ANALYSIS OF LENS REDSHIFT PROBABILITY DISTRIBUTION USING STRONG GRAVITATIONAL LENS SAMPLES IN THE DETERMINATION OF COSMOLOGICAL PARAMETERS AND GALAXY EVOLUTION PARAMETERS

• Main Author: Indra Arwinata, Hafiz
• Format: Final Project
• Language: Indonesia
• Subjects: Astronomi
• Online Access: https://digilib.itb.ac.id/gdl/view/79935
• Institution: Institut Teknologi Bandung

A fundamental aspect of studying the universe is measuring its cosmological parameters. Concurrently, a comprehensive understanding of the evolution of galaxy mass and number density is important in studying the universe. In this final project, we use lens redshift probability distribution analysis to constrain the cosmological parameters and galaxy evolution using 171 strong gravitational lensing systems. Furthermore, the sample is grouped into eight groups based on ?E, source galaxy type, and morphological type of the lensing galaxy. In this analysis, we assume a simple lens mass distribution that represents an isolated lens system and it is performed on the ?CDM and wCDM universe models. Both models are accompanied by variations of three galaxy evolution states, namely non-evolving galaxies, power-law evolving galaxies, and exponentially evolving galaxies. Furthermore, we performed further analysis using data from the H0LiCOW research project to study isolated lens systems based on velocity dispersion data. The analysis of the lens redshift probability distribution reveals that, in general, the data used in this final project provide cosmological parameter values that are consistent with the H0LiCOW study. Meanwhile, the galaxy evolution parameter values obtained are quite consistent with the references used. Based on these results, ?E is not very e?ective for identifying isolated lens systems, but velocity dispersion can be used to identify isolated lens systems after being corrected for ?text and ?ap. Future improvements in the quality and quantity of gravitational lensing data are expected to provide better constraints on cosmological parameters and galaxy evolution.