Mass of a Galaxy and Dissipative Process in the Hot Universe

Details Mass of a Galaxy and Dissipative Process in the Hot Universe Mass of a Galaxy and Dissipative Process in the Hot Universe

Feb 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971pthph..45..370s&link_type=abstract

Progress of Theoretical Physics, Vol. 45, No. 2, pp. 370-385

Physics

28

Scientific paper

Decay of the acoustic motions in an early stage of the hot universe is studied in detail. Considering a growth of density perturbation by gravitation and its decay by dissipative processes, i.e. viscosity and thermal conductivity, we can get a gross feature of the size spectrum of density inhomogeneity at the stage of recombination of the cosmic plasma. The size spectrum has a flat maximum between 1012-13 M_&sun; and 1017-18 M_&sun;. After the time of decoupling, the density perturbation evolves into a galaxy or a cluster of galaxies by the hydrodynamical instability. The maximum mass formed by this mechanism is given as 1014-15 M_&sun; assuming the density perturbation δρ/ρ ≃ 10-1.

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