How black-hole-powered quasars killed off neighboring galaxies in the early universe - Space.com

How black-hole-powered quasars killed off neighboring galaxies in the early universe  Space.comObservations confirm that early-universe quasar neighborhoods are densely populated with companion galaxies  Phys.orgDark Energy Camera Uncovers Mysteries of Quasar Neighborhoods in The Early Universe  The Daily Galaxy --Great Discoveries ChannelArtist Illustration of Early-Universe Quasar Cosmic Neighborhood (IMAGE)  EurekAlertDECam Study Reveals Dense Galactic Clusters Around Early Universe Quasars  Space Daily