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Quasar Surveys

Published online by Cambridge University Press:  19 July 2016

M. G. Smith
M. G. Smith*
Affiliation:
United Kingdom Infrared Telescope, Hawaii Headquarters, 665 Komohana Street, Hilo, Hawaii, U.S.A.

Abstract

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A review is given of progress in surveys for quasars at frequencies from radio to x-ray. Radio results show evidence for a decline in the radio luminosity function for flat-spectrum radio sources at redshifts z > 2. The IRAS survey is uncovering hitherto unknown dusty Seyfert galaxies. Optical surveys, which yield the largest number of QSOs per square degree, may suffer from selection effects which depend on intrinsic luminosity, redshift, and spectral evolution - particularly above redshift 2. Below redshifts of about 2.3, the optical magnitude-redshift plane is being filled in to the point where the evolution of the luminosity function can be seen directly. The statistics of quasar pair separations provide the best evidence so far for quasar clustering.

The existence of many potentially significant selection effects means that a multi-frequency approach to quasar surveys is likely to prove essential to an understanding of the evolutionary behaviour of the quasar population as a whole.

Type
I. Surveys
Information
Symposium - International Astronomical Union , Volume 119: Quasars , 1986 , pp. 17 - 32
Copyright
Copyright © Reidel 1986 

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