Astrophysical black holes are some of the most extreme and fascinating objects in the universe. However, studying these systems poses difficult challenges since they swallow everything that comes close to them, including light. Fortunately, these objects leave their traces imposing their extreme gravitational pull on the surrounding matter, while it is falling into the black hole. Combining the analysis of X-ray spectral and timing features produced from the innermost region of accreting black holes allows us to characterize the properties of the black hole, such as its mass and spin, and to infer the geometrical structure of the surrounding matter. I will overview the most recent results derived from the spectral-timing analysis of these systems. In particular, I will focus on the results obtained modeling X-ray reverberation features that have been observed in both supermassive and stellar-mass accreting black holes and on the open questions that we are still facing.

Breve CV del Dr. Guglielmo Mastroserio:
He is currently a postdoc at the Osservatorio Astronomico di Cagliari - INAF. He studied physics at the University of Milan and did his thesis in collaboration with the Osservatiorio Astronomico di Brera-Merate. He then moved to the University of Amsterdam where he obtained his PhD working on modeling spectral-timing features of accreting black holes. Before joining Matteo Bachetti group at the Osservatorio Astronomico di Cagliari, he spent three years at Caltech as a postdoc in the group responsible for the X-ray telescope NuSTAR.