Fluctuations in the Microwave Background Radiation

Abstract

FLUCTUATIONS in the microwave background radiation are expected as a result of perturbations in the primaeval plasma from which large-scale structures such as galaxies and clusters of galaxies were formed. So far there are only upper limits to the observed values of such fluctuations, of roughly δT/T 10−3 (refs. 1–3 and Pariisky and Pyatynina at the Riga conference on radio astronomy, August 1968) on scales greater than about 3′. The background radiation at centimetre and millimetre wavelengths also contains contributions from unresolved discrete sources and diffuse matter. Here we compare the magnitudes of the temperature fluctuations δT/T expected as a result of “primaeval” perturbations with several other possible sources of fluctuations, particularly discrete radio sources. The latter are likely to be much more important than “primaeval” fluctuations on scales less than 3′ at all wavelengths.

Access options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Conklin, E. K., and Bracewell, R. N., Nature, 216, 777 (1967).

  2. 2

    Conklin, E. K., and Bracewell, R. N., Phys. Rev. Lett., 18, 614 (1967).

  3. 3

    Wilkinson, D. T., and Partridge, R. B., Nature, 215, 719 (1967).

  4. 4

    Lifshitz, E. M., J. Phys. USSR, 10, 116 (1946).

  5. 5

    Silk, J., Astrophys. J., 151, 459 (1968); Nature, 218, 453 (1968); ibid. 215, 1155 (1967).

  6. 6

    Doroshkevitch, A. G., and Zeldovich, Ya. B., Astron. J. USSR, 40, 807 (1963).

  7. 7

    Weymann, R., Astrophys. J., 145, 560 (1966).

  8. 8

    Zeldovich, Ya. B., Kurt, V. G., and Sunyaev, R. A., Zh. Exp. Theor. Fiz. JETP, 55, 278 (1968). Peebles, P. J. E., Astrophys. J., 153, 1 (1968).

  9. 9

    Zeldovich, Ya. B., and Sunyaev, R. A., Astrophys. Space Sci. (in the press).

  10. 10

    Sachs, R. K., and Wolfe, A. M., Astrophys. J., 147, 73 (1967).

  11. 11

    Zeldovich, Ya. B., and Sunyaev, R. A., Astrophys. Space Sci. (in the press). Nature, 223, 721 (1969).

  12. 12

    Scheuer, P. A. G., Proc. Camb. Phil. Soc., 53, 764 (1957).

  13. 13

    Hewish, A., Mon. Not. Roy. Astron. Soc., 123, 167 (1961).

  14. 14

    Pooley, G. G., and Ryle, M., Mon. Not. Roy. Astron. Soc., 139, 515 (1968).

  15. 15

    Doroshkevitch, A. G., Longair, M. S., and Zeldovich, Ya. B., Astrophys. Lett. (in the press).

  16. 16

    Caswell, J. L., and Wills, D., Mon. Not. Roy. Astron. Soc., 135, 231 (1967).

  17. 17

    Pooley, G. G., Nature, 218, 153 (1968).

  18. 18

    Shimmins, P., Bolton, J. G., and Wall, J. V., Nature, 217, 818 (1968).

  19. 19

    Wagoner, R., Astrophys. J., 149, 465 (1967).

  20. 20

    Pariisky, Yu. N., A. J. USSR, 45, 2 (1968).

  21. 21

    Low, F. J., and Tucker, W. H., Phys. Rev. Lett., 21, 1538 (1968).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

LONGAIR, M., SUNYAEV, R. Fluctuations in the Microwave Background Radiation. Nature 223, 719–721 (1969). https://doi.org/10.1038/223719a0

Download citation

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.