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Radio-Source Evolution and the Redshift Cut-Off

Published online by Cambridge University Press:  04 August 2017

J. A. Peacock
J. A. Peacock*
Affiliation:
Royal Observatory, Edinburgh

Extract

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The idea that there may be a cut-off in the distribution of quasars at high redshifts (z∼4) has been of some recent interest through the work of Osmer (1982). The observation of such an epoch of quasar creation is potentially of great importance in relation to theories of galaxy formation, but the evidence from optically-selected quasar samples remains uncertain: quite apart from the notorious problems in achieving quantifiable completeness in objective-prism surveys, any observed lack of high-redshift quasars may always be attributed to absorption either by a neutral IGM or by dust in intervening galaxies. Radio-selected samples, however, do not suffer from these problems, and this paper aims to review what studies of extragalactic radio sources can tell us about the numbers of objects at the highest redshifts.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 104: Early Evolution of the Universe and Its Present Structure , 1983 , pp. 43 - 45
Copyright
Copyright © Reidel 1983 

References

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