Date: Wednesday 18-Sep-2024
Time: 11:30-12:30 pm
Location: PSC 1136
Speaker: Niek Bollemeijer (University of Amsterdam)
Title: Revealing disk-corona connections on short timescales
Abstract: Black hole X-ray binaries in outburst can be very bright sources of X-rays, which are emitted mainly in two spectral components. The accretion disk dominates emission at low energies, while high energy X-rays originate from a region close to the black hole known as the corona. Despite decades of research, the nature and geometry of the corona is still subject to debate. The X-ray flux of accreting black holes has been observed to be highly variable on a broad range of timescales. The study of that variability is called X-ray spectral-timing and it can constrain models of the corona. Observations by X-ray telescopes NICER and Insight-HXMT, which cover the full X-ray band together, provide an unprecedented view of the complex variability. I will show how combining data from both telescopes leads to surprising connections between the lowest and highest X-ray energies and discuss what they may imply for the nature of the corona.
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