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Contributions to the Local Gravitational Field from beyond the Local Supercluster

Published online by Cambridge University Press:  04 August 2017

A. Yahil
A. Yahil*
Affiliation:
Astronomy Program, State University of New York, Stony Brook, NY 11794-2100, USA

Abstract

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IRAS 60μ sources are used to map the local (≲200h−1 Mpc, Ho =100h km s−1 Mpc−1) gravitational field, and to determine its dipole component, on the assumption that the infrared radiation traces the matter. The dipole moment is found to point in the direction of the anisotropy of the microwave background radiation. Comparison of the two anisotropies, using linear perturbation theory, yields an estimate of the cosmological density parameter, Ω =0.85±0.16, with nonlinear effects increasing Ωo by ∼15%. The quadrupolar tidal field within the Local Supercluster, due presumably to the same density inhomogeneities, is detected in a kinematical study of the velocity field.

Type
Review Paper
Information
Symposium - International Astronomical Union , Volume 117: Dark Matter in the Universe , 1987 , pp. 435 - 443
Copyright
Copyright © Reidel 1987 

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