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Effect of the Great Attractor on the cosmic microwave background radiationA map is presented of the anisotropy Delta T/T in cosmic microwave background (CMB) temperature of our region of the universe as viewed by a distant observer, predicted on the basis of the gravitational potential field. This field is calculated in the vicinity of the Local Group of galaxies from the observed peculiar velocities of galaxies under the assumption that the peculiar motions are induced by gravity. If the cosmological density parameter Omega is one, the gravitational potential field of the Great Attractor and surrounding regions produces a maximum Sachs-Wolfe anisotropy of Delta T/T = (1.7 + or - 0.3) x 10 to the -5th on an angular scale of 1 deg. Doppler and adiabatic contributions to this anisotropy are expected to be somewhat larger. If similar fluctuations in the gravitational potential are present elsewhere in the universe, the anisotropy present when the CMB was last scattered should be visible from the earth and should be detectable in current experiments.
Document ID
19900050867
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bertschinger, Edmund
(MIT Cambridge, MA, United States)
Gorski, Krzysztof M.
(Los Alamos National Laboratory NM, United States)
Dekel, Avishai
(Hebrew University Jerusalem, Israel)
Date Acquired
August 14, 2013
Publication Date
June 7, 1990
Publication Information
Publication: Nature
Volume: 345
ISSN: 0028-0836
Subject Category
Space Radiation
Accession Number
90A37922
Distribution Limits
Public
Copyright
Other

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