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The Angular Diameter-Redshift Relation for Scintillating Radio Sources

Published online by Cambridge University Press:  14 August 2015

A. Hewish ,
A. C. S. Readhead  and
P. J. Duffett-Smith
A. Hewish
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE.
A. C. S. Readhead
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE.
P. J. Duffett-Smith
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE.

Extract

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Observational evidence on the angular diameter-redshift relation using radio sources has, until recently, been confined to studies of the overall angular size. In this paper a different approach is described in which the very compact hot spots in radio sources are used as standard measuring rods. Such hot spots appear to be especially suitable for cosmological studies for the following reasons.

  1. (a) Hot spots which contain one half or more of the total flux density are generally found only in the most powerful sources (P178 ≳ 1027 W Hz−1 sr−1).

  2. (b) Hot spots appear to show a smaller dispersion in physical size than the overall source dimensions.

Type
III. Angular Diameter-Redshift and Flux Density Tests
Information
Symposium - International Astronomical Union , Volume 74: Radio Astronomy and Cosmology , 1977 , pp. 139 - 147
Copyright
Copyright © Reidel 1977 

References

Hewish, A. & Readhead, A.C.S., 1976, Astrophysl Letters (in press)Google Scholar
Readhead, A.C.S., & Hewish, A., 1976, Mon.Not.R.astr.Soc. (in press)Google Scholar
Swarup, G. & Bhandari, S.M., 1976, Astrophys. Letters, 17, 31.Google Scholar