Astronomers detected a gamma-ray burst GRB221009A with an energy of up to 18 teraelectronvolts near Earth on October 9.
The newly discovered gamma-ray burst is called GRB221009A. was the most powerful ever observed, releasing 18 teraelectronvolts of energy. Scientists are still analyzing the results of the measurements, but if the results are confirmedthis will be the first gamma-ray burst with an energy greater than 10 teraelectronvolts. GRB221009A comes from management Sagittarius constellation and can be observed with a telescope for more than 10 hours, among the longest gamma-ray bursts ever recorded.
Gamma flashes carry the most powerful energy in the universe.
Gamma flashes carry the most powerful energy in the universe. (Photo: NASA/ESA)
Gamma flashes were accidentally discovered by US military satellites in the 1960s, probably created when giant stars explode at the end of their lives before collapsing into black holes, or when ultra-dense stellar bodies called stars at colliding neutrons. In just a few seconds, these explosions release energy equivalent to that emitted by the Sun during its 10 billion year lifespan.
At first, the strength of the gamma-ray flashes confused astronomers. They believe it must have been created by a relatively close source. Initially, they also thought the energy came from x-rays rather than gamma rays. Subsequent analysis of the signal confirms the fact it was a gamma-ray burst from a source 2.4 billion light years away. Although not too close, this gamma-ray burst remains the closest ever observed.
Although located a safe distance from Earth, gamma rays could cause disasters if they were closer. Within a radius of several thousand light years from Earth, such gamma flashes could cause the planet to lose its protective ozone layer and cause a mass extinction. Researchers believe that one of the largest extinction events in Earth’s history, during the Ordovician period 450 million years ago, may have been caused by gamma rays, according to the NASA.
Although GRB221009A is 20 times closer to Earth than a typical gamma-ray burst, it doesn’t worry astronomers. “This event was very close and high energy, meaning that the radio, optical, X-ray and gamma light it produced was extremely bright and easy to observe. So we were able to study the flash of this gamma ray with many large and small telescopes around the world, collecting all the data as it flashed and then disappeared.said Gemma Anderson, an astronomer at Curtin University, Australia.
According to the researchers, GRB221009A appears to be a long gamma burst but they do not know the reason for his birth. Many telescopes on the ground and in Earth orbit point toward the galaxy where the gamma-ray burst appeared. These devices will seek to observe the light created by the explosion at as many wavelengths as possible to determine its origin. The first results of the observation were published on October 9 in the journal Astronomer’s Telegram.
Article source: VnExpress
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Astronomers detected a gamma-ray burst GRB221009A with an energy of up to 18 teraelectronvolts near Earth on October 9. This is the most powerful coherent gamma-ray burst…