July 6, 2019

Ancient quasars spin at relativistic speeds

An article published in “The Astrophysical Journal” reports an observation of 5 quasars between 9.8 and 10.9 billion light years away from Earth with the help of gravitational lenses that offered multiple images of them. A team of astronomers used NASA’s Chandra X-ray Observatory to study the accretion disks around the supermassive black holes that power those quasars, discovering that one of them spins at a speed higher than 70% of the speed of light.