Simon Fraser University
SFU Cosmology Seminars

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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.

Zoom: connect here

Seminars in 2022:

2022-10-04 11:00 in Zoom - Chad Briddon (Nottingham): Using SELCIE to investigate screened scalar field models sourced by complex systems
2022-10-05 14:30 in P8445B - Chi-kwan Chan (Steward Observatory, U. of Arizona): Resolving the galactic center black hole with the Event Horizon Telescope
2022-10-25 14:00 in P8445A - Victor Pozsgay (Imperial College, London): Low-energy EFT causality bounds
2022-11-08 11:00 in P8445A - Daniel Jiménez Aguilar (University of the Basque Country): The dynamics of domain wall strings
2023-01-24 14:00 in P8445A - Bartolomeo Fiorini (Queen Mary): Studying large-scale structure probes of modified gravity with COLA
2023-01-25 13:00 in P8445A - Rajendra Gupta (Ottawa): Do fundamental constants vary on cosmological time scale?
2023-04-11 17:00 in Zoom - Shinji Mukohyama (Kyoto): Effective field theory of black hole perturbations with timelike scalar profile
2023-05-09 11:30 in Zoom - José Tomás Gálvez Ghersi (Universidad de Ingeniería y Tecnología, Peru): Dimensional deformation of sine-Gordon breathers into oscillons

[ See complete seminar archives | iCal feed ]

Modified by Andrei Frolov <frolov@sfu.ca> on 2023-11-01