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The Quasar Luminosity Function

Published online by Cambridge University Press:  25 May 2016

Paul C. Hewett
Paul C. Hewett*
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom

Abstract

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Recent results at high redshifts are briefly reviewed. An analysis of the evolution of the quasar luminosity function based on the recently published Hawkins & Véron (1995) variability-selected quasar sample is presented. The results support the conclusions of earlier work that suggested the simple two power law luminosity function, of invariant shape as a function of redshift, requires some modification in order to match the data. However, the contention of Hawkins & Véron that a single power law model provides an adequate fit to the variability-selected quasar sample and that there is no requirement for curvature in the form of the quasar luminosity function is not borne out by the analysis.

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