Event Horizon Telescope

May 21, 2019 - 12:15 pm to 1:15 pm

Campus, PAB 232

Warren Morningstar

The Event Horizon Telescope is a network of roughly ten telescopes spanning nearly the entire earth.  By operating the telescope as an interferometer, the EHT is able to image with roughly ten microarcsecond resolution.  This puts it in a position to view the event horizons of two black holes, Messier 87, and Sagitarius A*, the black hole in the center of our own galaxy.  But they do not just take a simple photograph of the event horizon with a big camera.  Oh no, the EHT took a large team of researchers years to process and analyze massive volumes of complex data obtained from all over the world, and even then they had to rely on multiple image reconstruction techniques to create anything that you or I would call an image.  The result of all of this painstaking work is the recently presented first image of the shadow of a black hole.  In this talk, I'll present details of how their measurements are made, along with the methods used in producing this amazing image.