Computer Science
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..445s&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Computer Science
Scientific paper
In spite of the gravitational amplification does not depend on a wavelength multiple images of a gravitational lensed quasar often have different colors. There are two possible reasons for that fact: 1) the different extinction in a lensing galaxy along lines of sights to quasar images and 2) small-scaled gradients of the gravitational field produced by stars in a lensing galaxy (microlensing) are able to amplify different parts of the quasar accretion disk for different amount. Those two effects can be distinguished from their dependencies on wavelength for variable gravitational lensed systems. We analyze light curves of the quadruple gravitational lensed quasar Q2237+0305 in VRI bands for last decade and argue that color variation in that system are produced by microlensing. Color-to-color diagram C[VR]-C[VI] allows to estimate the ratio of accretion disk sizes for different wavelengths and compare it with the prediction of theoretical models.
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