Unit:
Κατεύθυνση Αστροφυσική, Αστρονομία και Μηχανική (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Author:
Dimopoulos Georgios
Supervisors info:
Μαστιχιάδης Απόστολος, Καθηγητής, Τμήμα Φυσικής, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Γεωργαντόπουλος Ιωάννης, Διευθυντής Ερευνών, Ινστιτούτο Αστρονομίας, Αστροφυσικής, Διαστημικών Εφαρμογών και Τηλεπισκόπησης (ΙΑΑΔΕΤ), Εθνικό Αστεροσκοπείο Αθηνών
Χατζηδημητρίου Δέσποινα, Αναπληρώτρια Καθηγήτρια, Τμήμα Φυσικής, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Original Title:
Coronal properties of Active Galactic Nuclei using a sample of Seyfert I galaxies
Translated title:
Coronal properties of Active Galactic Nuclei using a sample of Seyfert I galaxies
Summary:
Active Galactic Nuclei (AGN) are among the most exotic objects in the Universe and therefore, their study has always been a challenge for the astrophycisists. In this work, we try to investigate the properties of the corona of the AGN; the hot plasma cloud above the accretion disk that it is responsible for the hard X-ray component of the spectrum. To do so, we study a sample of Seyfert I galaxies and derive the properties of their coronae. Next, we investigate the potential correlation between the coronal properties and intrinsic properties of the AGN. Finally, we show a physical mechanism that can be applied to regulate the environment in these plasma clouds and the conclusions we get from our analysis. In chapter I, we present a brief introduction to AGN, illustrating some of the most common types, their differences and then we show the main components an AGN and its role in this complex system. The physical mechanisms that form the shape of the spectrum of an AGN are mostly related to High Energy Astrophysics because the outcome is result of interaction between high energy particles and photons. In chapter II, we discuss the fundamental physics of high energy interactions, like Compton Scattering, Inverse Compton Scattering and Comptonization, and eventually present briefly a Generalized Comptonization theory developed in the 90's. Finally, in chapter III, we present our whole analysis and the results.
Main subject category:
Science
Keywords:
Active Galaxies, Active Galactic Nuclei, AGN, Corona, Seyfert, Comptonization
