The Milky Way's Supermassive Black Hole had a Burst of Activity 200 Years Ago. We Just Saw the Echo. - by spacewriter
Tracking the Glow of a Supermassive Black Hole Snack
The team combined their data with images from the Chandra X-Ray Observatory and compared them to data from the XMM-Newton mission. That helped them really pinpoint the origin of the emissions brightening the nearby clouds. Basically, when the black hole accretion disk gobbled up nearby material, there resulting X-ray emissions were more than a million times greater than usual. That made it as luminous as an active galactic nucleus in a Seyfert galaxy.
This snacking happens fairly often, but usually, the flares are very short-lived—some on the order of only minutes. Those may take place in very small regions of the accretion disk. But some, like the one 200 years ago, are longer and brighter. For that event, the cloud of material that got sucked into the accretion disk must have been fairly large to trigger the brilliant, long-term blast of X-rays.
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