TY - JOUR AU - Ramesh Narayan AU - Daniel Palumbo AU - Michael Johnson AU - Jason Dexter AU - et al. BT - The Astrophysical Journal DA - 2021-05 DO - 10.3847/1538-4357/abf117 PY - 2021 EP - 35 T2 - The Astrophysical Journal TI - The Polarized Image of a Synchrotron-emitting Ring of Gas Orbiting a Black Hole VL - 912 ER -