The Astronomy and Astrophysics Review

, Volume 10, Issue 3, pp 211–261 | Cite as

The Universe behind the Milky Way

  • Renée C. Kraan-Korteweg
  • Ofer Lahav


Due to the foreground extinction of the Milky Way, galaxies appear increasingly fainter the closer they lie to the Galactic Equator, creating a “zone of avoidance” of about 25% in the distribution of optically visible galaxies. A “whole-sky” map of galaxies is essential, however, for understanding the dynamics in our local Universe, in particular the peculiar velocity of the Local Group with respect to the Cosmic Microwave Background and velocity flow fields such as in the Great Attractor region.

Various dynamically important structures behind the Milky Way have only recently been made “visible” through dedicated deep surveys at various wavelengths. The wide range of observational searches (optical, near infrared, far infrared, radio and X-ray) for galaxies in the Zone of Avoidance are reviewed, including a discussion on the limitations and selection effects of these partly complementary approaches. The uncovered and suspected large-scale structures are summarized. Reconstruction methods of the density field in the Zone of Avoidance are described and the resulting predictions compared with observational evidence. The comparison between reconstructed density fields and the observed galaxy distribution allow derivations of the density and biasing parameters \(\Omega_0\) and b.

Key words: zone of avoidance – surveys – clusters – large-scale structure of Universe – ISM: dust, extinction 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Renée C. Kraan-Korteweg
    • 1
  • Ofer Lahav
    • 2
  1. 1.Depto. de Astronomía, Universidad de Guanajuato, Apartado Postal 144, Guanajuato GTO 36000, MexicoMX
  2. 2.Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UKGB

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