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The Dipole Observed in the COBE DMR Four-Year Data

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arxiv astro-ph/9601151 v2 pith:OXKGC32C submitted 1996-01-26 astro-ph

The Dipole Observed in the COBE DMR Four-Year Data

classification astro-ph
keywords dipolecobedatamicrowaveuncertaintiesamplitudeanisotropyapprox
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abstract

The largest anisotropy in the cosmic microwave background (CMB) is the $\approx 3$ mK dipole assumed to be due to our velocity with respect to the CMB. Using the four year data set from all six channels of the COBE Differential Microwave Radiometers (DMR), we obtain a best-fit dipole amplitude $3.358 \pm 0.001 \pm 0.023$ mK in the direction $(l,b)=(264\deg.31 \pm 0\deg.04 \pm 0\deg.16, +48\deg.05 \pm 0\deg.02 \pm 0\deg.09)$, where the first uncertainties are statistical and the second include calibration and combined systematic uncertainties. This measurement is consistent with previous DMR and FIRAS results

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