The Space Density of High-Redshift Quasars

  • P. A. Shaver
  • J. V. Wall
  • K. I. Kellermann
  • C. Jackson
  • M. R. Hawkins
Conference paper
Part of the International Astronomical Union book series (IAUS, volume 175)

Abstract

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.

Keywords

Radio Source High Redshift Space Density Lower Redshift Royal Greenwich Observatory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© International Astronomical Union 1996

Authors and Affiliations

  • P. A. Shaver
    • 1
  • J. V. Wall
    • 2
  • K. I. Kellermann
    • 3
  • C. Jackson
    • 4
  • M. R. Hawkins
    • 5
  1. 1.European Southern ObservatoryGarchingGermany
  2. 2.Royal Greenwich ObservatoryCambridgeEngland
  3. 3.National Radio Astronomy ObservatoryCharlottesvilleUSA
  4. 4.Institute of AstronomyUniversity of CambridgeEngland
  5. 5.Royal ObservatoryEdinburghUK

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