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Past Events
Public Seminar of RPg Student:
Probing the wind and funnel formed in super-Eddington accretion using X-ray reverberation
| Speaker: | Mr. Zijian ZHANG |
| Affiliation: | The University of Hong Kong |
| Date: | February 8, 2023 (Wednesday) |
| Time: | 2:00 p.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, The University of Hong Kong |
Abstract
The Fe K-alpha line generated on the black hole accretion disk is skewed due to the gravitational field and disk rotation and has been used to measure the black hole spin. State-of-the-art numerical simulations have shown the existence of a geometrically thick accretion system when the accretion rate is high. The so-called super-Eddington system can form a funnel-shaped wind. The Fe K-alpha can be reflected in the funnel and physical interactions which can change the energy of the photon happen during the reflection. Therefore, the spectrum has a different shape in this super-Eddington system. We ran a series of simulations to show the prospect of using the Fe K-alpha line to probe the wind velocity and funnel geometry. The package that includes the simulated spectra will be developed for the standard astronomical software. The temporal feature of the Fe K-alpha spectrum will also be analyzed.
Anyone interested is welcome to attend.