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Title:
The 'black' regions of the Universe
Authors:
ZELDOVICH, IA. B.; SHANDARIN, S. F.
Affiliation:
AB(Akademiia Nauk SSSR, Institut Prikladnoi Matematiki, Moscow, USSR)
Journal:
(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Mar. 1982, p. 131-135.) Soviet Astronomy Letters, vol. 8, Mar.-Apr. 1982, p. 67-69. Translation.
Publication Date:
04/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMOLOGY, DENSITY WAVE MODEL, GALAXIES, SPACE DENSITY, UNIVERSE, FRAGMENTATION, GALACTIC CLUSTERS, GALACTIC EVOLUTION, MASS DISTRIBUTION, SPATIAL DISTRIBUTION
Bibliographic Code:
1982SvAL....8..131Z

Abstract

The significance of regions devoid of galaxies (black regions) for the bunching and fragmentation theories of the evolution of the Universe is discussed. The former theory accounts for black regions in terms of gravitational instabilities alone, a highly unlikely explanation. The fragmentation theory holds that instabilities originally occurred on the largest scales, with galaxies forming at sites of higher density via shock wave compression and cooling. Using the theory, a lower limit on the average density of the gas remaining in the black regions can be set, based on the finding that eight percent of gas elements are expanding in all three dimensions at the first stage of fragmentation. The gas in the black regions would be heated to a high enough temperature by radiation from surrounding galaxies to prevent galaxy formation there. Decisive support for the fragmentation theory would be provided by finding the black regions filled with hot gas of pregalactic abundances. If the gas were found to contain heavy elements, the bunching theory would be supported. 
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