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Title:
The correlation function of galaxy ellipticities produced by gravitational lensing
Authors:
Miralda-Escude, Jordi
Affiliation:
AA(Princeton University Observatory, NJ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 1-8. (ApJ Homepage)
Publication Date:
10/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Dark Matter, Elliptical Galaxies, Galactic Clusters, Gravitational Lenses, Space Density, Galactic Mass, Quasars, Statistical Correlation, Universe
DOI:
10.1086/170555
Bibliographic Code:
1991ApJ...380....1M

Abstract

The correlation of galaxy ellipticities produced by gravitational lensing is calculated as a function of the power spectrum of density fluctuations in the universe by generalizing an analytical method developed by Gunn (1967). The method is applied to a model where identical objects with spherically symmetric density profiles are randomly laid down in space, and to the cold dark matter model. The possibility of detecting this correlation is discussed. Although an ellipticity correlation can also be caused by an intrinsic alignment of the axes of galaxies belonging to a cluster or a supercluster, a method is suggested by which one type of correlation can be distinguished from another. The advantage of this ellipticity correlation is that it is one of the few astronomical observations that can directly probe large-scale mass fluctuations in the universe.

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