Smirnov G. Quasar structure in gravitationally-lensed system Q2237+0305 (Einstein Cross) from results of observations in the optical range

Object of research - the phenomenon of gravitational microlensing. The purpose of the work is obtaining of the new information about the structure and the sizes of source in GLS Q2237+0305, as well as about the characteristics of the lens galaxy from the analysis of microlensing lightcurves in this system. Methods of research - multicolor optical observations, computer simulation of microlensing processes and statistical estimation of parameters of observational lightcurves. With the use of 2001-2008 multicolor observations, the lightcurves of components of GLS Q2237+0305 are obtained. The analysis of model of the quasar which consists of two characteristic structures - a compact part (accretion disk) and extended structure is carried out. It is shown the better correspondence of the two-component source model to results of observations of GLS Q2237+0305 in a spectral band V (OGLE II project). For the first time is shown the conformity of the proposed two-component model of a source to the data of multicolor observations. The estimates of the relative energy contribution of extended structure in the general radiation of a quasar in spectral bands V, R and I are received. The size of a compact part of a source, and characteristic microlens masses are estimated. For the first time the distributions of probabilities of microlensing for this object are obtained.