Mathematics – Logic
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..431v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 431-441.
Mathematics
Logic
70
Astronomical Photography, Cosmology, Galactic Structure, Anisotropy, Distortion, Ellipticity, Mass Distribution, Red Shift, Relic Radiation, Spherical Harmonics
Scientific paper
The images of 44,462 randomly chosen galaxies between 22.5 and 23.5 J apparent magnitude have been examined in 35 fields for a coherent ellipticity due to cosmological image distortion arising from inhomogeneity and anisotropy in the large-scale mass distribution of the universe. It is found that strong limits can be put on the degree of large angular scale anisotropy in cosmological models. The result for a large-scale ellipticity is null with a three-sigma upper limit of ellipticity less than 0.04 out to a redshift of 0.6, implying that the cosmological distortion is small out to redshifts of about one. Variations in the field-to-field ellipticity over the sky have a dispersion of less than 0.03. This sets a three-sigma upper limit of 0.1 for the mass overdensity contrast in clusters of 1000 Mpc size and a three-sigma upper limit to the Weyl tensor components of about 1.5 x 10 to the -20th/sq yr.
Jarvis J. F.
Tyson Anthony J.
Valdes Francisco
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