Astronomy Colloquium

Wednesday, May 18, 2022
4:00pm to 5:00pm
Add to Cal
Online Event
Event Horizon Telescope Imaging of Sagittarius A*
Geoff Bower, Research Astronomer, ASIAA,

We present the first image of the Galactic Center black hole, Sgr A*, obtained with the Event Horizon Telescope.  The image has an angular diameter of 52 microarcseconds, consistent with predictions of general relativity and the Kerr metric.  Comparison with an unprecedented library of GRMHD simulations places strong constraints on the accretion and outflow properties.  The result confirms that the gravitational lensing feature observed first in M87 is a universal property of black holes, establishes the consistency of general relativity over three orders of magnitude in mass, and opens the door for future tests of gravity, accretion, and jet formation.

To view this talk via YouTube, please visit: https://www.youtube.com/playlist?list=PLb1880Rn0qkKzIavl-n_7RaMyDOiU9XHm

For more information, please contact Jim Fuller by email at jfuller@caltech.edu or visit http://www.astro.caltech.edu.