Abstract Details

Name: Sonali Sachdeva
Affiliation: Post Doctoral Fellow, IUCAA
Conference ID: ASI2017_481
Title : An investigation of galaxy morphology tools and application to high redshift galaxies
Authors and Co-Authors : Supervisor: Prof. H.P. Singh, University of Delhi, Delhi
Abstract Type : Thesis
Abstract Category : Thesis
Abstract : More than 97% of the galaxies observed in the local Universe can be broadly classified to have an elliptical or spiral structure. However, almost all the distant galaxies, i.e, more than 8 billion light years away, are observed to have irregular and peculiar structure. Examining the development of galaxies from irregular morphologies at earlier times (~6 billion years) to the present epoch (13.7 billion years), where they have settled into few distinctly identifiable categories, is critical to understand the major physical processes involved in galaxy formation and evolution. In this thesis work, this work has been undertaken using data from latest telescopes and surveys. Presence of disc galaxies in the Universe which do not have any merger remnant (or bulge) in their centre, challenge the accepted hierarchical model of galaxy formation that is based on continuous mergers and violent interactions. The reason for their survival has been examined by studying the evolution in their various defining parameters. Additionally, efforts have been made to obtain insight into the relative role of internally and externally driven processes in the growth of bulges in disc galaxies from z~1 to the present epoch. Their role is important to be established to understand the presence of disc galaxies of varied bulge types in the local Universe. This work has been carried out in the optical as well as infrared wavelengths.