Separating Intrinsic and Microlensing Variability using Parallax Measurements

  • Stein Vidar Hagfors Haugan
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 173)


In gravitational lens systems with 3 or more resolved images of a quasar, the intrinsic variability may be unambiguously separated from the microlensing variability through parallax measurements from 3 observers when there is no relative motion of the lens masses (Refsdal 1993). In systems with fewer than 3 resolved images, however, this separation is not straightforward. For the purpose of illustration, I make the following simplifications for the one-dimensional case: The observations consist of well-sampled time series of the observed flux F A (t i ) and F B (t i ) at two points in the observer plane. The separation vector of the two points is parallel to the direction of the transverse motion of the source-lens-observer system, and the distance D AB between the observers is known. Furthermore, the distance D AB small compared to the typical length scale of fluctuations in the magnification μ(x).


Characteristic Scale Transverse Motion Intrinsic Variability Gravitational Lens Astrophysical Application 
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  1. Refsdal, S. 1993, in Gravitational Lenses in the Universe, eds. Surdej et al., Université de Liège, BelgiumGoogle Scholar

Copyright information

© International Astronomical Union 1996

Authors and Affiliations

  • Stein Vidar Hagfors Haugan
    • 1
  1. 1.Institute of Theoretical AstrophysicsUniversity of OsloOsloNorway

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