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Clustering of Galaxies about Extragalactic Radio Sources-Implications for Observations with the Einstein X-Ray Observatory

Published online by Cambridge University Press:  30 March 2016

M. S. Longair  and
M. Seldner
M. S. Longair
Affiliation:
Milliard Radio Astronomy Observatory, Cavendish Laboratory, Cambridge, England.
M. Seldner
Affiliation:
Joseph Henry Laboratories, Princeton University, Princeton, USA

Extract

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The question which we have addressed is “what is the clustering of galaxies about extragalactic radio sources and how does it vary with the properties of the sources such as radio luminosity, optical spectral properties, radio morphology, etc”. Only a small fraction of strong radio sources belong to rich clusters and most of the work on weaker associations is of a somewhat subjective nature. Our approach has been to work with complete, statistically defined samples of bright radio sources and to cross-correlate the positions of the sources with the Lick counts of galaxies. In this approach, we never define exactly what we mean by a cluster as group of galaxies - clustering is simply defined as the amplitude of a correlation function. This approach is only possible because the Lick counts of galaxies have been studied in detail by Seldner et al. (1977) who calibrated the Lick counts over the whole of the sky.

Type
Joint Discussion
Information
Highlights of Astronomy , Volume 5: Highlights of Astronomy. As presented at the XVIIth General Assembly of the IAU, 1979 , 1980 , pp. 723 - 726
Copyright
Copyright © Cambridge University Press 1980

References

Hine, R.G. and Longair, M.S.: 1979, Mon. Not. R. Astr. Soc. 188, 111.CrossRefGoogle Scholar
Longair, M.S. and Seidner, M.: 1979, Mon. Not. R. Astr. Soc. in press.Google Scholar
Riley, J.M. and Longair, M.S.: 1979, Mon. Not. R. Astr. Soc. in press.Google Scholar
Seidner, M., Siebers, B., Groth, E.J. and Peebles, P.J.E.: 1977, Astron. J. 82, 249.CrossRefGoogle Scholar