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Accretion onto black holes is a fundamental process in the Universe. It is an efficient engine to produce strong radiation and energetic outflows. The X-rays from these systems serve as a powerful tool to study the accretion physics and the central black hole. In this talk, I will discuss how we can use the X-ray reflection component, namely the reprocessed emission by the optically thick accretion disk, to measure black hole spins, understand the evolution of the accretion geometry during outbursts of X-ray binaries and study the microphysics of the accretion flow. Outflows driven by the accretion process will also be briefly discussed. In the end, I will discuss open questions regarding current reflection models and outline future research plans.
Honghui Liu received his Bachelor degree from Fudan University in 2019 and has since continued his Ph.D study in Fudan in the group of Prof. Cosimo Bambi. He is supposed to get the Ph.D degree in the summer of 2024. His research interests are on studying the environment of accreting black holes with X-ray observations. The topics he has worked on include X-ray reflection spectroscopy, outflows in accreting systems, low frequency quasi-periodic oscillations and spectro-polarimetric analysis. Until now, he has published 9 papers as the first author on journals like ApJ, MNRAS or PRD.