The Universe behind the Milky Way |
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| Authors: | Renée C Kraan-Korteweg Ofer Lahav |
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| Institution: | (1) Depto. de Astronomía, Universidad de Guanajuato, Apartado Postal 144, Guanajuato GTO 36000, Mexico, MX;(2) Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK, GB |
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| Abstract: | Summary. 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 and b.
Received 4 April 2000 / Published online 18 July 2000 |
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| Keywords: | : zone of avoidance – surveys – clusters – large-scale structure of Universe – ISM: dust extinction |
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