Milky Way's Supermassive Black Hole a Million Times Brighter 300 Years Ago (Today's Most Popular)

 

          

Astronomers have long wondered why it is that the super-massive black hole in the center of our galaxy,  known as Sagittarius A*, containing about 4 million times the mass of our Sun is relatively quiet. Despite its size, the energy radiated from its surroundings is billions of times weaker than black holes at the core of other galaxies. In fact, it was a million times brighter three centuries ago when must have unleashed an incredibly powerful flare.

The center of our Milky Way is surprisingly difficult to observe from our location, hidden about 24,000 light years away behind enormously thick clouds of gas and dust within the Galactic disk. But todays super observatories powerful telescopes can reveal all its secrets. 

The image above is a color-coded overlay of an infrared image (in red) of the center of the Milky Way obtained by the Spitzer Space Telescope, an optical image (in yellow) from Hubble, and an X-ray image (in blue) from Chandra which highlights the bright white patch on the lower right where our own supermassive black hole resides.

"We have wondered why the Milky Way’s black hole appears to be a slumbering giant," says Tatsuya Inui of Kyoto University in Japan. "But now we realize that the black hole was far more active in the past. Perhaps it’s just resting after a major outburst."

Tatsuya Inui is part of a team that used results from Japan’s Suzaku and ASCA X-ray satellites, NASA’s Chandra X-ray Observatory, and the European Space Agency’s XMM-Newton X-ray Observatory, to determine the history of our black hole.

It turns out that, approximately 300 years ago, Sagittarius A* let loose, expelling a massive energy flare.
Data taken from 1994 to 2005 revealed that clouds of gas near the central black hole, known as Sagittarius B2, brightened and faded quickly in X-ray light. The X-rays were emanating from just outside the black hole, created by the buildup of matter piling up outside the black hole, which subsequently heats up and expels X-rays.

Amazingly for us, in a rare occurrence of perfect cosmic timing, a region in Sagittarius B2, only 10 light-years across varied dramatically in brightness. 

"By observing how this cloud lit up and faded over 10 years, we could trace back the black hole’s activity 300 years ago," said Katsuji Koyama of Kyoto University.

The Daily Galaxy via NASA's High Energy Astrophysics Science Archive Research Center and
eurekalert.org

Image Credit: Credit: X-ray: NASA/CXC/UMass/D. Wang et al.; Optical: NASA/ESA/STScI/D.Wang et al.; IR: NASA/JPL-Caltech/SSC/S.Stolovy

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Comments

[Raj]

The answer is aliens are manipulating the black hole to derive energy from it. Yep.

[Ivar Nielsen]

Read also:

http://www.dailygalaxy.com/my_weblog/2012/05/milky-way-sized-supermassive-black-hole-observed-flaring-up-.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheDailyGalaxyNewsFromPlanetEarthBeyond+%28The+Daily+Galaxy+--Great+Discoveries+Channel%3A+Sci%2C+Space%2C+Tech.%29

Ivar Nielsen
Natural Philosopher

[Kt]

How can a black hole be bright? Or is it just constantly repelling matter which gives it an appearance of brightness? I thought black holes were too heav to give off light.

[Ricky]

@kT: Gas and dust falling into a black hole form a pancake shaped structure as they rotate and spin into position for getting sucked down the black hole, sort of a cross between Saturn's ring and your bathtub drain. Friction between the atoms and dust particles heats them up to a fantastic temperature and they glow in X-rays just outside the surface of no return above the black hole - effectively, giving off a flash of intense light as they "go in". This flash can bounce off of nearby dust clouds, just like lightning in a cloud on Earth can light up the entire cloud. The extra time to bounce off a nearby cloud (300 years in this case) gets added to the 23,000 years the light takes to get to Earth. So even tho we missed the direct flash, we see the reflection of it off of a nearby cloud - and that reflection is a glimpse of something that happened 300 years earlier.

[Holo]

the flare ups have nothing to do with a phony black hole at the center of the galaxy. Plasma dynamics of birkeland current filament pinches emit all the phenomena in plasma labs, and explains outer space, and the galaxy rotation curve paradigm

[Ruth Mc]

Could you say that in English now, please?

[smartypants]

Ruth, this may help.
http://www.thunderbolts.info/thunderblogs/archives/solar08/062308_milky_way_birkeland_current.htm

[Ruth Mc]

Thanks, I think... Wow I only just recovered from finding out about the Schwarzschild Radius and now I've gotto teach myself about birkeland currents.. I love it!