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The Very Hungry Supermassive Black Hole

29 Jul 2015, 11:04 UTC
The Very Hungry Supermassive Black Hole
(200 words excerpt, click title or image to see full post)

We all get the munchies, but when you’re a supermassive black hole (SMBH) your hunger might have dire consequences. And just like that an SMBH has outgrown its galaxy and jumped to the top of the heavyweight objects in the universe.
“Artistic Impression” by Digital Welshman
About 12 billion light years from us, there is a galaxy called CID-947. It has a mass similar to our own Milky Way (about 1000 billion times the mass of the Sun) and it was only remarkable because it had an active galactic nucleus (AGN, i.e. an accreting SMBH). When material starts to fall into an SMBH, the accretion disk of infalling material and the relativistic jet of excited particles that are pushed away from the black hole generates and excess of light, in most if not all wavelengths. A usual signature of the presence of AGNs is a large amount of x-rays. That’s how CID-947 was found.
But when the team lead by Benny Trakhtenbrot estimated the mass of the SMBH, they found something unexpected. Usually, an SMBH holds about 0.5% of the mass of its host galaxy. Sagittarius A*, our friendly neighbourhood SMBH is 4 million solar masses, making the Milky Way ...

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