MISTERY OBJECT THAT APPROACHING BLACK HOLE AT THE CENTER OF THE MILKY WAY
Astronomers have observed flare (flare) X-ray largest ever detected from a supermassive black hole at the center of the Milky Way. This event, which is detected by the Chandra X-ray Observatory of NASA, raises the question of how our galaxy works.
The supermassive black hole at the center of our galaxy, called Sagittarius A *, or Sgr A *, is estimated to contain about 4.5 million times the mass of our sun. Astronomers made the unexpected discovery when using Chandra to observe how Sgr A * will react to a nearby gas clouds known as G2.
"Unfortunately, the gas cloud G2 does not produce 'fireworks' eperti that we expect to happen when approached by Sgr A *," said lead researcher Daryl Haggard of Amherst College in Massachusetts. "However, the nature often surprise us and we see something else that is really interesting."
On September 14, 2013, Haggard and his team detected X-ray flares from Sgr A * 400 times brighter than normal. 'Megaflare' is almost three times brighter than the light of the previous X-ray flare from Sgr A * in early 2012.
After Sgr A * is quiet, back Chandra X-ray flares observed that another very large, 200 times brighter than usual on October 20, 2014.
Astronomers estimate that the G2 closest to the black hole in the spring of 2014, 15 billion miles away.
Chandra observed flares in September 2013 is about a hundred times closer to the black hole, making it impossible associated with G2.
Researchers have two main theories about what causes Sgr A * erupted in this extreme manner.
The first is that an asteroid comes too close to a supermassive black hole and torn apart by gravity. Debris from the gravitational tidal disturbance as it can be very hot and generates the X-rays before disappearing forever at the point where no one can go back, or event horizon.
"If the asteroid was torn, then the debris would surround a black hole for a few hours - like water channel around the hole before falling," said Fred Baganoff of the Massachusetts Institute of Technology in Cambridge, Massachusetts.
"And the old X-rays generated by these events exactly with the old flare of X-ray light we find the last, so it is an interesting clue for us to consider."
If this theory is valid, it means that astronomers may have found evidence for the largest asteroids that produce X-ray flares observed after torn by Sgr A *.
The second theory is that the lines of the magnetic field in the gas flow towards Sgr A * can be dense and become tangled. These field lines sometimes reconfigure themselves and produce a bright blast of X-rays. Type of magnetic flare is seen in the sun, and flares Sgr A * has the same intensity pattern.
"The point is that astronomers still considering what caused the giant flare from Sgr A *," said co-author Gabriele Ponti from the Max Planck Institute for Astrophysics in Garching, Germany.
'Rare and extreme events like this gives us a unique opportunity to understand the physics of one of the most bizarre objects in our galaxy. "
Source :
versesofuniverse
The X-ray flare ever detected from the black hole Sgr A *
The supermassive black hole at the center of our galaxy, called Sagittarius A *, or Sgr A *, is estimated to contain about 4.5 million times the mass of our sun. Astronomers made the unexpected discovery when using Chandra to observe how Sgr A * will react to a nearby gas clouds known as G2.
"Unfortunately, the gas cloud G2 does not produce 'fireworks' eperti that we expect to happen when approached by Sgr A *," said lead researcher Daryl Haggard of Amherst College in Massachusetts. "However, the nature often surprise us and we see something else that is really interesting."
On September 14, 2013, Haggard and his team detected X-ray flares from Sgr A * 400 times brighter than normal. 'Megaflare' is almost three times brighter than the light of the previous X-ray flare from Sgr A * in early 2012.
After Sgr A * is quiet, back Chandra X-ray flares observed that another very large, 200 times brighter than usual on October 20, 2014.
Astronomers estimate that the G2 closest to the black hole in the spring of 2014, 15 billion miles away.
Chandra observed flares in September 2013 is about a hundred times closer to the black hole, making it impossible associated with G2.
Researchers have two main theories about what causes Sgr A * erupted in this extreme manner.
The first is that an asteroid comes too close to a supermassive black hole and torn apart by gravity. Debris from the gravitational tidal disturbance as it can be very hot and generates the X-rays before disappearing forever at the point where no one can go back, or event horizon.
"If the asteroid was torn, then the debris would surround a black hole for a few hours - like water channel around the hole before falling," said Fred Baganoff of the Massachusetts Institute of Technology in Cambridge, Massachusetts.
"And the old X-rays generated by these events exactly with the old flare of X-ray light we find the last, so it is an interesting clue for us to consider."
If this theory is valid, it means that astronomers may have found evidence for the largest asteroids that produce X-ray flares observed after torn by Sgr A *.
The second theory is that the lines of the magnetic field in the gas flow towards Sgr A * can be dense and become tangled. These field lines sometimes reconfigure themselves and produce a bright blast of X-rays. Type of magnetic flare is seen in the sun, and flares Sgr A * has the same intensity pattern.
"The point is that astronomers still considering what caused the giant flare from Sgr A *," said co-author Gabriele Ponti from the Max Planck Institute for Astrophysics in Garching, Germany.
'Rare and extreme events like this gives us a unique opportunity to understand the physics of one of the most bizarre objects in our galaxy. "
Source :
versesofuniverse
