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Turkish Journal of Physics

Abstract

In strong gravitational lensed quasars, the magnification of an image is significant for constraining various lens models. We predict the magnification of the lensed images in the case of double lensed quasars that are expected to be observed by the Roman Space Telescope. Using Monte Carlo simulations, we generate quasar-galaxy systems based on the mass-luminosity function of galaxies and the redshift distribution of both galaxies and quasars taken from observations. Utilizing the capabilities of the Roman Telescope, we calculate for the double lensed quasars their angular positions and their magnifications. We considered two models for the lensing galaxy: the singular isothermal sphere (SIS) and the nonsingular isothermal sphere (NIS), which are spherically symmetric lenses without and with a core, respectively. For these circularly symmetric lens models, we verified that the sum of the signed magnifications of images is invariant. Moreover, we discovered a linear relationship between the magnification ratio of the two images, µ(θ1)/|µ(θ2)| and their angular position ratio θ1/|θ2|. Furthermore, we concluded that on a log-log scale, as the core radius of the NIS galaxy increases, the ratio of the magnification and the angular position decreases. The analysis of the lensed quasars provides a way to test the mass distribution models and the evolution of galaxies, offering significant insights into astrophysics.

Author ORCID Identifier

ESMERALDA GULIQANI: 0009-0002-1854-9213

LINDITA HAMOLLI: 0000-0001-5075-8205

MIMOZA HAFIZI: 0000-0002-5510-6107

DOI

10.55730/1300-0101.2783

Keywords

Quasar, galaxy, strong lensing, magnification

First Page

169

Last Page

180

Publisher

The Scientific and Technological Research Council of Türkiye (TÜBİTAK)

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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