar system barycenter, yielding a measurement of the monopole CMB temperature T0 at 31.5, 53, and 90 GHz, T0 = 2.75±0.05 K.

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