Preliminary results from the COBE differential microwave radiometers - Large angular scale isotropy of the cosmic microwave background

Details Preliminary results from the COBE differential microwave radiometers - Large angular scale isotropy of the cosmic microwave background Preliminary results from the COBE differential microwave radiometers - Large angular scale isotropy of the cosmic microwave background

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l...1s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 10, 1991, p. L1-L5.

Other

194

Background Radiation, Cosmic Rays, Cosmology, Microwaves, Universe, Cosmic Background Explorer Satellite, Microwave Radiometers, Milky Way Galaxy

Scientific paper

Preliminary but precise micowave maps are presented of the sky, and thus of the early universe, derived as the first results from the Differential Microwave Radiometers experiment aboard COBE. The dipole anisotropy attributed to the motion of the solar system with respect to the CMB reference frame shows strongly in all six sky maps and is consistent with a Doppler-shifted thermal spectrum. The best-fitted dipole has amplitude 3.3 + or - 0.2 mK in the direction (alpha, delta) = 11.2 h + or - 0.2 h, -7 deg + or - 2 deg (J2000) or (l,b) = 265 deg + or - 2 deg, 48 deg + or - 2 deg. There is no clear evidence in the maps for any other large angular-scale feature. Limits on Delta T/T0 of 3 x 10 to the -5th (T0 = 2.735 K), 4 x 10 to the -5th, and 4 x 10 to the -5th are found for the rms quadrupole amplitude, monochromatic fluctuations, and Gaussian fluctuations, respectively. These measurements place the most severe constraints to date on many potential physical processes in the early universe.

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