RX J1131-1231 is a distant, supermassive-black-hole-containing quasar located about 6 billion light years from Earth in the constellation Crater.

[1][2] In 2014, astronomers found that the X-rays being emitted are coming from a region inside the accretion disk located about three times the radius of the event horizon.

[3] This determination was made by a team led by Rubens Reis of the University of Michigan using NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton telescopes.

The team observed the X-rays generated in the innermost regions of the disk circling and feeding the black hole that powers the quasar.

The rapid spin of the quasar indicates that the black hole is being fed by a vast supply of gas and dust.