Preliminary DMR measurements of the CMB isotropy

Details Preliminary DMR measurements of the CMB isotropy Preliminary DMR measurements of the CMB isotropy

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222...95s&link_type=abstract

In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19

Astronomy and Astrophysics

Astronomy

1

Cosmic Background Explorer Satellite, Cosmology, Microwave Radiometers, Relic Radiation, Sky Surveys (Astronomy), Anisotropy, Milky Way Galaxy, Spectral Emission

Scientific paper

The COBE Differential Microwave Radiometers (DMR) instrument has produced preliminary full-sky maps at frequencies 31.5, 53, and 90 GHz. The redundant channels and matched beams at three frequencies distinguish the DMR from previous large-scale surveys. Galactic emission is seen unambiguously at all three frequencies. The only large-scale anisotropy detected in the cosmic microwave background is the dipole anisotropy. There is no clear evidence for any other large-angular-scale feature in the maps. Without correcting for any systematic effects, we are able to place limits DeltaT/T0 less than 3 x 10 exp -5 for the rms quadrupole amplitude, DeltaT/T0 less than 4 x 10 exp -5 for monochromatic fluctuations, and DeltaT/T0 less than 4 x 10 exp -5 for Gaussian fluctuations (all limits are 95 percent C.L. with TO = 2.735 K). The data limit DeltaT/T0 less than 10 exp -4 for any feature larger than 7 deg. We briefly review the DMR and discuss some implications of these results in cosmology.

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