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Wednesday, 5 October 2022, 14:30 in P8445B
Prof. Chi-kwan Chan (Steward Observatory, U. of Arizona)
Resolving the galactic center black hole with the Event Horizon Telescope
In 2017, the Event Horizon Telescope (EHT) observed the Galactic Center supermassive black hole Sagittarius A* (Sgr A*) using a global interferometric array of 8 telescopes. The resulting horizon scale images provide a unique opportunity to constrain the astrophysics of the accreting plasma and to test Einstein's general theory of relativity in a strong field regime. In this talk, I will introduce the EHT project and go over its data processing pathway and imaging methods. By comparing EHT's images with a large black hole simulation library, we constrain the properties of the accretion flow around Sgr A*. By comparing the size of the observed photon ring with the predicted size of the shadow, we show that EHT's observations are consistent with the general relativity.
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Modified by Andrei Frolov <frolov@sfu.ca> on 2023-11-01