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Microlensing Induced Spectral Variability In Q2237+0305

Published online by Cambridge University Press:  25 May 2016

Geraint F. Lewis ,
Mike J. Irwin  and
Paul C. Hewett
Geraint F. Lewis
Affiliation:
Institute of Astronomy, Cambridge. UK
Mike J. Irwin
Affiliation:
Royal Greenwich Observatory, Cambridge. UK
Paul C. Hewett
Affiliation:
Institute of Astronomy, Cambridge. UK

Abstract

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The degree of microlensing induced amplification is dependent upon the size of a source. As quasar spectra consist of the sum of emission from different regions this scale dependent amplification can produce spectral differences between the images of a macrolensed quasar. This paper presents the first direct spectroscopic evidence for this effect, providing a limit on the scale of the continuum and the broad line emission regions at the center of a source quasar (2237+0305). Lack of centroid and profile differences in the emission lines indicate that substructure in the broad emission line region is > 0.05 parsecs.

Type
Chapter 8: Quasar Structure & Microlensing
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 241 - 246
Copyright
Copyright © Kluwer 1996 

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