My research is focussed on the study of the most luminous persistent sources of radiation in the Universe: Active Galactic Nuclei (AGN). AGN are powered by accretion onto a supermassive black hole typically located at the center of galaxies. In the last decades it has become evident that probably most galaxies have gone through an AGN phase, which might have played a crucial role in their formation and evolution.
My work is aimed at constraining the structure and evolution of the material surrounding supermassive black holes. To do so I mostly use X-ray and multi-wavelength observations (optical and IR in particular). X-rays are a great tool to study the inner regions of supermassive black holes, since they are produced very close to the central engine. Studying the emission absorbed and reprocessed by the circumnuclear material it is possible to shed light on the structure and evolution of the environment of supermassive black holes.
I recently joined the NuSTAR collaboration. NuSTAR is a NASA-led astronomical satellite with the first focussing hard X-ray telescope in-orbit. I am currently working on several projects within the collaboration. I recently led a paper based on the results obtained by five NuSTAR observations of IC 751, which showed a clear variation of the absorbing material with time, with the source switching from being Compton-thin to Compton thick in a few months. This is the first 'Changing-look' AGN discovered by NuSTAR.