Probing Environment of AGNs based on their feedback processes

Abstract

It is broadly accepted that the presence of a supermassive black hole (SMBH) at the center of an active galaxy is not merely triggering the mass accretion onto it but may play a crucial role in predicting the final evolution of its host galaxy. The generation of energy via accretion of surrounding matter onto the SMBH, known as Active Galactic Nucleus (AGN) feedback, in the form of winds/outflows or jets, can interact with the stellar environment of its host and may set o the heating, compression or expulsion of the gases residing in the host galaxy. The two main modes of the AGN feedbacks are the radiative mode and kinetic mode. The radiative mode occurs in highly luminous sources, delivering high radiation pressure and hence resulting in the ejection of gases in the form of strong outflows. On the other hand, the kinetic mode scenario is perhaps due to the radio jets mainly occurring in low luminous AGNs. In this thesis, we study these modes of the AGN feedback to understand the dynamics of the gases in the central region of the AGN as well as the metal enrichment of the IGM. We have performed a detailed photometric and spectroscopic analysis for the continuum variability and absorption/emission line study of the AGNs to address some serious questions in this field.