Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..218c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 218-222.
Astronomy and Astrophysics
Astronomy
7
Astronomical Models, Background Radiation, Cosmology, Gravitational Fields, Relic Radiation, Galactic Clusters, Galactic Evolution
Scientific paper
The anisotropies of the microwave background radiation due to gravitational evolution of nonlinear, pancake-type cosmic structures are studied in the framework of the potential approximation method. Simple models of a uniform-density thin collapsing disk and an infinite uniform 'sheet' of matter are investigated. We apply the thin-disk model to the case of highly flattened clusters of galaxies and the infinite-sheet model to the case of the 'Great Wall'. Predicted anisotropies are well below present observational upper limits; in particular, the anisotropy generated by the 'Great Wall' turns out to be less than about 10 exp -6. The lack of increase of microwave background anisotropies from flattened cosmic structures with respect to those generated by spherical ones is mainly due to the fact that, during a pancake-type collapse, the gravitational potential remains non-singular.
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