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Small Scale Fluctuations in the Microwave Background Radiation Associated with the Formation of Galaxies

  • R. A. Sunyaev
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 74)

Abstract

According to current ideas, massive extragalactic systems such as galaxies and clusters of galaxies formed as a result of the growth of small fluctuations in density and velocity which were present in the early stages of expansion of the Universe under the influence of gravitational instability. According to the hot model of the Universe at the epoch corresponding to a redshift z » 1500, recombination of primaeval hydrogen took place and as a result the optical depth of the Universe to Thomson scattering decreased abruptly from about 1000 to 1 — the Universe became transparent. Therefore the observed angular distribution of the microwave background radiation (MWBR) contains information about inhomogeneities in its spatial distribution at a redshift z ~ 1000. Silk (1968) was the first to note that this “photograph” of the Universe at the epoch of recombination must be enscribed with fluctuations associated with perturbations in the space density and velocity of motion of matter which will later lead to the formation of galaxies and clusters of galaxies.

Keywords

Temperature Fluctuation Optical Depth Radio Source Radio Galaxy Velocity Perturbation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© International Astronomical Union 1977

Authors and Affiliations

  • R. A. Sunyaev
    • 1
  1. 1.Space Research InstituteUSSR Academy of SciencesMoscowUSSR

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