An X-ray Surprise! When Black Holes Stop Eating, Galaxies Fade Away (Synopsis) [Starts With a Bang]
“I’ll never, ever be full. I’ll always be hungry. Obviously, I’m not talking about food.” -Dwayne ‘The Rock’ Johnson
Only a very small percentage of galaxies have active supermassive black holes. While the black holes themselves are common, they only rarely feed, gaining a huge influx of matter to accelerate and send jets and other emission out. When a galaxy does become active, they can appear in any number of interesting manifestations, dependent on their orientation relative to us.
The unified model of AGNs/Active Galactic Nuclei. Image credit: Robert Antonucci, aka Ski, of http://web.physics.ucsb.edu/~ski/skipicture-1.html.
But most galaxies, on human timescales, will either appear permanently off or on. A galaxy can turn on from a merger, accretion or just a chance encounter with a star cluster or gas cloud, but for the first time, we’ve seen one turn on and then off in great detail. As it turns out, the X-ray emissions are key to watching the feeding stop, and seeing the galaxy fade as a result.
The bright emissions extending past the edge of the galaxies are evidence of prior AGN activity, but the central black holes are too dim now. Image credit: NASA / ESA / W. Keel, University of Alabama.
Come get the amazing story in pictures, video and 200 words, top, on today’s Mostly Mute Monday!
Source: http://scienceblogs.com/startswithabang/2016/12/05/an-x-ray-surprise-when-black-holes-stop-eating-galaxies-fade-away-synopsis/
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