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Preliminary DMR measurements of the CMB isotropyThe 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/T sub 0 less than 3 x 10 exp -5 for the rms quadrupole amplitude, DeltaT/T sub 0 less than 4 x 10 exp -5 for monochromatic fluctuations, and DeltaT/T sub 0 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/T sub 0 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.
Document ID
19930039615
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smoot, G. F.
(Lawrence Berkeley Lab.; California Univ. Berkeley, United States)
Bennett, C. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kogut, A.
(National Research Council; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
Aymon, J.
(Lawrence Berkeley Lab.; California Univ. Berkeley, United States)
Backus, C.
(ST Systems, Inc. Greenbelt, MD, United States)
De Amici, G.
(Lawrence Berkeley Lab.; California Univ. Berkeley, United States)
Galuk, K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jackson, P. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Keegstra, P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rokke, L.
(ST Systems Inc. Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 1990 (A93-23605 07-90)
Publisher: American Institute of Physics
Subject Category
Space Radiation
Accession Number
93A23612
Distribution Limits
Public
Copyright
Other

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