“Polarimetric study of the UV and X-ray emission regions in supermassive black hole neighbourhood”
This thesis focuses on the reduction and analysis of polarization at high energies (ultraviolet and X-rays) in order to explore the internal geometry of Active Galactic Nuclei. Indeed, the measurement of the polarization of light allows to overcome the limits of spatial resolution since the polarized signal is dictated by the geometry of the emitting regions. To do this, we used observational data from two observatories. First, the ultraviolet polarimeters of the Hubble Space Telescope, for which not all the acquired data have been published. Second, the IXPE satellite, which observed for the first time in X-rays the polarization of supermassive black holes. These polarimetric data, both ultraviolet and X-ray, are reduced and analyzed using new pipelines that allow them to be processed in a homogeneous and standardized way in order to facilitate comparisons, between them but also with other wavelengths