Black holes are bizarre things, even by the standards of astronomers.
But we have lots of questions about their actual feeding behavior. We know material on its way into the hole spirals into a glowing"accretion disc" that can be bright enough to outshine entire galaxies. These visibly feeding black holes are called quasars.
These whole-sky scans also happen to provide a nightly record of the glow of hungry black holes, deep in the background. Our team put together a five-year movie of each of those black holes, showing the day-to-day changes in brightness caused by the bubbling and boiling glowing maelstrom of the accretion disc.In 1998, astrophysicists Steven Balbus and John Hawley proposed a theory of"" that describes how magnetic fields can cause turbulence in the discs.
But when we sorted them by size, brightness, and color, we began to see intriguing patterns. We were able to determine the orbital speed of each disc – and once you set your clock to run at the disc's speed, all the flickering patterns started to look the same.That was comforting! It means these mind-boggling maelstroms are"simple" after all.
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