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Comparison between Optically Selected and X-Ray Selected Active Galactic Nuclei

  • A. Franceschini
  • I. M. Gioia
  • T. Maccacaro
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 121)

Abstract

We compare statistical properties on optically selected and X-ray selected Active Galactic Nuclei by using the available data on the corresponding distributions of the X-ray to optical luminosity ratio. We show that these computations critically depend on the width of these distributions. The use of the observed ones leads to significant inconsistencies between predictions and observations. However, if we assume that these distributions have boon “broadened” by external effects, and consequently we use narrower intrinsic widths, we can eliminate most of the discrepancies.

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Copyright information

© Springer Science+Business Media Dordrecht 1986

Authors and Affiliations

  • A. Franceschini
    • 1
  • I. M. Gioia
    • 2
    • 3
  • T. Maccacaro
    • 2
    • 3
  1. 1.Vicolo OsservatorioIstituto di AstronomiaPadovaItaly
  2. 2.Center for AstrophysicsCambridgeUSA
  3. 3.Istituto di RadioastronomiaCNRBolognaItaly

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