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Complete Samples of Variable Quasars

Published online by Cambridge University Press:  19 July 2016

M.R.S. Hawkins
M.R.S. Hawkins*
Affiliation:
Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, Scotland

Abstract

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The merits of selecting samples of quasars for statistical analysis on the basis of optical variability is discussed. Samples selected this way are essentially uncontaminated by spurious objects, and contain no serious redshift biasses. A preliminary sample from a long term survey suggests a timescale of variation for quasars of about four years, and indicates a fall off in numbers at around B = 20.

Type
Chapter XI: Quasi-Stellar Objects: Distribution and General Properties
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 691 - 694
Copyright
Copyright © Reidel 1987 

References

Hawkins, M.R.S., 1986. Mon. Not. R. astr. Soc. 219, 417.Google Scholar