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Information × Registration Number 0217U001230, 0116U000829 , R & D reports Title Investigations of gravitational lenses: cosmological parameters and physics of extragalactic objects popup.stage_title Head Olexandr Zheleznyk, Registration Date 31-01-2017 Organization Kharkov National University named after V.N. Karazin popup.description2 The object of study - the phenomenon of gravitational lens, quasars and active galaxy nuclei. The goal of research - to obtain the new astrophysical and cosmological information including investigation of objects created by gravitational lensing. This information is needed to clarify parameters of the model of the Universe and understanding of the physical properties of its individual structures and objects. Methods of research - theoretical consideration and computer simulations, photometry and spectrophotometry in the optical range, the statistical analysis. The light propagation through an optically-thick medium of lens galaxy had been considered, taking into account a pairs of point-mass stars, separated by a significant distance along the line of sight. It is shown that in framework of this model a noticeable increase of scattering of quasar radiation is possible. The helicity of a thin toroidal vortex in the presence of torsion had been considered. It is shown that relation of the helicity with circulations along the guide and forming of torus depends on the distribution of the azimuthal velocity in the core of a swirling vortex ring. In the case of an inhomogeneous torsion this relationship is different from the known Moffat relationship. With the use of the new method of analysis of lightcurves of lensed quasar components an improved estimation of time delay for Q2237+0305 system with absolute errors better than ± 2 days had been obtained. An algorithm for the search of gravitationally lensed quasars in the Sloan digital sky survey database was developed and implemented, particularly, the new double gravitationally lensed quasar SDSS J1442+4055 was discovered. Product Description popup.authors O. Кочетов І. Сінельніков В. Конічек В. Цвєткова Л. Бердіна О. Баннікова О. Железняк О. Сергєєв popup.nrat_date 2020-04-02 Close