First M87 Event Horizon Telescope results: VII. Polarization of the ring

PolarimetryRadio interferometryVery long baseline interferometrySupermassive black holesActive galactic nucleiLow-luminosity active galactic nucleiAstronomy data modelingGalaxy accretion disksGalaxies: individual: M87, 1278, 1346, 1769, 1663, 16, 2033, 1859, 562Astrophysics - high energy astrophysical phenomenaAstrophysics - astrophysics of galaxies