Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....69..119c&link_type=abstract
Astronomy and Astrophysics, vol. 69, no. 1, Sept. 1978, p. 119-124.
Astronomy and Astrophysics
Astrophysics
7
Big Bang Cosmology, Galactic Clusters, Galactic Evolution, Gas Dynamics, Adiabatic Conditions, Galactic Rotation, Isotropic Media, Shock Wave Propagation, Vortices
Scientific paper
On the assumption that the formation of large-scale cosmic structure started with clusters of galaxies, violent gas dynamics at the epoch of nonlinear perturbations in the isotropic hot big-bang universe are considered. Shock waves play a key role in the picture and are shown to be adiabatic on the cluster scale at redshifts less than 8. They compress the cosmic material into hot gaseous layers with matter density comparable to that in protoclusters. The characteristic masses of the clusters appear as a result of gasdynamic processes that operate at this epoch. Two types of gasdynamic phenomena, evolutionary and nonevolutionary, are conjectured to be responsible for the two types of clusters like Coma and Virgo, respectively. In the nonevolutionary processes, the protocluster layers contain a tangential discontinuity which generates a turbulent zone within the protocluster.
Chernin Arthur D.
Zilbergleit A. S.
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