The Event Horizon Telescope (EHT) has recently made the first resolved images of a supermassive black hole, that at the center of the M87 galaxy.  To compare with these observations, theorists perform general relativistic magnetohydrodynamic (GRMHD) simulations, followed by general relativistic radiative transfer (GRRT) to make model images.  I joined the EHT collaboration in 2020, and have been involved in theoretical interpretation.  At the time of writing, we're working on Sgr A*, polarization, and time variability.


I recently performed a study of Faraday rotation in models of M87's black hole.  This video is a model of M87's black hole, color-coded by rotation measure (RM), an observable which traces Faraday rotation.  We found significant time variability and spatial non-uniformity, motivating continued monitoring of this source!