AT2018hyz is a tidal disruption event (TDE) that was discovered in 2018 by the All Sky Automated Survey for SuperNovae (ASASS-SN).
[1] In 2022, astronomers announced the discovery of radio emission from AT2018hyz using the Very Large Array (VLA), MeerKAT, and the Australia Telescope Compact Array (ATCA), despite no radio emission detected earlier.
[2] The emission is still rising rapidly, and has been interpreted as an outflow of material that was "burped" several years after the initial TDE from the accretion disk of the supermassive black hole, traveling at up to half the speed of light.
[3] Alternately, it has been proposed that the delayed radio emission from AT2018hyz could be due to an off-axis astrophysical jet, which launched promptly when the black hole was consumed (similar to the TDE Swift J1644+57), and emission only became visible later when it entered our line of sight.
[6] Based on studies, the host galaxy's redshift has a g-band visual magnitude of -20.2, with the galaxy containing a low-mass black hole measuring 106 M⊙.