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ASTROPHYSICAL UNIVERSE: Secret Internal Lives of Galaxies | High Sierra Backpacker

ASTROPHYSICAL UNIVERSE: Secret Internal Lives of Galaxies


Alex Wierbinski's picture

By Alex Wierbinski - Posted on 24 April 2018

 

ASTROPHYSICAL UNIVERSE

Secret Internal Lives of Galaxies

Hidden Families of Supermassive Black Holes in Galaxies?

Milky Way's supermassive black hole may have 'unseen' siblings,
Yale University, April 24, 2018.

"Typically, a supermassive black hole (SMBH) exists at the core of a massive galaxy. But sometimes SMBHs may "wander" throughout their host galaxy, remaining far from the center in regions such as the stellar halo, a nearly spherical area of stars and gas that surrounds the main section of the galaxy."

"Astronomers theorize that this phenomenon often occurs as a result of mergers between galaxies in an expanding universe. A smaller galaxy will join with a larger, main galaxy, depositing its own, central SMBH onto a wide orbit within the new host."

"We estimate that a close approach of one of these wanderers that is able to affect our solar system should occur every 100 billion years or so, or nearly 10 times the age of the universe."

"...since wandering SMBHs are predicted to exist far from the centers of galaxies and outside of galactic disks, they are unlikely to accrete more gas -- making them effectively invisible. "We are currently working to better quantify how we might be able to infer their presence indirectly,"

 

 

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