Volume 380, Number 2, December III 2001
|Page(s)||805 - 810|
|Section||Section $secnum inconnue|
|Published online||15 December 2001|
A novel approach for extracting time-delays from lightcurves of lensed quasar images
Institut d'Astrophysique et de Géophysique, Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium e-mail: firstname.lastname@example.org; email@example.com
2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: firstname.lastname@example.org
3 Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark e-mail: email@example.com
Corresponding author: I. Burud, firstname.lastname@example.org
Accepted: 15 October 2001
We present a new method to estimate time delays from light curves of lensed quasars. The method is based on 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.
Key words: methods: data analysis / gravitational lensing
© ESO, 2001
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