Radio Galaxies and Quasars, I

Invited Discourse C given on August 28, 1967 in the Lucerna Hall
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUH, volume 1)


If we observe the sky with a radio telescope operating at metre wavelengths, we find first a continuous background mainly due to the Milky Way — which we observe undimmed by the obscuration which spoils our optical view. In addition we find compact sources, a few minutes of arc or less in extent. About 8000 of these compact sources have now been discovered using large instruments, but only a few hundred of the most intense have been studied in any detail; a few are within our Galaxy and represent the emission from the remnants of supernova explosions, but many of them are found to be associated with faint galaxies. From their distances we can conclude that their radio emission is very great, in some cases more than a million times greater than that from our own Galaxy or the Andromeda nebula. These powerful sources are known as ‘radio galaxies’.


Radio Emission Radio Source Radio Galaxy Plasma Cloud Compact Source 
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Copyright information

© I.A.U. 1968

Authors and Affiliations

  1. 1.University of CambridgeEngland

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