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P69 |
November
2001
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To be published in:
Astronomy & Astrophysics
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A novel approach for extracting time-delays from lightcurves
of lensed quasar images.
Ingunn Burud,
1,2,
Pierre Magain,
1,
Sandrine Sohy,
1,
Jens Hjorth
3
1 Institut d'Astrophysique et de Géophysique de
Liège, Avenue de Cointe 5, 4000 Liège, Belgium
2 Space Telescope Science Institute, 3700 San Martin Drive,
Baltimore, MD 21218, USA
3 Astronomical Observatory, University of Copenhagen, Juliane
Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
We present a new method to estimate time delays from light
curves of lensed quasars. The method is based on
2 minimization
between the data and a numerical model light curve. A linear variation
can be included in order to correct for slow long-term microlensing
effects in one of the lensed images. An iterative version of the
method can be applied in order to correct for higher order
microlensing effects. The method is tested on simulated light curves.
When higher order microlensing effects are present the time
delay is best constrained with the iterative method. Analysis of
a published data set for the lensed double Q~0957+561 yields results in
agreement with other published estimates.
Methods: data analysis - Gravitational lensing.
A complete HTML version is available on the
"
Deconvolution of gravitational lenses" Page
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