| Abstract : |
A large number of observations, ranging from X-ray studies of galaxy clusters to observing correlations between supermassive black hole (SMBH) with their host galaxies, shows that Active Galactic Nuclei (AGN) plays important role in the evolution of large scale structure in the universe. Here we explore the influence of AGN feedback on their surrounding medium and study the cosmological evolution of AGN along with their host dark matter halos and galaxies using cosmological volume simulation that includes dark matter dynamics, hydrodynamics, star formation along with a subgrid modelling of black hole formation and associated feedback. We investigate various correlated properties of AGN-host galaxies and explain those in terms of feedback from the AGN. We show that AGN feedback evacuates gas in the ambient medium, resulting in a deficit of the cold gas supply, which in turn suppresses the black hole growth and star formation. Moreover, we model X-ray emission from galaxy groups and clusters and develop a promising technique of synthetic X-ray observation to compare the theoretical results with observations. We find that X-ray emission from the diffuse gas surrounding the black holes in the presence of AGN feedback reveals a suppression in the X-ray surface brightness profile which agrees with the result observations. Finally, we aim to establish the robustness of our results by comparing them with the results of a different cosmological simulation. We show that galaxy, black hole and X-ray properties of individual systems in both the simulations agree well with each other. We further show that different modes of feedback might have substantially different effect on the galaxy and gas properties for AGN host galaxies. Finally, we propose new observations with current and upcoming X-ray telescopes to investigate the effect of AGN feedback in the high redshift universe. |
