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The Motion of the Local Group of Galaxies with Respect to the Background of Galaxies

Published online by Cambridge University Press:  04 August 2017

R. D. Davies
R. D. Davies*
Affiliation:
University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire, U.K.

Extract

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A measurement of the motion of the Local Group of galaxies through the Universe provides an indication of their peculiar motion relative to the Hubble flow consequent upon the gravitational influence of the local large scale mass inhomogeneities. This motion can be measured either relative to the cosmic microwave background at z ∼ 1000 or relative to the background or nearby (z ∼ 0.01) galaxies. The interpretation of published measurements is subject to some uncertainty. As an example, the Local Group motion derived from optical studies of nearby galaxies (Rubin et al. 1976) differs from that derived from radio frequency measurements of the dipole anisotropy in the microwave background. (Boughn et al. 1981, Gorenstein & Smoot 1981).

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 104: Early Evolution of the Universe and Its Present Structure , 1983 , pp. 255 - 258
Copyright
Copyright © Reidel 1983 

References

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Davies, R.D. & Johnson, S.C., 1983. In preparation.Google Scholar
Gorenstein, M.V. & Smoot, G.F., 1981. Astrophys. J., 244, 351.CrossRefGoogle Scholar
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Rubin, V.C., Thonnard, N., Ford, W.K. & Roberts, M.S., 1976. Astron. J., 81, 719.CrossRefGoogle Scholar