Active Galactic Nuclei at hard X-ray energies: absorption, reflection and the unified model

Diplôme Thèse Active Galactic Nuclei at hard X-ray energies: absorption, reflection and the unified model eng 2011-12-08 author Ricci Claudio 636804 director Courvoisier Thierry 22894 10.13097/archive-ouverte/unige:19474 urn:nbn:ch:unige-194749 Sc. 4386 Active Galactic Nuclei (AGN) are the most luminous persistent sources in the Universe, and are believed to be powered by accretion onto supermassive black holes. My work is mainly focused on the study of X-ray spectra of AGN, with particular attention to the unification scenarios. AGN are classified according to their optical spectra, and different types of AGN are thought to be intrinsically the same object, just observed from different lines of sight with respect to a molecular torus. In this work, differences between different classes of AGN, unforeseen by the unification model, are found. These differences appear to be due to a larger reflection component in the spectra of more obscured objects, which could be related to the latter having on average more material around than the former. Active Galactic Nuclei AGN X-rays Astrophysics Black Holes CXB Seyfert INTEGRAL XMM-Newton Suzaku Chandra Swift Astronomie Rayons X Noyaux Actif de Galaxie Dewey 520 26 Département d'astronomie 12 false ec301d57-4214-4793-839b-776d3e2c08b7 Thesis Public Thesis_Claudio_Ricci.pdf 11085495 application/pdf openAccess Faculté des sciences / Département d'astronomie

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Ricci, Claudio