What structure is formed when fuel falls into M31's black hole, heating up and emitting detectable radiation?

Answer

An accretion disk

When material falls into the black hole, it forms an accretion disk, which heats up and emits radiation, particularly in the X-ray spectrum.

What structure is formed when fuel falls into M31's black hole, heating up and emitting detectable radiation?
SpaceAndromedagalaxyblack hole