Our galaxy's black hole to swallow giant gas cloud

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Our galaxy's black hole to swallow giant gas cloud

#1  Postby Blip » Jan 10, 2014 1:44 pm

'Astronomers are getting ready for their best ever glimpse of the mysterious black hole at the heart of our galaxy.

'"Fireworks" will flare if it gobbles up a giant gas cloud which is drifting perilously close.

'A collision is now likely in spring, according to scientists at the American Astronomical Society meeting.'

More here.
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Re: Our galaxy's black hole to swallow giant gas cloud

#2  Postby DougC » Jan 10, 2014 4:13 pm

:popcorn:
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Re: Our galaxy's black hole to swallow giant gas cloud

#3  Postby DavidMcC » Jan 10, 2014 5:14 pm

This subject was in the news last August, and the result was already looking disappointing:
http://www.universetoday.com/104423/our-galaxys-supermassive-black-hole-is-a-sloppy-eater/
Like most galaxies, our Milky Way has a dark monster in its middle: an enormous black hole with the mass of 4 million Suns inexorably dragging in anything that comes near. But even at this scale, a supermassive black hole like Sgr A* doesn’t actually consume everything that it gets its gravitational claws on — thanks to the Chandra X-ray Observatory, we now know that our SMB is a sloppy eater and most of the material it pulls in gets spit right back out into space.
(Perhaps it should be called the Cookie Monster in the middle.*)
New Chandra images of supermassive black hole Sagittarius A*, located about 26,000 light-years from Earth, indicate that less than 1% of the gas initially within its gravitational grasp ever reaches the event horizon. Instead, much of the gas is ejected before it gets near the event horizon and has a chance to brighten in x-ray emissions.
The new findings are the result of one of the longest campaigns ever performed with Chandra, with observations made over 5 weeks’ time in 2012.
...
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Re: Our galaxy's black hole to swallow giant gas cloud

#4  Postby newolder » Jul 26, 2018 2:10 pm

One of the nearest stars to the Milky Way's central SMBH, called S2, bolsters General Relativity theory as it whizzes along its closest approach at 25 million kilometres an hour...
Image
Obscured by thick clouds of absorbing dust, the closest supermassive black hole to the Earth lies 26 000 light-years away at the centre of the Milky Way. This gravitational monster, which has a mass four million times that of the Sun, is surrounded by a small group of stars orbiting around it at high speed. This extreme environment — the strongest gravitational field in our galaxy — makes it the perfect place to explore gravitational physics, and particularly to test Einstein’s general theory of relativity.
...
The team compared the position and velocity measurements from GRAVITY and SINFONI respectively, along with previous observations of S2 using other instruments, with the predictions of Newtonian gravity, general relativity and other theories of gravity. The new results are inconsistent with Newtonian predictions and in excellent agreement with the predictions of general relativity.

...more at link below...

ESO link
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Re: Our galaxy's black hole to swallow giant gas cloud

#5  Postby newolder » Feb 06, 2020 4:59 pm

An updated animation based upon observations of the central parsec of the Milky Way galaxy up to 2019 is available on the Animations page at the UCLA Galactic Centre Group website

... Especially important is the star S0-2 as it has has been observed for more than one full orbital period, which is only 16.17 years.


Sample frame

Image
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