Dipole Anisotropy in the COBE DMR First-Year Sky Maps
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 Delta T = 3.365 +/-0.027 mK toward direction (l,b) = (264.4 +/- 0.3 deg, 48.4 +/- 0.5 deg). The implied velocity of the Local Group with respect to the CMB rest frame is 627 +/- 22 km/s toward (l,b) = (276 +/- 3 deg, 30 +/- 3 deg). 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 at 31.5, 53, and 90 GHz, to be 2.75 +/- 0.05 K.
Keywords
Cite
@article{arxiv.astro-ph/9312056,
title = {Dipole Anisotropy in the COBE DMR First-Year Sky Maps},
author = {A. Kogut and C. Lineweaver and G. F. Smoot and C. L. Bennett and A. Banday},
journal= {arXiv preprint arXiv:astro-ph/9312056},
year = {2009}
}
Comments
Post Script (4 figures) Ap J 419, 1-6 (1993)