Effect of the Great Attractor on the cosmic microwave background radiation

Details Effect of the Great Attractor on the cosmic microwave background radiation Effect of the Great Attractor on the cosmic microwave background radiation

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.345..507b&link_type=abstract

Nature (ISSN 0028-0836), vol. 345, June 7, 1990, p. 507, 508. Research supported by NASA, NSF, and the U.S.-Israeli Binational S

Mathematics

Logic

31

Background Radiation, Gravitational Fields, Microwaves, Radial Velocity, Relic Radiation, Strange Attractors, Anisotropy, Gravitational Effects, Red Shift

Scientific paper

A 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.

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