Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..377d&link_type=abstract
Astronomy and Astrophysics, vol. 50, no. 3, Aug. 1976, p. 377-383. Research supported by the Consiglio Nazionale delle Ricerche
Astronomy and Astrophysics
Astrophysics
2
Astronomical Models, Cosmology, Galactic Evolution, Turbulence, Vortices, Background Radiation, Constraints, Flow Velocity, Galactic Clusters, Hydrogen Recombinations, Inhomogeneity, Plasma Dynamics
Scientific paper
The constraints that should be placed on the variables in the theory of primeval turbulence are analyzed. The evolution in time of the degree of ionization is calculated with allowance for all of the relevant processes. These results are then used to compute the small-scale irregularities of the background radiation and the damping factor of eddy motions. In a number of important cases, the results obtained differ from those where Suniaev and Zeldovich's (1970) analytical expression for the time evolution of the degree of ionization was used. This expression has been derived on the assumption that the recombination rate is determined solely by the two-quantum decay of the 2s level of atomic hydrogen. The evolution of turbulence in the presence of an eddy spectrum in an initial state of equilibrium is discussed.
Danese Lugi
de Zotti Gainfranco
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