The Milky Way has a supermassive black hole: confirmed!

The Milky Way has a supermassive black hole: confirmed!

Postby Nutso » Thu Nov 01, 2018 10:04 pm

http://www.astronomy.com/news/2018/10/s ... black-hole

For a long time, scientists have assumed that a supermassive black hole exists at the heart of our galaxy and most other galaxies. But these observations mark the first time scientists can confirm their long-held theory.

Researchers used the European Southern Observatory’s sensitive GRAVITY instrument on the Very Large Telescope (VLT) to observe infrared radiation flares coming from the accretion disc around Sagittarius A* — the massive object at the center of our galaxy. Scientists think that most galaxies have a supermassive black hole at their center, but they’d never before had the data and observations to prove it.

To measure the effects of gravity near to a black hole, scientists needed to observe an object actually traveling close to it. They found their mark in a small star called S2 whose orbit takes it deep within Sagittarius A*’s gravity well every 16 years. As they watched, they saw three bright flares traveling around the black hole’s event horizon at about 30 percent of the speed of light — around 216 million miles per hour.

It’s exactly what Einstein’s theory of general relativity predicts would occur when a hot spot (like S2) passes close to a black hole weighing as much as 4 million suns, and the observation helps to confirm that it’s really there.

“We were closely monitoring S2, and of course we always keep an eye on Sagittarius A*. During our observations, we were lucky enough to notice three bright flares from around the black hole — it was a lucky coincidence!” Oliver Pfuhl, a scientist at the Max Planck Institute for Extraterrestrial Physics (MPE) in Garching, Germany, said in a statement.
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Re: The Milky Way has a supermassive black hole: confirmed!

Postby Mikey » Fri Nov 02, 2018 2:17 pm

Teaos wrote:I though this was confirmed 20+ years ago?

AFAIK, it was hypothesized - and later theorized - but not proven.
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Re: The Milky Way has a supermassive black hole: confirmed!

Postby Teaos » Sun Nov 04, 2018 7:34 am

What’s enough to confirm it. I remember well over ten years ago them tracing a star that got flung out of the core, it could only have been done by something with the properties of a SMBH.
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