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)


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.


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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Anile A.M., Danese L., De Zotti G. and Motta S., 1976. Astrophys. J, 205, L59.ADSCrossRefGoogle Scholar
  2. Arons J. and Wingert D., 1972. Astrophys. J., 177, 1.ADSCrossRefGoogle Scholar
  3. Carpenter R.L., Gulkis S. and Sato H., 1973. Astrophys. J., 182, L61.ADSCrossRefGoogle Scholar
  4. Chibisov G.V., 1972. Astron. Zh., 49, 286.ADSGoogle Scholar
  5. Chibisov G.V. and Ozernoi L.M., 1969. Astrophys. Letters, 3, 189.ADSGoogle Scholar
  6. Conklin E.K. and Bracewell R.N., 1967. Phys. Rev. Letters, 18, 614.ADSCrossRefGoogle Scholar
  7. Doroshkevich A.G., Longair M.S. and Zeldovich Ya.B., 1970. Mon. Not. R. astr. Soc., 147, 139.ADSGoogle Scholar
  8. Gull S.F. and Northover K.J.E., 1976. Nature (in press).Google Scholar
  9. Romberg B.V. and Sunyaev R.A., 1971. Astron. Zh., 48, 235.ADSGoogle Scholar
  10. Longair M.S. and Sunyaev R.A., 1969. Nature, 223, 719.ADSCrossRefGoogle Scholar
  11. Parijskij Yu.N., 1972. Astron. Zh., 49, 1322.ADSGoogle Scholar
  12. Parijskij Yu.N., 1973. Astron. Zh., 50, 453.ADSGoogle Scholar
  13. Peebles P.J.E., 1968. Astrophys. J., 162, 815.ADSCrossRefGoogle Scholar
  14. Peebles P.J.E. and Yu, I.T., 1970. Astrophys. J., 162, 815.ADSCrossRefGoogle Scholar
  15. Silk J., 1968. Astrophys. J., 151, 459.ADSCrossRefGoogle Scholar
  16. Stankevich K.S., 1974. Astron. Zh., 51, 216.ADSGoogle Scholar
  17. Sunyaev R.A. and Zeldovich Ya.B., 1970. Astrophys. and Space Science, 7, 20.ADSGoogle Scholar
  18. Sunyaev R.A. and Zeldovich Ya.B., 1972. Comments Astrophys. and Sp. Phys., 4, 173.ADSGoogle Scholar
  19. Weinberg S., 1972. “Gravitation and Cosmology”, Wiley, New York.Google Scholar
  20. Zeldovich Ya.B., Kurt V.G. and Sunyaev R.A., 1968. ZTP., 55, 278.Google Scholar

Copyright information

© International Astronomical Union 1977

Authors and Affiliations

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

Personalised recommendations