Description
This thesis explores the properties of galaxy clusters and Active Galactic Nuclei
(AGNs) using newly available data from the eROSITA Final Equatorial Depth survey,
three fields of the Galaxy And Mass Assembly survey (G09, G12, and G15), and the
DESI Legacy survey, focusing on how these properties depend on, or are influenced by
their surrounding galactic environments and X-ray flux levels. The goal is to deepen our
understanding of AGN behavior in different cosmic contexts and to investigate the role
of environmental factors in their formation and evolution.
To achieve this, we use a range of analytical techniques, including measuring galaxy
environments and utilizing two-point correlation functions to assess spatial distributions.
An important aspect of the research involves cross-matching optical and X-ray catalogues
to accurately identify AGN counterparts. We also stack spectra based on environmental
parameters and perform spectral energy distribution (SED) fitting to correlate optical
spectra with X-ray flux.
Additionally, the study examines how AGNs cluster in different environments, aiming to develop a theoretical model that explains these environmental dependencies. The results of this work will enhance our understanding of the relationship between AGN activity and their environments, offering new perspectives on galaxy formation and evolution. This research lays the groundwork for further exploration into the complex interactions governing AGN and their role within the broader cosmic landscape.
Keywords: Galaxy clusters, Large scale structure, Active Galactic Nuclei
