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The Evolution of QSO Spectra: Evidence for Microlensing?

Published online by Cambridge University Press:  25 May 2016

Paul J. Francis  and
Anuradha Koratkar
Paul J. Francis
Affiliation:
School of Physics, University of Melbourne Parkville, Victoria 3054, Australia E-mail: pjf@physics.unimelb.edu.au
Anuradha Koratkar
Affiliation:
Space Telescope Science Institute 3700 San Martin Drive, Baltimore, MD 21218, USA E-mail: koratkar@stsci.edu

Abstract

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We find that the spectra of QSOs evolve: high redshift QSOs (z > 1.5) have lower equivalent width emission lines than low redshift QSOs (z < 0.5) with the same luminosities and radio properties.

We propose that microlensing by compact objects may account for the apparent evolution. If Ω ∼ 0.05 in compact objects, the continuum emission from many high redshift QSOs will be amplified, but not the line emission, leading to the observed decrease in the apparent equivalent widths.

Information

Type
Chapter 8: Quasar Structure & Microlensing
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 289 - 290
Copyright
Copyright © Kluwer 1996 

References

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