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Journal of Physical Studies 16(3), Article 3904 [8 pages] (2012)
DOI: https://doi.org/10.30970/jps.16.3904 SIMULATIONS OF THE GRAVITATIONAL MICROLENSING: EXTENDED SOURCE MODELS AND IMPACT OF BINARY STARSV. M. Sliusar, V. I. Zhdanov, A. N. Alexandrov
Astronomical Observatory, Taras Shevchenko National University of Kyiv, |
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In the extragalactic gravitational lens system several images of a distant quasar are observed through a foreground galaxy. The observation of light curves of different quasar images provides an important information about the central quasar region. We perform statistical simulations of the light curves of the microlensed images to estimate a feasibility to distinguish source models with different brightness profiles. Two cases of mass distribution in the foreground lensing galaxy are studied: (i) random distribution of stars represented by single point masses and (ii) analogous distribution of double stars. We found that the difference between light curves for the accretion disk and Gaussian source model of the same radius can reach up to 8\ 0n some cases. If we fit the accretion disk and the limb darkening source models with the Gaussian surface brightness profile and the size is allowed to be not the same, then that this difference can be decreased to 7\% and 2.6\%, respectively. A comparison of the results shows that the difference between cases (i) and (ii) is at the limit of statistical relevance, though some light curves may differ considerably.
PACS number(s): 98.62.Sb