Sound speed at recombination time and galaxy formation

Details Sound speed at recombination time and galaxy formation Sound speed at recombination time and galaxy formation

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..267b&link_type=abstract

Astronomy and Astrophysics, vol. 35, no. 2, Oct. 1974, p. 267-270. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

3

Acoustic Velocity, Cosmology, Galactic Evolution, Hydrogen Recombinations, Compression Waves, Radiative Transfer, Thomson Scattering, Turbulence Effects, Vorticity, Wave Propagation

Scientific paper

A tentative computation of the velocity of sound during hydrogen recombination is presented, and we try to determine the value of z at which the primeval vorticity becomes supersonic. The velocity of sound is found to depend on wave-length and to have higher values on larger scales; therefore, it is possible that the formation of shock waves involving masses large enough to give rise directly to galaxies would occur only at a late z. The high rate of dissipation would then make it hard for vorticity to survive so long unless a turbulence feeding mechanism can be devised.

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