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Title:
Four-Year COBE DMR Cosmic Microwave Background Observations: Maps and Basic Results
Authors:
Bennett, C. L.; Banday, A. J.; Gorski, K. M.; Hinshaw, G.; Jackson, P.; Keegstra, P.; Kogut, A.; Smoot, G. F.; Wilkinson, D. T.; Wright, E. L.
Publication:
Astrophysical Journal Letters v.464, p.L1 (ApJ Homepage)
Publication Date:
06/1996
Origin:
APJ
ApJ Keywords:
COSMOLOGY: COSMIC MICROWAVE BACKGROUND, COSMOLOGY: OBSERVATIONS
DOI:
10.1086/310075
Bibliographic Code:
1996ApJ...464L...1B

Abstract

In this Letter we present a summary of the spatial properties of the cosmic microwave background radiation based on the full 4 yr of COBE Differential Microwave Radiometer (DMR) observations, with additional details in a set of companion Letters. The anisotropy is consistent with a scale-invariant power-law model and Gaussian statistics. With full use of the multifrequency 4 yr DMR data, including our estimate of the effects of Galactic emission, we find a power-law spectral index of n = 1.2 +/- 0.3 and a quadrupole normalization Qrms-PS = 15.3^{+3.8}_{-2.8} mu K. For n = 1 the best-fit normalization is Qrms-PS|n=1 = 18 +/- 1.6 mu K. These values are consistent with both our previous 1 yr and 2 yr results. The results include use of the l = 2 quadrupole term; exclusion of this term gives consistent results, but with larger uncertainties. The final DMR 4 yr sky maps, presented in this Letter, portray an accurate overall visual impression of the anisotropy since the signal-to-noise ratio is ~2 per 10 deg sky map patch. The improved signal-to-noise ratio of the 4 yr maps also allows for improvements in Galactic modeling and limits on non-Gaussian statistics.

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