Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..455b&link_type=abstract
After the first three minutes. AIP Conference Proceedings, Volume 222, pp. 455-458 (1991).
Physics
Observational Cosmology, Relativity And Gravitation
Scientific paper
Inhomogeneity in the large scale distribution of mass in the universe on scales ~100 h-1 Mpc can induce a coherent shear distortion in the images of background galaxies. This distortion may be measurable over patches of the sky a few degrees in size. Simulations of giant voids, great attractors and walls as randomly located structures, expanding with the universe, indicate that the mean correlated ellipticity of the images of high redshift (z>~2) galaxies is roughly 0.3ΩLSS, where ΩLSS is the density parameter of the inhomogeneously distributed mass on scales ~100 Mpc. The correlation length is roughly 1°. Simulations of biased cold and hot dark matter cosmogonies produce correlated ellipticities ~0.03 with correlation lengths ~0.5°, 0.6°, respectively. The faint blue galaxies discovered by Tyson and collaborators have a surface density of ~3×105 per square degree and should provide an ideal set of background sources for measuring this effect.
Blandford Roger. D.
Brainerd Tereasa G.
Saust Ann B.
Villumsen Jens Verner
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