Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pazh....9..451d&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 9, July-Aug. 1983, p. 451-455) Soviet Astronomy Letters (ISSN 0360-0327), vol. 9, July-
Astronomy and Astrophysics
Astrophysics
1
Big Bang Cosmology, Galactic Clusters, Galactic Evolution, Missing Mass (Astrophysics), Neutrinos, Baryons, Capture Effect, Gas Density, Mass Distribution
Scientific paper
If allowance is made for the random thermal velocities of the massive neutrinos, the density of the gaseous (baryon) component (rho-b) will dominate the neutrino density (rho-nu) in the central part of a primordial 'pancake' (rho-b greater than rho-nu), even though on the average rho-b is much less than rho-nu. Hence the fragmentation of a gaseous pancake and the subsequent agglomeration of the fragments into galaxies and groups of galaxies will be controlled by the velocity distribution and self-gravity of the gaseous component. Neutrino capture by the aggregating clouds would account for the missing mass. Galaxy clusters, on the contrary, would develop from perturbations embracing complete neutrino-gaseous pancakes, so that the initial density ratio of the neutrino and gaseous components would be restored. The earliest pancakes probably formed at redshifts z = 5-8.
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