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Preliminary DMR measurements of the CMB isotropy

AIP Conf. Proc. -- April 15, 1991 -- Volume 222, pp. 95-106
After the first three minutes; doi:10.1063/1.40385

Issue Date: 15 April 1991

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G. F. Smoot
Lawrence Berkeley Laboratory and Space Sciences Laboratory, University of California, Berkeley

C. L. Bennett
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center

A. Kogut
National Research Council, NASA/GSFC

J. Aymon
Lawrence Berkeley Laboratory and Space Sciences Laboratory, University of California, Berkeley

C. Backus
ST Systems Inc.

G. De Amici
Lawrence Berkeley Laboratory and Space Sciences Laboratory, University of California, Berkeley

K. Galuk, P. D. Jackson, P. Keegstra, and L. Rokke
ST Systems Inc.

L. Tenorio
Lawrence Berkeley Laboratory and Space Sciences Laboratory, University of California, Berkeley

S. Gulkis
NASA Jet Propulsion Laboratory, Pasadena

M. G. Hauser
Laboratory for Astronomy and Solar Physics, NASA Goodard Space Flight Center

M. Janssen
NASA Jet Propulsion Laboratory, Pasadena

J. C. Mather
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center

R. Weiss
Massachusetts Institute of Technology

D. T. Wilkinson
Princeton University

E. L. Wright
University of California, Los Angeles

N. W. Boggess, E. S. Cheng, and T. Kelsall
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center

P. Lubin
University of California, Santa Barbara

S. Meyer
Massachusetts Institute of Technology

S. H. Moseley
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center

T. L. Murdock
General Research Corporation

R. A. Shafer and R. F. Silverberg
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center
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<3×10−5 for the rms quadrupole amplitude, DeltaT/T0<4×10−5 for monochromatic fluctuations, and DeltaT/T0<4×10−5 for Gaussian fluctuations (all limits are 95% C.L. with T0=2.735 K). The data limit DeltaT/T0<10−4 for any feature larger than 7°. We briefly review the DMR and discuss some implications of these results for cosmology.
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KEYWORDS and PACS

Keywords
PACS
  • 98.70.Vc
    Stellar systems; galactic and extragalactic objects and systems; the Universe Other sources and radiations (including cosmic rays outside the Solar System) Background radiations
  • 95.55.Nd
    Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations Astronomical and space-research instrumentation Astrophysical and aerospace (including spectroscopic) instrumentation
  • 95.85.Bh
    Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations Astronomical observations Radio, microwave, and submillimeter
  • YEAR: 1990-91

PUBLICATION DATA

ISSN:
0094-243X (print)  
Publisher:
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