Image Credit: NASA/CXC/NGST

NASA’S Chandra Suggests Rare Explosion Created Our Galaxy’s Youngest Black Hole

By News Release

WASHINGTON — New data from NASA’s Chandra X-ray Observatory suggest a highly distorted supernova remnant may contain the most recent black hole formed in the Milky Way galaxy. The remnant appears to be the product of a rare explosion in which matter is ejected at high speeds along the poles of a rotating star.

The remnant, called W49B, is about a thousand years old as seen from Earth and located about 26,000 light-years away. “W49B is the first of its kind to be discovered in the galaxy,” said Laura Lopez, who led the study at the Massachusetts Institute of Technology. “It appears its parent star ended its life in a way that most others don’t.”

Usually when a massive star runs out of fuel, the central region of the star collapses, triggering a chain of events that quickly culminate in a supernova explosion. Most of these explosions are generally symmetrical, with the stellar material blasting away more
or less evenly in all directions.

However, in the W49B supernova, material near the poles of the doomed rotating star was ejected at a much higher speed than material emanating from its equator. Jets shooting away from the star’s poles mainly shaped the supernova explosion and its aftermath.

The remnant now glows brightly in X-rays and other wavelengths, offering the evidence for a peculiar explosion. By tracing the distribution and amounts of different elements in the stellar debris field, researchers were able to compare the Chandra data to theoretical models of how a star explodes. For example, they found iron in only half of the remnant, while other elements such as sulfur and silicon were spread throughout. This matches predictions for an asymmetric explosion.

“In addition to its unusual signature of elements, W49B also is much more elongated and elliptical than most other remnants,” said co-author Enrico Ramirez-Ruiz of the University of California at Santa Cruz. “This is seen in X-rays and several other wavelengths and points to an unusual demise for this star.”

Read more: NASA’S Chandra Suggests Rare Explosion Created Our Galaxy’s Youngest Black Hole « AmericaSpace.

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