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Interpretation of Source Counts and Redshift Data in Evolutionary Universes

Published online by Cambridge University Press:  14 August 2015

J. V. Wall ,
T. J. Pearson  and
M. S. Longair
J. V. Wall
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Cambridge, England
T. J. Pearson
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Cambridge, England
M. S. Longair
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Cambridge, England

Extract

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Conventional interpretation of the N(S) relation requires cosmic evolution of the radio source population. Investigators agree on the general features of this evolution: it must be confined to the most luminous sources, and must be strong, the numbers of such sources at redshifts of 1 to 4 exceeding the present numbers by a factor ≳103. There is no consensus as to whether density or luminosity evolution prevails (or both), whether a cutoff in redshift is necessary, or whether the source populations found in high-frequency surveys follow even the general evolutionary picture deduced for the low-frequency survey population. It is therefore hardly surprising that the physical basis of the evolution, the ultimate goal of N(S) interpretation, remains largely “in the realm of imaginative speculation” (P. A. G. Scheuer).

Type
V. Interpretation of Cosmological Information on Radio Sources
Information
Symposium - International Astronomical Union , Volume 74: Radio Astronomy and Cosmology , 1977 , pp. 269 - 277
Copyright
Copyright © Reidel 1977 

References

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