X-Ray Variability and Spectral Scaling: A Measure of BLR Sizes in AGN

  • A. Wandel
  • Th. Boller
Part of the Astrophysics and Space Science Library book series (ASSL, volume 218)


We developed a new method of determination of the size of the broad emission-line region (BLR) in active galactic nuclei. This method relates the radius of the broad-line region of AGN to the soft X-ray luminosity and spectral index. Comparing the BLR distances calculated from our model to the BLR distances determined by reverberation mapping shows that our scaling law agrees with the R ~ L 1/2 empirical relation. Here we investigate a complimentary method of estimating the BLR distance — based on the Keplerian broadening of the emission lines and the central mass estimated from X-ray variability.


Emission Line Central Mass Spectral Index Active Galactic Nucleus Black Hole Mass 
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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • A. Wandel
    • 1
  • Th. Boller
    • 2
  1. 1.Racah Inst.The Hebrew UniversityJerusalemIsrael
  2. 2.Max Planck Inst. fuer ExtraterrPhysik, GarchingGermany

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