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The Space Density of High-Redshift Quasars

Published online by Cambridge University Press:  25 May 2016

P.A. Shaver ,
J.V. Wall ,
K.I. Kellermann ,
C. Jackson  and
M.R. Hawkins
P.A. Shaver
Affiliation:
1 European Southern Observatory - Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
J.V. Wall
Affiliation:
2 Royal Greenwich Observatory - Madingley Road, Cambridge CB3 0EZ, England
K.I. Kellermann
Affiliation:
3 National Radio Astronomy Observatory - Edgemont Road, Charlottesville, VA 22903, U.S.A.
C. Jackson
Affiliation:
4 Institute of Astronomy - University of Cambridge, Madingley Road, CB3 0HA, England
M.R. Hawkins
Affiliation:
5 Royal Observatory - Blackford Hill, Edinburgh EH9 3HJ, Scotland

Abstract

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An upper limit on the space density of quasars at z > 5 is obtained independent of any optical magnitude limit, from the complete identification of a large sample of flat-spectrum radio sources. This upper limit is below the observed space density at z ≃ 2 − 3, showing that the turnover in space density is real and not merely due to obscuration.

Type
Cosmological Implications
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 561 - 562
Copyright
Copyright © Kluwer 1996