On the time of galaxy formation in a turbulent universe

Details On the time of galaxy formation in a turbulent universe On the time of galaxy formation in a turbulent universe

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....41...55b&link_type=abstract

Astronomy and Astrophysics, vol. 41, no. 1, June 1975, p. 55-59. Research supported by the Consiglio Nazionale delle Ricerche.

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Cosmology, Galactic Evolution, Red Shift, Turbulence Effects, Propagation Modes, Radiation Effects, Supersonic Flow, Time Dependence, Universe

Scientific paper

In the framework of a turbulent theory of galaxy formation, it is shown that the redshift at which nonlinear effects may become relevant on galactic scales should be lowered from about 1500 down to about 300, the main reason being that the residual interaction of matter with radiation is significant even when hydrogen ionization reaches very low values. As a consequence, galaxies would be formed later, and a long period of practically neutral hydrogen would be present between a redshift somewhat lower than 1500 and the redshift about 300 after which matter can no longer be treated as incompressible.

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