Light bending and X-ray echoes from behind a supermassive black hole.

  title={Light bending and X-ray echoes from behind a supermassive black hole.},
  author={Dan R Wilkins and Luigi C. Gallo and E. Costantini and William N. Brandt and R. Blandford},
  volume={595 7869},
The innermost regions of accretion disks around black holes are strongly irradiated by X-rays that are emitted from a highly variable, compact corona, in the immediate vicinity of the black hole1-3. The X-rays that are seen reflected from the disk4, and the time delays, as variations in the X-ray emission echo or 'reverberate' off the disk5,6, provide a view of the environment just outside the event horizon. I Zwicky 1 (I Zw 1) is a nearby narrow-line Seyfert 1 galaxy7,8. Previous studies of… 
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