The Dipole Observed in the COBE DMR Four-Year Data

Details The Dipole Observed in the COBE DMR Four-Year Data The Dipole Observed in the COBE DMR Four-Year Data

1996-01-26

arxiv.org/abs/astro-ph/9601151v2

Astrophys.J.470:38-42,1996

Astronomy and Astrophysics

Astrophysics

New and improved version; to be published in ApJ next month

Scientific paper

10.1086/177846

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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